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RECIENTES OBSERVACIONES VISUALES & CCD / RECENT COMET OBSERVATIONS
(actualizada al 20 de Septiembre de 2019 / Update 2019, September 20 – comet.observations [AT] gmail.com – cometas.liada [AT] gmail.com)

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Update:
C/2019 K5 (Young) COHP, P/2019 G1 (PANSTARRS) COHP, C/2019 F1 (ATLAS-Africano) COHP, *C/2019 D1 (Flewelling) COHP, *C/2019 A9 (PANSTARRS) COHP, C/2018 Y1 (Iwamoto) COHP, *C/2018 W2 (Africano) COHP, C/2018 W1 (Catalina) COHP, C/2018 V1  (Machholz-Fujikawa-Iwamoto) COHP, C/2018 R3 (Lemmon) COHP, *C/2018 N2 (ASASSN) COHP, C/2018 N1 (NEOWISE) COHP, C/2018 L2 (ATLAS) COHP, C/2018 EF9 (Lemmon) COHP, C/2018 С2 (Lemmon) COHP, *C/2018 A6 (Gibbs) COHP,  *C/2018 A3 (ATLAS) COHP, P/2017 U6 (PANSTARRS) COHP, C/2017 T3 (ATLAS) COHP, *C/2017 T2 (PANSTARRS) COHP, C/2017 T1 (Heinze) COHP, C/2017 S3 (PANSTARRS) desintegrated COHP, C/2017 O1 (ASASSN) COHP, C/2017 M4 (ATLAS) COHP, C/2017 K6 (Jacques) COHP, *C/2017 B3 (LINEAR) COHP, C/2016 R2 PANSTARRS COHP, C/2016 N6 (PANSTARRS) COHP, C/2016 N4 (MASTER) COHP, C/2016 M1 (PANSTARRS) COHP, C/2016 B1 (NEOWISE) COHP, C/2015 VL62 Lemmon-Yeung-PANSTARRS COHP, C/2015 V2 (Johnson) COHP, C/2015 V1 (PANSTARRS) COHP, C/ 2015 O1 (PANSTARRS) COHP, C/2015 ER61 (PANSTARRS) COHP, C/2014 B1 (Schwarz) COHP, C/2010 U3 (Boattini) COHP, (3200) Phaethon COHP, (944) Hidalgo COHP, 368P/NEAT COHP, 364P/PANSTARRS COHP, *260P/McNaught COHP, 240P/NEAT COHP, 231P/LINEAR-NEAT COHP, 217P/LINEAR COHP, 213P/Van Ness COHP, 185P/Petriew COHP, 174P/Echeclus COHP,
159P/LONEOS COD, 137P/Shoemaker-Levy 2 COHP, 123P/West-Hartley COHP, 90P/Gehrels COHP, 78P/Gehrels 2 COHP, 74P/Smirnova-Chernykh COHP, 71P/Clark COHP, *68P/Klemola COHP, 66P/Du Toit COHP, 65P/Gunn COHP, 64P/Swift-Gehrels COHP, 62P/Tsuchinshan 1 COHP, 60P/Tsuchinshan 2 COHP, 49P/Arend-Rigaux COHP, 48P/Johnson COHP, 46P/Wirtanen COHP, 41P/Tuttle-Giacobini-Kresak COHP, 38P/Stephan-Oterma COHP, 37P/Forbes COHP, *29P/Schwassmann–Wachmann 1 COHP, 24P/Schaumasse COHP, 21P/Giacobini-Zinner COHP.

linea-separador2

C/2019 K5 (Young)
2019 Aug. 03.72 UT: m1=15.6, Dia.=0.4’, DC=3; 40-cm L f:4.5(261x); Chris Wyatt (Walcha, NSW, Australia) [Very small and faint. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

P/2019 G1 (PANSTARRS)
2019 May  12.89 UT: m1=17.5 CCD, Dia.=1′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Observatory B74, Santa Maria de Montmagastrell, España)

C/2019 F1 (ATLAS-Africano)
2019 June 01.87 UT: m1=17.1 CCD, Dia.=1′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Remote Observatory B74, Santa Maria de Montmagastrell, Spain)
2019 Apr. 28.91 UT: m1=18.0 CCD, Dia.=0.3′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Observatory B74, Santa Maria de Montmagastrell, España)

C/2019 D1 (Flewelling)
2019 Aug. 05.99 UT: m1=17.4 CCD, Dia.=0.33′, DC=8/; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 May 31.10 UT: m1=13.2, Dia.=0.5′, DC=5; 20-cm SCT(200x); Juan Jose Gonzalez (Pandorado, Leon, Spain, 42º 47′ N, 6º 00′ W, alt. 1190 m) [Motion checked over a 20-min period. Nearby field stars checked in DSS. Limiting star magnitude near comet: 14.7 (AQ). Sidgwick method. APASS comparison stars. SQM: 21.1]

C/2019 A9 (PANSTARRS)
2019 Sep. 03.77 UT: m1= 11.5, Dia.=1.9’, DC=3/; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma small and diffuse, opaque centre, moderately condensed. Low altitude = 18.3°, Open Cluster NGC 2849 visible in same field to the North. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 28.77 UT: m1=12.3, Dia.=1’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, very diffuse transparent outer coma brightening to a small and well condensed and sometimes stellar centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 08.79 UT: m1=12.3, Dia.=1.3’, DC=3; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band. Diffuse and semi-transparent coma. Low altitude= 15.2°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

C/2018 Y1 (Iwamoto) 
2019 Apr. 24.85 UT: m1=13.0, Dia.=2.5, DC=3; 30-cm T f/10(80x); Martin Lehky (Czech Republic)
2019 Apr. 21.79 UT: m1=12.1, Dia.=1.6′, DC=1/; 25.4-cm L(190.5x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.48]
2019 Apr. 05.82 UT: m1=14.6 CCD, Dia.=0.65′, DC=7/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Apr. 04.81 UT: m1=14.9 CCD, Dia.=0.65′, DC=7/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Apr. 02.87 UT: m1=9.8, Dia.=6′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Celleron – Benllera, Leon, Spain. 42º 45′ N, 5º 44′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2019 Apr. 01.81 UT: m1=10.5, Dia.=3.5, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2019 Apr. 01.81 UT: m1=13.8 CCD, Dia.=0.87′, DC=6/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Apr. 01.76 UT: m1=11.0, Dia.=2′, DC=1/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 Mar. 30.80 UT: m1=10.5, Dia.=3.5’, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2019 Mar. 29.81 UT: m1=10.4, Dia.=4′, DC=1/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.70]
2019 Mar. 29.78 UT: m1=10.3, Dia.=4’, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2019 Mar. 28.78 UT: m1=10.2, Dia.=4.5’, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2019 Mar. 26.80 UT: m1=12.2 CCD, Dia.=1.77′, DC=6/; 0.15-m f/3.2 Volosov – Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Mar. 26.78 UT: m1=10.0, Dia.=5.5′, DC=2; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.98]
2019 Mar. 23.86 UT: m1=9.3, Dia.=5′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2019 Mar. 23.81 UT: m1=9.9, Dia.=4.9’, DC=3; 20×100 B; Martin Lehky (Czech Republic)
2019 Mar. 23.76 UT: m1=9.4, Dia.=8′, DC=2; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=7.00]
2019 Mar. 22.78 UT: m1=9.9, Dia.=4.5’, DC=3; 20×100 B; Martin Lehky (Czech Republic)
2019 Mar. 12.78 UT: m1=9.6, Dia.=5’, DC=3/; 20×100 B; Martin Lehky (Czech Republic)
2019 Mar. 11.96 UT: m1=8.7, Dia.=8′, DC=2/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2019 Mar. 10.73 UT: m1=9.5, Dia.=4.3′, DC=3/; 25-cm L(70x, 150x); Danil Sidorko (Korenovsk, Russia)
2019 Mar. 09.87 UT: m1=8.2, Dia.=10′, DC=3/; 25×100 B; Juan Jose Gonzalez (Alto del Trichero, Leon, Spain. 42º 46′ N, 5º 53′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Mar. 09.87 UT: m1=8.5, Dia.=8′, DC=3/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Trichero, Leon, Spain)
2019 Mar. 09.87 UT: m1=9.0, Dia.=5.5′, DC=2; 20-cm L(40x); Valentín Díaz (La Romaneta, Alicante, España)
2019 Mar. 09.86 UT: m1=8.8, Dia.=8′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España) [no tail]
2019 Mar. 05.77 UT: m1=8.6, Dia=7.5′, DC=2; 15.0-cm L(66x); Alexsandr Morozov (Novozybkov, Russia) [method S, orange zone]
2019 Mar. 04.96 UT: m1=8.6, Dia.=2′, DC=4; 15×70 B; Willian Souza (Paranapanema-SP, Brazil)
2019 Mar. 04.42 UT: m1=9.3, Dia.=10.5’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 19.0°. Coma enhances well in Swan Band filter while central condensation appears to dim in Swan Band. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M, Cat= TK]
2019 Mar. 03.41 UT: m1=8.6, Dia.=9.5’, DC=3; 11×70 B; Chris Wyatt (Walcha, NSW, Australia] [Difficult; Diffuse outer coma, slight brightening to centre. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= S, Cat= TK]
2019 Mar. 02.91 UT: m1=7.5, Dia.=13′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain. 43º 10′ N, 5º 54′ W, alt. 1221 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2019 Mar. 02.91 UT: m1=7.8, Dia.=10′, DC=3/; 25×100 B; Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain)
2019 Mar. 02.84 UT: m1=8.2, Dia.=12′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España) [no tail]
2019 Mar. 02.72 UT: m1=8.2, Dia.=11′, DC=2/; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.60]
2019 Feb. 27.96 UT: m1=7.8, Dia.=8’, DC=3/; 25×100 B; Martin Lehky (Czech Republic)
2019 Feb. 27.82 UT: m1=7.6, Dia.=15′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España) [no tail]
2019 Feb. 27.77 UT: m1=7.8, Dia.=11′, DC=3; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 26.89 UT: m1=7.8, Dia.=8’, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2019 Feb. 26.83 UT: m1=8.5, Dia.=10′, DC=2/; 6-cm B(20x); Alexsandr Morozov (Novozybkov, Russia) [method S, yellow zone]
2019 Feb. 26.78 UT: m1=7.6, Dia.=14′, DC=3; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany) [comet involved 9.3-mag star]
2019 Feb. 25.77 UT: m1=7.4, Dia.=14′, DC=3; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 25.77 UT: m1=7.5, Dia.=10’, DC=3/; 20×100 B; Martin Lehky (Czech Republic)
2019 Feb. 25.00 UT: m1=6.8, Dia.=15′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2019 Feb. 24.77 UT: m1=7.6, Dia.=15′, DC=3/; 12.0-cm R(30x); Maik Meyer (Linter, Germany)
2019 Feb. 24.44 UT: m1=7.7, Dia.=8; 10×50 B; David A. J. Seargent (Cowra, NSW, Australia) [Enhanced through Swan Band filter]
2019 Feb. 23.82 UT: m1=7.0, Dia.=14′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 23.76 UT: m1=7.6, Dia.=15′, DC=3/; 12.0-cm R(30x); Maik Meyer (Linter, Germany)
2019 Feb. 23.51 UT: m1=7.7, Dia.=15′, DC=3/; 10x70R; Seiichi Yoshida (Ibaraki, Japan)
2019 Feb. 23.51 UT: m1=8.3, Dia.=11′, DC=4; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Ibaraki, Japan)
2019 Feb. 22.82 UT: m1=7.3, Dia.=17′, DC=3/; 12.0-cm R(30x); Maik Meyer (Linter, Germany)
2019 Feb. 22.43 UT: m1=7.2; 10×50 B; David A. J. Seargent (Cowra, NSW, Australia) [Enhanced through Swan Band filter. Close to bright star making estimate very approximate]
2019 Feb. 21.81 UT: m1=6.7, Dia.=15′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 20.76 UT: m1=6.9, Dia,=&20′, DC=3/; 10×50 B; Maik Meyer (Linter, Germany)
2019 Feb. 18.77 UT: m1=7.1, Dia.=15’, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2019 Feb. 17.75 UT: m1=7.0, Dia.=10’, DC=3/; 25×100 B; Martin Lehky (Czech Republic)
2019 Feb. 17.08 UT: m1=6.9, Dia.=15’, DC=3; 12×60 B; Martin Lehky (Czech Republic)
2019 Feb. 16.18 UT: m1=6.7, Dia.=&20′, DC=3; 7×50 B; Maik Meyer (Linter, Germany)
2019 Feb. 16.08 UT: m1=6.9, Dia.=15’, DC=3; 12×60 B; Martin Lehky (Czech Republic)
2019 Feb 15.14 UT: m1=7.1:, Dia.=&20′, DC=3/; 10×50 B; Maik Meyer (Linter, Germany) [comet involved w/ asterism of 3 stars of 7.5, 8.7, and 9.4 mag, respectively]
2019 Feb. 13.14 UT: m1=5.5, Dia.=30′, DC=5; Naked Eye; Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [In 12×45 monocular: m1=5.7, Dia.=22′, DC=4/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5, 21.6 at zenit]
2019 Feb. 13.14 UT: m1=5.7, Dia.=22′, DC=4/; 12×45 monocular; Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain)
2019 Feb. 13.04 UT: m1=6.3, Dia.=30′, DC=4/; 10×50 B; Maik Meyer (Linter, Germany)
2019 Feb. 12.85 UT: m1=6.4, Dia.=15’, DC=4/; 12×60 B; Martin Lehky (Czech Republic)
2019 Feb. 12.03 UT: m1=5.5, Dia.=30′, DC=5; Naked Eye; Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain. 43º 9′ N, 5º 54′ W, alt. 1179 m) [In 12×45 monocular: m1=5.6, Dia.=25′, DC=4. Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2019 Feb. 12.03 UT: m1=5.6, Dia.=25′, DC=4; 12×45 monocular; Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain)
2019 Feb. 11.99 UT: m1=5.6, Dia.=28′, DC=4; Naked Eye; Carlos Labordena (Castellón, España)
2019 Feb. 11.95 UT: m1=5.8, Dia.=25′, DC=4; 3.3-cm R(5x); Carlos Labordena (Castellón, España)
2019 Feb. 11.64 UT: m1=6.6, Dia.=30’, DC=4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, transparent outer coma, opaque inner coma, moderately condensed centre. Comparison stars checked using Yale Bright Star data in Guide 9.0. Method= M, Cat= YG]
2019 Feb. 11.04 UT: m1=6.8, Dia.=8′, DC=3; 9.0-cm R f/5.5(33x); Willian Souza (Sao Paulo, Brazil)
2019 Feb. 11.03 UT: m1=6.7, Dia.=8′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2019 Feb. 10.89 UT: m1=6.4, Dia.=25′, DC=2.5; 6-cm B(20x); Alexsandr Morozov (Novozybkov, Russia) [method S]
2019 Feb. 10.29 UT: m1=6.2, Dia.=30′, DC=4; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2019 Feb. 10.08 UT: m1=6.7, Dia.=10′, DC=3/; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2019 Feb. 09.99 UT: m1=6.2, Dia.=17′, DC=5; 10X50 B; Valentín Díaz (La Romaneta, Alicante, España)
2019 Feb. 09.69 UT: m1=7.0, Dia.=17.4’; DC=5/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Close to bright stars, sometimes appears to have a faint stellar pseudo nucleus. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M, Cat= TK]
2019 Feb. 09.50 UT: m1=7.3, Dia.=16′, DC=4; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia) [Moderately enhanced through Swan Band filter]
2019 Feb. 09.25 UT: m1=6.3, Dia.=30′, DC=4/; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2019 Feb. 09.08 UT: m1=6.8, Dia.=10′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2019 Feb. 08.96 UT: m1=6.1, Dia.=25′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 08.95 UT: m1=6.3, Dia.=20′, DC=4; 15-cm T(30x); Carlos Labordena (Castellón, España)
2019 Feb. 08.17 UT: m1=6.5, Dia.=25′, DC=4/; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2019 Feb. 08.10 UT: m1=6.6, Dia.=25′, DC=4; 10×50 B; Maik Meyer (Linter, Germany)
2019 Feb. 07.94 UT: m1=7.2, Dia.=20′, DC=3; 6-cm B (20x); Alexsandr Morozov (Novozybkov, Russia) [method S]
2019 Feb. 07.19 UT: m1=7.1, Dia.=20’, DC=3; 12×60 B; Martin Lehky (Czech Republic)
2019 Feb. 07.12 UT: m1=6.7, Dia.=20, DC=4; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [with 20 x 100 B: Tail= 20 arcmin in PA: 295°]
2019 Feb. 06.14 UT: m1=6.9, Dia.=20′, DC=3/; 10×50 B; Maik Meyer (Linter, Germany)
2019 Feb. 06.04 UT: m1=5.9, Dia.=30′, DC=3, Tail= 1.3 deg. in PA: 300 deg.; 12×45 monocular; Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain. 43º 9′ N, 5º 54′ W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3; 21.5 at zenit]
2019 Feb. 04.68 UT: m1=7.2, Dia= 25’, DC= 4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque moderately condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M, Cat= TK]
2019 Feb. 04.19 UT: m1=7.3, Dia.=10′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 04.18 UT: m1=7.4, Dia.=11′, DC=4; 15-cm T(30x); Carlos Labordena (Castellón, España)
2019 Feb. 04.15 UT: m1=7.3, Dia.=20’, DC=4; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 04.14 UT: m1=7.1, Dia.=25’, DC=3; 10×50 B; Maik Meyer (Linter, Germany)
2019 Feb. 04.02 UT: m1=7.1, Dia.=16′, DC=3; 10X50 B; Valentín Díaz; (Cancárix, Albacete, España).
2019 Feb. 04.02 UT: m1=7.3, Dia.=12′, DC=3; 20X80 B; Valentín Díaz; (Cancárix, Albacete, España).
2019 Feb. 03.69 UT: m1=7.2, Dia.=21’, DC=4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Diffuse, transparent outer coma, opaque inner coma. Moderately condensed. Enhances well in Swan band filter. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M, Cat= TK]
2019 Feb. 03.10 UT: m1=6.1, Dia.=35′, DC=2/, Tail= 3.5 deg. in PA: 300 deg.; 12×45 monocular; Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain. Alt. 870 m, 42º 20′ N, 5º 23′ W) [Very wide and diffuse outer coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3; 21.4 at zenit]
2019 Feb. 03.07 UT: m1:8.0, Dia.=7′, DC=1; 20X80 B; Valentín Díaz (Elche ciudad, España)
2019 Jan. 21.25 UT: m1=9.3, Dia.=6′, DC=4; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Total lunar eclipse]
2019 Jan. 21.22 UT: m1=7.3, Dia.=15′, DC=3; 10×50 B; Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain. Alt. 870 m, 42º 20′ N, 5º 23′ W) [Observed during total moon eclipse. From dark rural skies the comet shows a faint tail and wide coma. Altitude: 25 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0; 21.5 at zenit]
2019 Jan. 21.22 UT: m1=7.5, Dia.=15′, DC=3; 25×1000 B; Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain. Alt. 870 m, 42º 20′ N, 5º 23′ W)
2019 Jan. 21.22 UT: m1=8.1, Dia.=12′, DC=3/, Tail= 0.3 deg. in PA: 290 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain. Alt. 870 m, 42º 20′ N, 5º 23′ W)
2019 Jan. 21.20 UT: m1=9.6, Dia.=4′, DC=2/; 25.4-cm L f:5(64x); Maik Meyer (Linter, Germany) [all obs during total lunar eclipse]
2019 Jan. 19.24 UT: m1=9.5, Dia.=4′, DC=3; 20-cm T(50x); Carlos Labordena (Castellón, España)
2019 Jan. 14.68 UT: m1=10.0, Dia.=6.4’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band filter, coma slightly elongated to the NE approximately. Opaque centre, fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2019 Jan. 14.26 UT: m1=8.2, Dia.=10′, DC=2; 25×100 B; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 25×100 B: from dark mountain skies the comet shows a wide and diffuse outer coma. Altitude: 25 deg. In 20-cm SCT(77x): m1=8.7, Dia.=8′, DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2019 Jan. 14.26 UT: m1=8.7, Dia.=8′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W)
2019 Jan. 12.62 UT: m1=9.7, Dia.=5’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Opaque centre, pale aqua-blue in colour. Faint outer coma. Low altitude= 16.8°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2019 Jan. 07.67 UT: m1=10.2, Dia.=4.5’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Moderately condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2019 Jan. 07.26 UT: m1=8.9, Dia.=8′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 22 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7; 21.6 at zenith]
2019 Jan. 06.83 UT: m1=11.6, Dia.=2.4′, DC=1; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Ibaraki, Japan)
2019 Jan. 03.23 UT: m1=11.2, Dia.=1.2′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Jan. 02.25 UT: m1=9.2, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 19 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2018 Dec. 30.69 UT: m1=11.3, Dia.=1.4’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma diffuse, slight brightening to centre, enhances in Swan band filter. Visible at x39 but just above background sky threshold under moonlit conditions, difficult to obtain measurement at that scale. Elongation from the Moon is approximately 21 degrees. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Dec. 30.29 UT: m1=10.9:, Dia.=1.5′, DC=4,; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]

C/2018 W2 (Africano)
2019 Sep. 20.80 UT: m1=8.3, Dia.=&10′, DC=2/; 12.0-cm R(30x); Maik Meyer (Linter, Germany) [Very diffuse and ill-defined, movement noticeable within 15 minutes]
2019 Sep. 19.74 UT: m1=9.4, Dia.=6′, DC=3; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.86]
2019 Sep. 11.07 UT: m1=9.8, Dia.=4.5, DC=2/; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Sep. 09.69 UT: m1=9.6, Dia.=6′, DC=2; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2019 Sep. 06.93 UT: m1=10.1, Dia.=4.5′, DC=3; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.53]
2019 Sep. 06.07 UT: m1=10.1, Dia.=3.5′, DC=2/; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Sep. 05.74 UT: m1=10.7, Dia.=3.9’, DC=3; 40-cm L(59x); Chris Wyatt (Walcha, NSW, Australia) [Very low altitude= 5.9°. Very diffuse, transparent coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Sep. 04.92 UT: m1=10.3, Dia.=3′, DC=3; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [Near bright star 8.7m, method S, Lm=6.68]
2019 Sep. 04.88 UT: m1=12.8 CCD, Dia.=1.06′, DC=6/, Tail=1′ in PA=240 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 04.85 UT: m1=11.6, Dia.=1.3′, DC=2/; 0.41-m Newton(63x); Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 04.10 UT: m1=9.8, Dia.=6′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2019 Sep. 03.74 UT: m1=10.8, Dia.=3.6’, DC=2; 40-cm L(59x); Chris Wyatt (Walcha, NSW, Australia) [Very low altitude = 4.9°; Slightly enhances in Swan Band filter. Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Sep. 03.07 UT: m1=10.0, Dia.=4′, DC=3; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Sep. 03.02 UT: m1=13.2 CCD, Dia.=0.90′, DC=7/, Tail=1.86′ in PA=246 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 01.92 UT: m1=10.0, Dia.=5.5′, DC=2/; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.68]
2019 Sep. 01.05 UT: m1=10.4, Dia.=3.5′, DC=2; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2019 Aug. 31.00 UT: m1=10.5, Dia.=2.5′, DC=2/; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Aug. 28.05 UT: m1=9.9, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2019 Aug. 28.04 UT: m1=10.1, Dia.=4.5′, DC=2/; 12.0-cm R(30x); Maik Meyer (Frauenstein, Germany)
2019 Aug. 26.99 UT: m1=13.7 CCD, Dia.=0.62′, DC=6/; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Aug. 26.89 UT: m1=10.2, Dia.=3.1′, DC=3; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.68]
2019 Aug. 23.89 UT: m1=10.6, Dia.=2.0′, DC=2/; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Aug. 23.81 UT: m1=10.7, Dia.=1.9′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.68]
2019 Aug. 22.90 UT: m1=9.8, Dia.=5′, DC=2; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Several stars in coma, the brightest being mag 11.1 (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2019 Aug. 16.76 UT: m1=11.1, Dia.=1.8′, DC=2/; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2019 Aug. 11.98 UT: m1=10.6, Dia.=2′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.50]
2019 Aug. 09.92 UT: m1=11.2, Dia.=2.1′, DC=3/; 25-cm L(150x); Danil Sidorko (Korenovsk, Russia)
2019 Aug. 09.03 UT: m1=10.8, Dia.=2.5′, DC2/; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Aug. 08.99 UT: m1=10.8, Dia.=2.5′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.70]
2019 Aug. 06.92 UT: m1=11.0, Dia.=2.6′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 Aug. 05.09 UT: m1=10.2, Dia.=4′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Aug. 04.11 UT: m1=11.6, Dia.=2′, DC=2; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2019 Aug. 04.04 UT: m1=11.3, Dia.=3′, DC=2/; 25.4-cm L(64x); Maik Meyer (Linter, Germany)
2019 Aug. 02.94 UT: m1=11.3, Dia.=2.2′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 Aug. 02.11 UT: m1=10.3, Dia.=4′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Aug. 01.01 UT: m1=11.5, Dia.=2.0′, DC=3; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 July 30.03 UT: m1=10.3, Dia.=4′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 July 30.02 UT: m1=11.8, Dia.=1.2′, DC=3; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 July 29.95 UT: m1=11.6, Dia.=1.8′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, LM=6.44]
2019 July 28.93 UT: m1=11.9, Dia.=1.8′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.29]
2019 July 24.94 UT: m1=10.4, Dia.=4′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 July 24.86 UT: m1=11.7, Dia.=1.9′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2019 July 16.90 UT: m1=11.8, Dia.=2.2′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, partial lunar eclipce]
2019 July 10.92 UT: m1=12.3, Dia.=1.6′, DC=3; 25.4-cm L(190.5x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.38]
2019 July 10.02 UT: m1=12.0, Dia.=1.3′, DC=3/; 25.4-cm L f:5(104x); Maik Meyer (Linter, Germany)
2019 July 6.10 UT: m1=11.1, Dia.=4′, DC=2/; 20-cmSCT (100x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Brighter than expected. Altitude: 28°. Observation made under better conditions, from a dark mountain location, providing a much wider coma diameter and brighter m1 estimate in comparison with my previous June 26.96 observation. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 June 26.96 UT: m1=12.7, Dia.=0.6′, DC=5; 20-cm SCT(133x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Nearby field stars checked in DSS. Altitude: 16°. Sidgwick method. APASS comparison stars. SQM: 21.3]
2019 May  24.85 UT: m1=14.7, Dia.=0.3′, DC=3; 50-cm L(300x); Sandor Szabo (Sopron, Hungary)
2019 Apr. 26.97 UT: m1=16.5 CCD, Dia.=0.38′, DC=7/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Apr. 05.05 UT: m1=16.4 CCD, Dia-=0.27′, DC=8; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)

C/2018 W1 (Catalina)
2019 July 23.41 UT: m1=13.9, Dia.=0.6’, DC=2/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Very small and diffuse. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 July 20.36 UT: m1=13.0, Dia.=0.8’, DC=2; 25-cm L f:5(179x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse and weakly condensed. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019  May 31.35 UT: m1=11.2; Dia.=4.5’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 16.0°; Diffuse coma, weakly condensed. Enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019  May 30.36 UT: m1=11.4; Dia.=3.5’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 14.3°; Diffuse coma, weakly condensed but slightly brighter inner coma. Enhances slightly in Swan Band filter. Visible at x39. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019  May  28.34 UT: m1=11.2, Dia.=2.4’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Diffuse transparent outer coma, weakly condensed centre. Low altitude= 17.4°. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]

C/2018 R3 (Lemmon)
2019 July 05.92 UT: m1=9.3, Dia.=5′, DC=2/; 20-cmSCT (100x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Astronomical twilight. Altitude: 11°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2019 June 26.92 UT: m1=9.5, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Astronomical twilight. Altitude: 15°. Mag. 11.2 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2019 June 06.90 UT: m1=10.6, Dia.=2.3′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 June 03.89 UT: m1=10.8, Dia.=2.1′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.70]
2019 June 02.89 UT: m1=10.8, Dia.=2′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.90]
2019 June 01.91 UT: m1=10.6, Dia.=1.5′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.84]
2019 May  31.90 UT: m1=10.2, Dia.=1.4′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [height 20 degrees, method S, Lm=6.70]
2019 May  30.93 UT: m1=10.1, Dia.=4′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Pandorado, Leon, Spain, 42º 47′ N, 6º 00′ W, alt. 1190 m) [Altitude: 18°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2019 May  26.94 UT: m1=11.8, Dia=1.2′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.79]
2019 May  24.85 UT: m1=11.6, Dia.=1.8′, DC=4; 50-cm L(123x); Sandor Szabo (Sopron, Hungary)
2019 May  13.96 UT: m1=14.2 CCD, Dia.=0.66′, DC=7/; 0.20-m Schmidt-Newtonian f/4 + CCD; Sergey Shurpakov (Observatory C36, Belarus)

C/2018 N2 (ASASSN)  
2019 Sep. 11.09 UT: m1=11.6, Dia.=1.5, DC=5; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 10.00 UT: m1=11.6, Dia.=1.2′, DC=5, Tail= 2 arcmin. in PA: 170 deg.; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.63]
2019 Sep. 09.70 UT: m1=11.9, Dia.=1.5′, DC=7; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2019 Sep. 07.27 UT: m1=12.1, Dia.=1′, DC=5; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2019 Sep. 06.08 UT: m1=11.6, Dia.=1.5′, DC=5; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 05.73 UT: m1=12.6, Dia.=1.2’, DC=6; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 1.5’ in length in P.A. 185° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 04.97 UT: m1=13.2 CCD, Dia.=0.73′, DC=7, Tail=7′ in PA=188 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 04.95 UT: m1=11.2, Dia.=1.2′, DC=5/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.79]
2019 Sep. 04.02 UT: m1=11.7, Dia.=1.5′, DC=5; 20-cm SCT (100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Sep. 03.72 UT: m1=12.3, Dia.=1’, DC=6; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 3.9’ in length in P.A. 188° approximately; Coma diffuse, opaque central condensation with faint stellar pseudo-nucleus visible. Coma dims in Swan Band filter although centre stays visible but not enhanced. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 03.09 UT: m1=12.0, Dia.=2′, DC=5; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 02.95 UT: m1=12.9 CCD, Dia.=0.84′, DC=6/, Tail=5.6′ in PA=190 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 01.94 UT: m1=11.8, Dia.=1.3′, DC=5, Tail= 2.5 arcmin in PA: 205 deg.; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [metod S, Lm=6.68]
2019 Aug. 31.02 UT: m1=12.0, Dia.=1.6′, DC=4/; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Aug. 28.75 UT: m1=12.3, Dia.=1’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Interference by background star in coma, coma small with opaque centre. Dims in Swan Band filter, visible at x58. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 27.94 UT: m1=12.3, Dia.=1′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.69]
2019 Aug. 26.90 UT: m1=13.2 CCD, Dia.=0.62′, DC=7/, Tail=4.3′ in PA=194 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Aug. 23.94 UT: m1=13.1 CCD, Dia.=0.73′, DC=7/, Tail=6′ in PA=194 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Aug. 16.74 UT: m1=12.3, Dia.=0.7′, DC=4/; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2019 Aug. 09.05 UT: m1=12.0, Dia.=1.2′, DC=4/; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Aug. 08.95 UT: m1=12.4, Dia.=1′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 Aug. 08.74 UT: m1=13.2, Dia.=1’, DC=6; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, faint outer coma, stellar pseudo-nucleus. Faint tail visible 2.5’ in length in P.A. 200° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 06.02 UT: m1=13.9 CCD, Dia.=0.66′, DC=7/, Tail=2.12′ in PA=192 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Aug. 05.12 UT: m1=11.7, Dia.=1.5′, DC=5; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Aug. 03.73 UT: m1=13.5, Dia.=0.7’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 0.9’ in length in P.A. 215°. Opaque centre, faint outer coma. Sometimes appears faintly stellar. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 02.10 UT: m1=11.7, Dia.=1.5′, DC=4; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 July 30.14 UT: m1=11.9, Dia.=1.2′, DC=5; 20-cm SCT(133x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. APASS comparison stars. SQM: 21.4]
2019 Jan. 01.83 UT: m1=12.9, Dia.=0.8′, DC=5; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 12 deg. Sidgwick method. APASS comparison stars. SQM: 20.9]
2018 Dec. 28.46 UT: m1=13.9, Dia.=1.5’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Faintly stellar in good seeing, diffuse coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Dec. 27.45 UT: m1=13.7, Dia.=1.1’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faintly stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 29.50 UT: m1=14.3, Dia.=1’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse outer coma, small pseudo-nucleus visible. Difficult due to proximity to bright star in field. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 26.45 UT: m1=14.0, Dia.=1’, DC=3/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Diffuse outer coma, small central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 11.68 UT: m1=14.0, Dia.=1’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Small coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 10.66 UT: m1=14.0, Dia.=1.5’, DC=3/; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult due to bright star in field, coma small. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 03.42 UT: m1=14.3, Dia.=0.5’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Diffuse outer coma, opaque inner coma, weakly condensed. Limiting magnitude= 15.0. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 30.45 UT: m1=14.0, Dia.=0.8’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very small, slightly brighter centre. Motion checked over 1 hour period, close to mag 14.9 star. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

C/2018 L2 (ATLAS) 
2019 Apr. 05.07 UT: m1=15.7 CCD, Dia.=0.33′, DC=8; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Jan. 25.79 UT: m1=9.3, Dia.=6′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Villacintor, Leon, Spain. Alt. 930 m, 42º 29′ N, 5º 11′ W) [Mag. 11.3 (TK) star in coma. Altitude: 12 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.3]
2019 Jan. 06.78 UT: m1=9.4, Dia.=6′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 13 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7; 21.2 at zenith]
2019 Jan. 01.77 UT: m1=9.3, Dia.=6′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2018 Dec. 29.77 UT: m1=9.7, Dia.=4.5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 06.77 UT: m1=9.2, Dia.=4.5′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 01.38 UT: m1=11.7, Dia.=1.3′, DC=3; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.37 UT: m1=11.3, Dia.=1.3′, DC=4; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 06.72 UT: m1=9.8, Dia.=4’, DC=2; 20×100 B; Martin Lehky (Czech Republic)
2018 Nov. 03.78 UT: m1=9.1, Dia.=6′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Zodiacal light. Altitude: 15 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2018 Oct. 03.82 UT: m1=9.8, Dia.=5′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Brighter than expected. Altitude: 13 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]

C/2018 A6 Gibbs
2019 Sep. 05.71 UT: m1=13.9, Dia.= 0.5’, DC=3; 40-cm L(261x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, brighter centre, weakly condensed. Poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 03.76 UT: m1=13.8, Dia.=0.9’, DC=3/; 40-cm L(261x); Chris Wyatt (Walcha, NSW, Australia) [Coma small and diffuse, opaque centre, moderately condensed. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 28.76 UT: m1=14.0, Dia.=0.5’, DC=6; 40-cm L f:4.5 (261x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faint stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 08.75 UT: m1=13.8, Dia.=0.4’, DC=3/; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 19.8°; Small coma, opaque and weakly condensed. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 03.78 UT, m1=14.2, Dia.=0.9’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma opaque at centre, faint outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 July 20.37 UT: m1=14.2, Dia.=0.5’, DC=2/; 25-cm L f:5(179x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 19.1°; Small coma, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 May  30.37 UT: m1=14.0, Dia.=0.7’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Faint stellar centre visible in good seeing. Small opaque outer coma. Slight glare from nearby star. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 May  08.46 UT: m1=14.0, Dia.=0.7’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, brighter centre, faint stellar pseudo-nucleus visible in good seeing periods. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 May  06.42 UT: m1=14.0, Dia.=0.7’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Small coma, faint pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Apr. 28.40 UT: m1=14.0, Dia.=0.6’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Small hazy outer coma, faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]

C/2018 A3 (ATLAS)
2019 Sep. 03.04 UT: m1=17.6 CCD, Dia.=0.22′, DC=8; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2018 Nov. 14.16UT: m1=[16,0 NEGATIVE; 60-cm L(406x); Sandor Szabo (Sopron, Hungary)
2018 Oct. 13.10 UT: m1=16.0 CCD, Dia.=0.28′, DC=8; 0.20-m f/4 Schmidt-Newton + CCD; S. Shurpakov (Observatory A98, Belarus)
2018 Apr. 06.96 UT: m1=[16.2, negative; 60-cm reflector (517x); Sandor Szabo (Sopron, Hungary)

C/2017 T2 (PANSTARRS) 
2019 Sep. 11.10 UT: m1=12.2, Dia.=1.1, DC=3/; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 11.01 UT: m1=12.1, Dia.=1.3′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.48]
2019 Sep. 09.74 UT: m1=11.6, Dia.=1.8′, DC=5; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2019 Sep. 07.01 UT: m1=12.6, Dia.=0.9′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.86]
2019 Sep. 06.11 UT: m1=12.3, Dia.=1′, DC=3/; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 05.76 UT;: m1=13.6, Dia.=0.9’, DC=6; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Short, faint tail visible, traced to 1.5’ in length in P.A. 228°. Stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 05.08 UT: m1=14.5 CCD, Dia.=0.39′, DC=6/; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 04.17 UT: m1=9.6, Dia.=6′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Diffuse outer coma appears smaller and fainter than in previous observation: diameter 6′, providing m=9.6 at 77x. Brighter inner coma diameter 2′, providing m=11.3 at 133x. Zodiacal light. Nearby field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Sep. 03.73 UT: m1=13.3, Dia.=1.5’, DC=5/; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Diffuse transparent coma, faint stellaring in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 02.99 UT: m1=12.9, Dia.=0.9′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.66]
2019 Aug. 28.75 UT: m1=13.8, Dia.=0.7’, DC=6; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faint stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 28.14 UT: m1=8.8, Dia.=8′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 37°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Aug. 12.385 UT: m1=10.0, Dia.=4′, DC=2; 20×80 B; Roger Jiménez (Barquisimeto, Venezuela. 10º04’40.2”N 69º19’25.7”W, Alt. 606 msnm) [Altura= 45º. MALE= 4.5. Tycho-2 comparison stars]
2019 Aug. 05.14 UT: m1=9.0, Dia.=6′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Astronomical twilight. Altitude: 23°. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2019 Aug. 04.13 UT: m1=10.8, Dia.=3′, DC=2; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2019 Aug. 03.75 UT: m1=14.3, Dia.=0.6’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma small, semi-transparent outer coma. Sometimes appears faintly stellar. Low altitude= 13.3°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 02.99 UT: m1=10.8, Dia.=1.5′, DC=2; 25.4-cm L(190.5x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 Aug. 02.15 UT: m1=8.7, Dia.=7′, DC=2; 25×100 B; Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [In 20 cm SCT(77x): m1=8.9. Astronomical twilight. Altitude: 23°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2019 Aug. 02.00 UT: m1=10.8, Dia.=1.5′, DC=2; 25.4-cm L(190.5x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2019 Aug. 01.385 UT: m1=9.3, Dia.=1′, DC=8; 20×80 B; Roger Jiménez (Barquisimeto, Venezuela. 10º04’40.2”N 69º19’25.7”W) [Altura: 37º. Tycho-2 comparison stars]
2019 July 30.15 UT: m1=8.7, Dia.=7′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Astronomical twilight. Altitude: 22°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2019 Apr. 02.85 UT: m1=9.2, Dia.=6′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Celleron – Benllera, Leon, Spain. 42º 45′ N, 5º 44′ W, alt. 1190 m) [Faint and diffuse outer coma. Altitude: 10°. Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2019 Mar. 23.84 UT: m1=10.7, Dia.=3.5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. 42º 55′ N, 5º 48′ W, alt. 1720 m) [Brighter than expected. Possible previous outburst. Brighter inner coma diameter 3.5′, providing m=10.7. Faint and diffuse outer coma diameter 5.5′, providing m=9.6. Nearby field stars checked in DSS. Limiting stellar magnitude fainter than 13.7 (AQ). Altitude: 18°. Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2019 Mar. 09.84 UT: m1=12.3, Dia.=2.3′, DC=2/; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Trichero, Leon, Spain. 42º 46′ N, 5º 53′ W, alt. 1190 m) [Brighter than expected. Faint and diffuse outer coma. Altitude: 27°. Nearby field stars checked in DSS. Limiting stellar magnitude fainter than 14.1 (GSC). Sidgwick method. APASS comparison stars. SQM: 20.9]
2018 Nov. 14.03 UT: m1=15.7, Dia.=0.25′, DC=3; 60-cm L(305x); Sandor Szabo (Sopron, Hungary)

C/2017 M4 (ATLAS) 
2019 Aug. 28.41 UT: m1=14.8, Dia.=0.5’, DC=2/; 40-cm L f:4.5(261x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, small with weakly condensed centre. Seeing poor, sky slightly hazy with raised dust. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 July 23.42 UT: m1=14.3, Dia.=0.8’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma small, opaque, stellar pseudo-nucleus visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 May  30.38 UT: m1=13.5, Dia.=0.9’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Small coma, opaque centre with stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 May  08.46 UT: m1=12.8, Dia.=2’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slightly brighter at centre but weakly condensed. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 May  06.44 UT: m1=13.2, Dia.=1.3’, DC=5/; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma small, sometimes appears stellar in good seeing, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 09.71 UT: m1=13.3, Dia.=0.8’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Small, difficult and diffuse. Sometimes appears stellar at centre. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2018 Oct. 07.43 UT: m1=14.0, Dia.=0.4′, DC=3/; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 17.46 UT: m1=[13.7, negative; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Aug. 10.83 UT: m1=15.5 CCD, Dia.=0.44′, DC=3; 0.20-m f/4 Schmidt-Newton + CCD; Sergey Shurpakov (Observatory A98, Baran’, Belarus)
2018 Aug. 08.40 UT: m1=14.1, Dia.=0.6’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Small diffuse coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 02.89 UT: m1=15.1 CCD, Dia.=0.39′, DC=4; 0.20-m f/4 Schmidt-Newton + CCD; Sergey Shurpakov (Observatory A98, Baran’, Belarus)
2018 Aug. 01.37 UT: m1=14.2, Dia.=0.8’, DC=2/; 25-cm L f:5 (83x); Chris Wyatt, Walcha, NSW, Australia) [Difficult, very diffuse. Visible in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 July 30.37 UT: m1=14.1, Dia.=0.7’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult due to glare from bright star in field. Visible in periods of good seeing with bright star just out of field. Coma small. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 July 13.93 UT: m1=13.9, Dia.=0.5′, DC=6; 60-cm L (188x); Sandor Szabo (Sopron, Hungary)
2018 July 13.51 UT: m1=13.6, Dia.=0.4′, DC=6; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2018 July 12.94 UT: m1=14.7 CCD, Dia.=0.28′, DC=8/; 0.20-m f/4 Schmidt-Newton + CCD; Sergey Shurpakov (Observatory A98, Baran’, Belarus)
2018 July 08.93 UT: m1=13.5, Dia.=0.7’, DC=6/; 35-cm L (200x); Gábor Sánta (Göd, county Pest, Hungary) [h= 74 deg., NELM= 5,8. Coma is very obvious, with 150x it is like a planetary nebula, with 200x it seems diffuse, and, with 275x, it is a very strongly condensed comet with exponential light profile, and, in the best seconds, a 16th-magnitude nucleus can be suspected. Very nice comet!]
2018 June 12.98 UT: m1=14.4, Dia.=–, DC=9; 20-cm SCT (133x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Quasi-stellar appearance. In-focus method. Comparison stars taken from Henden photometry near DQ Her. Field stars checked in DSS. Limiting star magnitude near comet: 14.7 (Henden). SQM: 21.6]
2018 May 21.90 UT: m1=15.7 CCD, Dia.=0.39′, DC=4/; 0.20-m f/4 Schmidt-Newton + CCD; Sergey Shurpakov (Observatory A98, Baran’, Belarus)
2018 May 07.96 UT: m1=15.1 CCD, Dia.=0.33′, DC=6/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2018 May 04.95 UT: m1=15.9 CCD, Dia.=0.18′, DC=6; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2018 May 02.98 UT: m1=15.8 CCD, Dia.=0.18′, DC=6; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2018 Apr. 08.02 UT: m1=15.6 CCD, Dia.=0.37′, DC=7/; 0.25-m f/4.7 reflector + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2018 Apr. 09.07 UT: m1=16.2 CCD, Dia.=0.37′, DC=8; 0.25-m f/4.7 reflector + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2018 Mar. 05.12 UT: m1=16.3 CCD, Dia.=0.17′, DC=9; 0.20-m L f/4 + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)

C/2017 B3 (LINEAR)
2019 Sep. 05.70 UT: m1=14.0, Dia.=0.8’, DC=5/; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Centre opaque, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 03.69 UT: m1=13.8, Dia.=1.3’, DC=5/; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Diffuse coma, opaque centre, sometimes stellar pseudo-nucleus visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 28.70 UT: m1=14.0, Dia.=1.3’, DC=5/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, sometimes stellar pseudo-nucleus visible, fading to edges. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 08.70 UT: m1=14.4, Dia.=1.1’, DC=6; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus, coma diffuse with opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 03.69 UT: m1=14.2, Dia.=1.4’, DC=6; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus, hazy outer coma, does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 May 08.74 UT: m1=14.4, Dia.=0.6’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very small, diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]

C/2016 R2 (PANSTARRS)
2019 June 01.89 UT: m1=15.0 CCD, Dia.=1′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Remote Observatory B74, Santa Maria de Montmagastrell, Spain)
2019 May  20.01 UT: m1=15.1 CCD, Dia.=1′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Observatory B74, Santa Maria de Montmagastrell, España)
2019 Apr. 02.06 UT: m1=16.1 CCD, Dia.=0.55′, DC=7/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Mar. 24.96 UT: m1=16.2 CCD, Dia.=0.41′, DC=7/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Mar. 06.98 UT: m1=16.3 CCD, Dia.=0.30′, DC=7/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Mar. 01.98 UT: m1=16.4 CCD, Dia.=0.30′, DC=7/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Jan. 14.19 UT: m1=10.5, Dia.=6′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Jan. 02.26 UT: m1=10.7, Dia.=6′, DC=1; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Several stars inside the coma, the brightest being mag. 12.6 (AQ). Sidgwick method. Tycho-2 comparison stars. SQM: 21.5.]
2018 Nov. 16.16 UT: m1=10.2, Dia.=7′, DC=1/; 20-cm SCT(100x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Altitude: 18 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2018 Nov. 14.13 UT: m1=12.8, Dia.=1.2′, DC=1; 60-cm L(244x); Sandor Szabo (Sopron, Hungary)
2018 Nov. 13.16 UT: m1=10.2, Dia.=7′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1280 m, 43º 10′ N, 5º 54′ W) [Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Mag. 12.1 (TK) star in coma. Altitude: 18 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2018 Nov. 09.19 UT: m1=10.3, Dia.=6′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Altitude: 25 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2018 Nov. 03.80 UT: m1=10.5, Dia.=5′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Faint tail difficult to separate from the coma. The magnitude estimate is related to the observed width of the coma and tail. Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Nov. 03.80 UT: m1=[11.8, negative; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 20.20 UT: m1=11.0, Dia.=5′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 23 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Oct. 16.18 UT: m1=10.7, Dia.=5′, DC=2; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 18 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Oct. 03.84 UT: m1=10.3, Dia.=6′, DC=2; 20-cm SCT(100x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 Sep. 15.08 UT: m1=15.0 CCD, Dia.=0.36′, DC=4/; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Belarus)
2018 Sep. 01.87 UT: m1=10.5, Dia.=5′, DC=2, Tail= 0.3 deg. in PA: 10 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Observation made under better conditions than in my previous August estimates. It was possible to separate the faint tail from the coma for the m1 determination. Altitude: 18 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Aug. 14.90 UT: m1=10.4, Dia.=7′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Faint tail difficult to separate from the coma. The bright magnitude estimate (10.4) is related to the 7′ observed width of the coma and tail. Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Aug. 10.84 UT: m1=13.7 CCD, Dia.=0.60′, DC=4/, Tail= 1.8′ in PA: 359 deg.; 0.20-m f/4 Schmidt-Newton + CCD; Sergey Shurpakov (Observatory A98, Baran’, Belarus)
2018 Aug. 09.90 UT: m1=10.7, Dia.=6′, DC=1/; 20-cm SCT (77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Better observing conditions than in previous dates allowed to observe some extension of the faint tail, difficult to separate from the coma. The brighter magnitude estimate (10.7) is related to the 6′ observed width of the coma and tail. Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM : 21.2; 21.6 at zenith]
2018 Aug. 01.90 UT: m1=11.3, Dia.=2.5′, DC=2; 20-cm SCT (77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [End of astronomical twilight. Altitude: 18 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0.]
2018 July 09.92 UT: m1=11.3, Dia.=2.5′, DC=27; 20-cm SCT (77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [End of astronomical twilight. Altitude: 17 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 June 16.90 UT: m1=11.7, Dia.=1.5′, DC=2; 20-cm T(80x); Carlos Labordena (Castellón, España)
2018 June 12.93 UT: m1=11.5, Dia.=2′, DC=2; 20-cm SCT (77x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1. Altitude: 15 deg.]
2018 May  15.90 UT: m1=11.3, Dia.=2′, DC=2/; 20-cm SCT (133x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9. Zodiacal light. Altitude: 22 deg.]
2018 May  11.87 UT: m1=11.8, Dia.=1.5′, DC=2, no tail; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2018 May  08.90 UT: m1=11.1, Dia.=2.5′, DC=2; 20-cm SCT (77x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9. Zodiacal light. Altitude: 24 deg.]
2018 May  04.92 UT: m1=11.2, Dia.=2.2′, DC=2; 20-cm SCT (133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9. Zodiacal light. Observation made under better conditions, from a higher mountain location, providing a wider coma diameter and brighter m1 estimate in comparison with my previous Apr. 18.94 UT observation]
2018 May  04.48 UT: m1=13.2, Dia.=0.6′, DC=2; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2018 May  03.50 UT: m1=13.1, Dia.=0.9′, DC=3/; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2018 Apr. 19.84 UT: m1=11.2, Dia.=3.0′, DC=3; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 18.94 UT: m1=11.5, Dia.=1.5′, DC=3; 20-cm SCT (100x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1490 m, 42º 54′ N, 5º 49′ W) [Zodiacal light. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Apr. 18.84 UT: m1=11.2, Dia.=2.9′, DC=3; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 17.84 UT: m1=11.2, Dia.=3.0′, DC=3/; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 15.81 UT: m1=11.0, Dia.=3.5′, DC=3/; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 06.81 UT: m1=13.3, Dia.=1.3′, DC=3; 60-cm reflector (244x); Sandor Szabo (Sopron, Hungary)
2018 Apr. 05.86 UT: m1=10.5, Dia.=4′, DC=2/; 20-cm SCT (77x); Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain; Alt. 1190 m , 42º 46′ N, 5º 53′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 21.0]
2018 Mar. 20.86 UT: m1=11.2, Dia.=2.5′, DC=3; 20-cm SCT (100x); Juan Jose Gonzalez (Villacintor, Leon, Spain; Alt. 930 m, 42º 29′ N, 5º 11′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Mar. 18.41 UT: m1=12.4, Dia,=1.3’, DC=2/3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 8.6°; Poor seeing, diffuse and difficult to observe. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Mar. 15.81 UT: m1=11.0, Dia.=3.5′, DC=3/; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Mar. 12.82 UT: m1=11.5, Dia.=2′, DC=3, no tail; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2018 Mar. 12.43 UT: m1=11.6:, Dia.=1.5′, DC=3; 40.0-cm L f/4.5 (75x); Seiichi Yoshida (Ibaraki, Japan)
2018 Mar. 11.41 UT: m1=11.6, Dia.=3’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 11.5°; No enhancement in Swan Band filter. Poor seeing. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Mar. 08.75 UT: m1=10.8, Dia.=5.0′, DC=3; 10-cm B(40x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Mar. 05.79 UT: m1=11.0, Dia.=2.5, DC=2/; 25.4-cm L f:5 (104x); Maik Meyer (Limburg, Germany)
2018 Feb. 17.83 UT: m1=10.5, Dia.=4′, DC=3; 20-cm SCT (100x); Juan Jose Gonzalez (Alto de la Garandilla – Escuredo, Leon, Spain; Alt. 1140 m, 42º 42′ N, 5º 55′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Feb. 15.81 UT: m1=12.2, Dia.=2.0′, DC=3; 30.5-cm L f:5.0 (94x); J. P. Navarro Pina (Sierra de Carrascoy, Murcia, Spain) [NLm=5.5]
2018 Feb. 15.71 UT: m1=11.8, Dia.=1.5′, DC=3; 25-cm (150x); Danil Sidorko (Korenovsk, Russia)
2018 Feb. 15.71 UT: m1=12.5 CCD, Dia.=0.8′, DC=3, Tail= 3.1′ in PA: 81 deg.; 20-cm L + CCD; Danil Sidorko (Korenovsk, Russia)
2018 Feb. 12.84 UT: m1=10.5, Dia.=4′, DC=3; 20-cm SCT (77x); Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain; Alt. 1180 m, 43º 09′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8. It is difficult to separate the contribution of the inner ion tail from that of the coma to the total magnitude m1]
2018 Feb. 10.86 UT: m1=11.6, Dia.=2′, DC=2, no tail; 20-cm SCT (80x); Carlos Labordena (Castellón, España)
2018 Feb. 10.43 UT: m1=12.1, Dia.=2.5’, DC=3/4; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma opaque in centre, interference by stars in coma. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Feb. 08.44 UT: m1=11.6, Dia.=2.5’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 4’ in length in P.A. 094°; Opaque oval shaped inner coma. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 07.44 UT: m1=11.9, Dia.=2.7’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to an opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 06.45 UT: m1=11.4, Dia.=4.8’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 05.45 UT: m1=11.1, Dia.=4.2’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse coma, faint background stars within coma. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Feb. 04.98 UT: m1=11.0, Dia.=2′, DC=2; 22-cm L (160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Jan. 22.50 UT: m1=11.3, Dia.=3.6’, DC=3/4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, diffuse outer coma. Slight moonlight interference. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 20.44 UT: m1=11.2, Dia.=5.7’, DC=4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Close to stars, does not enhance in Swan Band filter. Inner coma elongated to the East approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 19.87 UT: m1=11.0, Dia.=1.7′, DC=5; 60-cm L (187x); Sandor Szabo (Hungary) [Long Tail= 13’ is visible to PA: 100 deg.]
2018 Jan. 19.47 UT: m1=11.3, Dia.=3.8’, DC=3/4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Close to stars, slight interference. Inner coma elongated to the East approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 18.87 UT: m1=10.8, Dia.=4′, DC=2, no tail; 20-cm SCT (80x); Carlos Labordena (Castellón, España)
2018 Jan. 17.92 UT: m1=10.0, Dia.=5′, DC=2/; 20-cm SCT (77x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1350 m, 42º 54′ N, 5º 50′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Jan. 17.79 UT: m1=11.0, Dia.=1.6′, DC=3; 25.4-cm L f:5 (104x); Maik Meyer (Limburg, Germany)
2018 Jan. 17.45 UT: m1=11.4, Dia.=4’, DC=4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter; close to faint stars, slight interference. Inner coma elongated to the East approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 16.77 UT: m1=11.9, Dia.=3.0′, DC=2; 30.5-cm L f:5 (150x); J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2018 Jan. 16.45 UT: m1=11.3, Dia.=5.5’, DC=3/4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Bright star in coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 15.46 UT: m1=11.3, Dia.=3.9’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma elongated to the East approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 14.77 UT: m1=10.9, Dia.=1.5, DC=3; 25.4-cm L f:5 (104x); Maik Meyer (Limburg, Germany)
2018 Jan. 14.45 UT: m1=11.2, Dia.=4.8’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Short broad tail visible 6.3’ in length in P.A. 090° approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 12.43 UT: m1=11.0, Dia.=4.8’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Jan. 10.87 UT: m1=11.5, Dia.=2′, DC=3, no tail; 20-cm SCT (117x); Carlos Labordena (Castellón, España)
2018 Jan. 10.77 UT: m1=11.5, Dia.=2.0′, DC=3; 30.5-cm L (97x); J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2018 Jan. 08.92 UT: m1=10.0, Dia.=5′, DC=2; 20-cm SCT (77x); Juan Jose Gonzalez (Valdespino Cerón, Leon, Spain; Alt. 830 m, 42º 15′ N, 5º 22′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Jan. 07.83 UT: m1=11.0 CCD, Dia.=0.55′, DC=6/, Tail=8′ in PA=89.4 deg.; 0.25-m L f/4.7 + CCD; Sergey Shurpakov (C36, Baran’, Belarus)
2018 Jan. 07.76 UT: m1=10.5, Dia.=4′, DC=3; 11.4-cm L f/6 (45x); Neil Norman FRAS (Ipswich, England)
2018 Jan. 06.771 UT: m1=10.5, Dia=5′, DC=4; 11.4l-cm L f/6 (45x); Neil Norman FRAS (Ipswich, England)
2018 Jan. 06.48 UT: m1=11.1, Dia.=2.6′, DC=5; 40.0-cm L f/4.5 (75x); Seiichi Yoshida (Ibaraki, Japan)
2018 Jan. 05.45 UT: m1=10.7, Dia.=7’, DC=4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Opaque centre, semi-transparent outer coma. Slight interference by mag 3.7 star, 13.5’ away to the NE. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Jan. 04.787 UT: m1=10.5, Dia.=2′, DC=2; 11.4-cm L f/6 (45x); Neil Norman FRAS (Ipswich, England)
2018 Jan. 03.771 UT: m1=10.7, Dia.=1.5′, DC=2; 11.4-cm L f/6 (45x); Neil Norman FRAS (Ipswich, England)
2017 Dec. 27.86 UT: m1=10.8 DSLR, Dia.=4′; 3.4-cm A + DSLR V, f/4 (1200s); Mieczyslaw Leszek Paradowski (Lublin, Poland) [Cat. UCAC4 (7 solar type comp. stars); m1 measured using Infinite Aparture Method – Error +/-0.1 mag; Moonlight (66% of full); comet alt.+51deg.]
2017 Dec. 23.91 UT: m1=11.7, Dia.=1.5′, DC=3, no tail; 20-cm SCT (117x); Carlos Labordena (Castellón, España)
2017 Dec. 23.59 UT: m1=11.2, Dia.=3.5’, DC=3/4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Interference by faint stars in coma; Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Dec. 20.13 UT: m1=10.2, Dia.=5′, DC=2/; 20-cm SCT (77x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3. It is difficult to separate the contribution of the inner ion tail from that of the coma to the total magnitude m1]
2017 Dec. 19.45 UT: m1=11.0, Dia.=2.6′, DC=3; 40.0-cm L f/4.5 (75x); Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 18.72 UT: m1=11.5, Dia.=2.3′, DC=3; 40.0-cm L f/4.5 (75x); Seiichi Yoshida (Ibaraki, Japan)
2017 Dec. 16.87 UT: m1=12.1, Dia.=1.5′, DC=2, no tail; 20-cm SCT (117x); Carlos Labordena (Castellón, España)
2017 Dec. 16.14 UT: m1=10.1, Dia.=5′, DC=2; 20-cm SCT (77x); Juan Jose Gonzalez (Villacintor, Leon, Spain; Alt. 930 m, 42º 29′ N, 5º 11′ W) [Increasing activity. It is difficult to separate the contribution of the inner ion tail from that of the coma to the total magnitude m1. Field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2017 Dec. 15.08 UT: m1=12.3, Dia.=1′, DC=4; 22-cm L (160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Dec. 14.66 UT: m1=10.8, Dia.=3.8’, DC=3/4; 25cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Tail visible 5’ in length in P.A. 100° approximately. coma does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Dec. 13.89 UT: m1=12.1 CCD, Dia.=1.18′, DC=6/; 0.25-m f/4.7 reflector + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Dec. 13.60 UT: m1=11.0, Dia.=3.2’, DC=4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Tail visible 5.6’ in length in P.A. 358° approximately, semi-transparent; Interference by star pair in coma. Coma dims in Swan band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Dec. 11.39 UT: m1=11.4, Dia.=1.8′, DC=3; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Gunma, Japan)
2017 Dec. 07.45 UT: m1=11.2, Dia.=2’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Coma appears elongated to the West approximately. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Dec. 06.80 UT: m1=11.7, Dia.=1.5′, DC=3; 30.5-cm L (250x); J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain)
2017 Nov. 26.17 UT: m1=11.1, Dia.=2.5′, DC=3; 20-cm SCT (133x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.2]
2017 Nov. 24.75 UT: m1=12.6, Dia.=1.4′, DC=4; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Gunma, Japan)
2017 Nov. 24.67 UT: m1=12.3, Dia.=2.4’, DC=3; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma pale blue in colour and diffuse with an opaque centre, appears elongated to the NW approximately. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Nov. 22.92 UT: m1=11.9, Dia.=1.2′, DC=5; 60-cm L (244x); Sandor Szabo (Hungary)
2017 Nov. 16.18 UT: m1=11.7, Dia.=1.3′, DC=3/; 20-cm SCT (133x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 20.9]
2017 Nov. 14.89 UT: m1=13.4, Dia.=0.4′, DC=5; 60-cm L (244x); Sandor Szabo (Hungary)
2017 Nov. 14.19 UT: m1=11.8, Dia.=1.3′, DC=3; 20-cm SCT (133x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1490 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.0]
2017 Nov. 14.14 UT: m1=12.8, Dia.=1′, DC=3; 22-cm L (160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Nov. 09.49 UT: m1=12.9, Dia.=1’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult due to glare from bright star at edge of field. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Oct. 30.69 UT: m1=12.8, Dia.=2’, DC=2/3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, interference from mag 12.8 star in coma; Slight brightening to centre, does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Oct. 27.99 UT: m1=13.5, Dia.=0.7′, DC=1-2; 0.40-m Dobsonian f/4.4 (200x); Gabor Santa (Göd, Hungary) [Diffuse. Close (6′) to Berkeley 20 open clulster which was brighter and bigger]
2017 Oct. 26.68 UT: m1=13.2, Dia.=0.7′, DC=3/; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2017 Oct. 03.20 UT: m1=13.2, Dia.=1.1′, DC=3; 20-cm SCT (133x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.0]
2017 Sep. 27.61 UT: m1=13.9, Dia.=0.6’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, small. Visible in periods of good seeing. Slight haze from dust and bushfire smoke. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 25.73 UT: m1=14.0, Dia.=0.6′, DC=3; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2017 Sep. 21.75 UT: m1=13.8, Dia.=0.9’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, slight brightening to centre. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]

C/2016 N6 (PANSTARRS)
2019 Apr. 07.40 UT: m1=14.2, Dia.=0.6’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult, small, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Feb. 04.46 UT: m1=13.0, Dia.=1.4’, DC=3/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Close to star, diffuse inner coma, faint stellar central condensation in good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Jan. 14.65 UT: m1=13.4, Dia.=0.7’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Diffuse and small. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Jan. 12.57 UT: m1=13.8, Dia.=1.1’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Busy star field. Small and diffuse. Comparison stars checked using APASS data in Guide 9.0. Method= S. Cat= AQ]
2018 Dec. 31.64 UT: m1=11.9, Dia.=1.5′, DC=4; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 28.47 UT: m1=13.0, Dia.=1.3’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Sometimes faintly stellar, diffuse outer coma, close to star. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Dec. 27.47 UT: m1=12.3, Dia.=1.3’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, difficult due to busy star field. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Dec. 14.08 UT: m1=11.5, Dia.=2.5′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain. Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. APASS comparison stars. SQM: 21.0]
2018 Dec. 09.27 UT: m1=12.3, Dia.=1′, DC=3; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 01.76 UT: m1=12.6, Dia.=1.1′, DC=3; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.67 UT: m1=12.3, Dia.=1.0′, DC=3/; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 29.51 UT: m1=12.6, Dia.=2’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse, weakly condensed. Low altitude= 10.0°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 14.08 UT: m1=13.2, Dia.=0.7′, DC=6; 60-cm L(187x); Sandor Szabo (Sopron, Hungary)
2018 Nov. 11.71 UT: m1=13.0, Dia.=1.2’, DC=3/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Small and very diffuse, moderately condensed centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 10.66 UT: m1=13.0, Dia.=1.3’, DC=3/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Sometimes appears stellar. Diffuse and evenly illuminated coma with a slightly brighter central condensation. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 05.09 UT: m1=12.8, Dia.=1′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [metod S, Lm=6.48]
2018 Nov. 03.75 UT: m1=11.9, Dia.=1.9′, DC=5; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 21.07 UT: m1=12.3, Dia.=1′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.75]
2018 Oct. 20.19 UT: m1=11.8, Dia.=2.5′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.0]
2018 Oct. 17.08 UT: m1=12.6, Dia.=1′, DC=2/; 25.4-cm L(190.5x); Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 Oct. 13.07 UT: m1=13.5 CCD, Dia.=0.45′, DC=7/; 0.20-m f/4 Schmidt-Newton + CCD; S. Shurpakov (Observatory A98, Belarus)
2018 Oct. 07.73 UT: m1=13.2, Dia.=0.8′, DC=5/; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.78 UT: m1=12.9, Dia.=0.8′, DC=6; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 June 12.95 UT: m1=11.7, Dia.=1.5′, DC=4; 20-cm SCT (133x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. APASS comparison stars. SQM: 21.1. Altitude: 14 deg.]
2018 May  15.97 UT: m1=11.6, Dia.=2.0′, DC=4; 20-cm SCT (133x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 May  08.92 UT: m1=11.8, Dia.=1.7′, DC=5; 20-cm SCT (100x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. APASS comparison stars. SQM: 21.2]
2018 May  08.89 UT: m1=12.2, Dia.=1.5′, DC=4/; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia)
2018 May  06.85 UT: m1=12.7, Dia.=2.0′, DC=6; 30.5-cm L (94x); J. P. Navarro Pina (Puerto de la Cadena, Murcia, España)
2018 May  04.90 UT: m1=11.9, Dia.=1.2′, DC=5; 20-cm SCT (100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 May  04.57 UT: m1=12.7, Dia.=1.1′, DC=5; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Gunma, Japan)
2018 May  03.51 UT: m1=12.3, Dia.=1.4′, DC=5; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Gunma, Japan)
2018 Apr. 19.86 UT: m1=12.5, Dia.=0.9′, DC=4; 20-cm L f:4 (106x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 18.89 UT: m1=12.1, Dia.=1.0′, DC=5; 20-cm SCT (100x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1490 m, 42º 54′ N, 5º 49′ W) [Sidgwick method. APASS comparison stars. SQM: 21.0]
2018 Apr. 18.86 UT: m1=12.5, Dia.=1.1′, DC=4/; 20-cm L f:4 (106x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 17.86 UT: m1=12.5, Dia.=1.0′, DC=4; 20-cm L f:4 (106x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 08.93 UT: m1=12.6, Dia.=1′, DC=2; 25-cm L(105x); Valentín Díaz (La Romaneta, Alicante, España)
2018 Apr. 06.87 UT: m1=12.8, Dia.=1.5′, DC=6; 60-cm reflector (187x); Sandor Szabo (Sopron, Hungary)
2018 Apr. 05.90 UT: m1=12.0, Dia.=1.2′, DC=5; 20-cm SCT (133x); Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain; Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. APASS comparison stars. SQM: 21.5]
2018 Mar. 20.89 UT: m1=12.0, Dia.=1.2′, DC=5; 20-cm SCT (100x); Juan Jose Gonzalez (Villacintor, Leon, Spain; Alt. 930 m, 42º 29′ N, 5º 11′ W) [Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 Mar. 12.45 UT: m1=12.7, Dia.=1.1′, DC=6; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Ibaraki, Japan)
2018 Feb. 17.86 UT: m1=12.1, Dia.=1.2′, DC=5; 20-cm SCT (100x); Juan Jose Gonzalez (Alto de la Garandilla – Escuredo, Leon, Spain; Alt. 1140 m, 42º 42′ N, 5º 55′ W) [Sidgwick method. APASS comparison stars. SQM: 21.0. Field stars checked in DSS]
2017 Dec. 18.80 UT: m1=14.2, Dia.=0.5′, DC=5; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Ibaraki, Japan)
2017 Nov. 16.23 UT: m1=13.5, Dia.=0.5′, DC=4; 20-cm SCT (206x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.1]
2017 Nov. 14.77 UT: m1=[14.5; 60-cm L (187x); Sandor Szabo (Hungary) [Very close to two 12.7 mag stars, something is there, but NEGATIVE]
2017 Nov. 14.71 UT: m1=14.3, Dia.=0.4′, DC=3-4; 0.40-m L f/4.4 (360x); Gabor Santa (Göd, Hungary) [comet was seen well, round, with some condensation. 27 deg above horizon, nelm=4.5-5.0]
2017 Sep. 22.80 UT: m1=13.7, Dia.=0.7’, DC=3; 60-cm reflector (244x); Sandor Szabo (Sopron, Hungary)
2017 Aug. 18.99 UT: m1=15.0; Dia.=0.35′, DC=0/; 0,60-m L (305x); Gabor Santa (Hungary) Checked on a photo taken on the same night and same location by Ákos Nagy Mélykuti.
2017 Apr. 04.95 UT: m1=17.3 CCD, Dia.=0.33′, DC=8/; 0.25-m f/4.7 reflector + CCD; Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 17.01 UT: m1=17.4 CCD, Dia.=0.28′, DC=8; 0.25-m f/4.7 reflector + CCD; S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2016 N4 (MASTER) C2016N4_Mag
2019 Apr. 05.90 UT: m1=18.0 CCD, Dia.=0.27′, DC=2/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2017 Nov. 14.80 UT: m1=15.5; 60-cm L (187x); Sandor Szabo (Hungary) [tried to see for half and hour, but NEGATIVE, must be fainter than 15.5 mag]
2017 Nov. 14.73 UT: m1=14.8, Dia.=0.35′ (20″), DC=0-1; 0.40-m L f/4.4 (360x); Gabor Santa (Göd, Hungary) [comet is very dim but obvious, round, without condensation. 64 deg above horizon, nelm=5.6]
2017 Oct. 26.65 UT: m1=14.5, Dia.=0.3′, DC=4; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2017 Oct. 13.88 UT: m1=13.7, Dia.=0.5′, DC=4; 20-cm SCT (206x); Juan Jose Gonzalez (Alto del Castro – Aralla, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.1]
2017 Oct. 13.79 UT: m1=14.6, Dia.=0.4-0.5′, DC=3-4; 0.40-m Dobsonian f/4.4 (257x); Gabor Santa (Göd, Hungary) [relatively big and diffuse, difficult to see]
2017 Sep. 25.71 UT: m1=14.6, Dia.=0.3′, DC=3; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2017 Sep. 22.84 UT: m1=15.7, Dia.=0.4’, DC=2; 60-cm reflector (305x); Sandor Szabo (Sopron, Hungary) [A 16.5 mag starlike nucleus is seen. Motion was checked during 20 minutes]
2017 Aug. 21.94 UT: m1=14.8, Dia.=0.4′, DC=0; 0.35-m L (351x); Gabor Santa (Hungary) [Bit difficult to see, but I’m sure its real. Movig was detected in a half an hour period. 15,4 mag stars were visible. In this night I got a clear view about NGC 7009 (Saturn nebula) with its lobes, and also about Campbell’s Hydrogen Star, which had really, very-very red colour!]
2017 July 30.93 UT: m1=16.3 CCD, Dia.=0.22′, DC=8; 25-cm reflector f/4.7; Sergey Shurpakov (Baran’, Belarus)
2016 Oct. 31.78 UT: m1=15.8, Dia.=0.25′, DC=4: 60-cm L (305x); Sandor Szabo (Sopron, Hungary)
2016 Sep. 01.01 UT: m1=15.3, Dia.=0.25′, DC=5; 60-cm L (407x); Sandor Szabo (Hungary)
2016 Aug. 27.01 UT: m1=16.5 CCD, Dia.=0.40′, DC=7/; 20-cm L f/4 + CCD; Sergey Shurpakov (A98, Baran’, Belarus)

C/2016 M1 (PANSTARRS)
2019 Aug. 08.78 UT: m1=14.8, Dia.=0.4’, DC=2; 40-cm L(261x); Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Aug. 03.76 UT: m1=15.0, Dia.=0.4’, DC=3; 40-cm L f:4.5(261x); Chris Wyatt (Walcha, NSW, Australia) [Small and difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 May  30.36 UT: m1=13.4, Dia.=1.3’, DC=2; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffused. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 May  06.41 UT: m1=12.9, Dia.=1.5’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse and difficult. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Apr. 28.39 UT: m1=12.7, Dia.=1.3’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Apr. 07.41 UT: m1=12.8, Dia.=1.7’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Close to stars. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Mar. 04.40 UT: m1=11.2, Dia.=4.5’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight interference from background star in coma. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Feb. 11.68 UT: m1=11.5, Dia.=2.5’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 17.8°. Moderately condensed centre, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 09.67 UT: m1=11.7, Dia.=2.6’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Faint star in coma. Coma very diffuse and weakly condensed. Low altitude= 18.7°. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 04.45 UT: m1=11.1, Dia.=4.7’, DC=5; 25-cm L f:5(40x); Chris Wyatt (Walcha, NSW, Australia) [Close to star, diffuse inner coma, faint stellar central condensation in good seeing. First comet with new 31mm Nagler Type V eyepiece. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 03.43 UT: m1=10.8, Dia.=4.2’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre, moderately condensed. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Jan. 14.68 UT: m1=10.9, Dia.=4’, DC=5; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, well condensed. Background star in coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Jan. 12.58 UT: m1=10.3, Dia.=4.3’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Bright star on coma edge, faint 12th mag star in coma. Coma diffuse, opaque and well condensed centre. Enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Dec. 29.45 UT: m1=10.6, Dia.=4.0’, DC=4/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Small opaque centre, fading to edges. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Dec. 28.45 UT: m1=10.4, Dia.=3.8’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Close to star, moderately condensed opaque centre, transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Dec. 27.46 UT: m1=10.8, Dia.=3.5’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Slight interference from faint background stars, dims slightly in Swan band filter. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Dec. 07.43 UT: m1=10.6, Dia.=3.7’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 29.47 UT: m1=10.5, Dia-=3.4’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre with faint stellaring visible in good seeing. Low altitude= 18.8°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 26.44 UT: m1=10.8, Dia.=3’, DC=6; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus. Diffuse semi-transparent inner coma fades to transparent outer coma. Low altitude= 19.2°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 11.69 UT: m1=10.7, Dia.=3.2’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, inner coma moderately condensed. Dims slightly in Swan Band. Low altitude= 16.9°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 10.65 UT: m1=10.6, Dia.=2.5’, DC=4/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, central condensation moderately condensed. Semi-transparent outer coma. Dims slightly in Swan Band filter.Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 08.46 UT: m1=10.5, Dia.=3.2’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Close to star. Outer coma tenuous with an opaque but weakly condensed centre. Low altitude = 14.8°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 03.39 UT: m1=10.4, Dia.=1.7’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Close to faint stars, moderately condensed and opaque centre surrounded by semi-transparent haze. Slight twilight interference. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 30.40 UT: m1=10.3, Dia.=3.8’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Star in coma, coma centre opaque. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 29.43 UT: m1=10.4, Dia.=3.8’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 17.7°; Small opaque centre, moderately condensed, diffuse outer coma.Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 27.39 UT m1=10.5, Dia.=2.8’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter. Diffuse coma, opaque centre but weakly condensed. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 19.40 UT: m1=11.1, Dia.=1.7’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Very diffuse outer coma, small and well condensed opaque inner coma, stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 12.94 UT: m1=10.3, Dia.=2.5′, DC=4; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 08.41 UT: m1=10.2, Dia.=2.3’, DC=4/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, enhances in Swan Band filter. Moderately condensed centre. Busy star field, visible at x39 but best with x83. Poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 01.40 UT: m1=10.2, Dia.=2.8’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, semi-transparent. Moderately condensed opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 27.38 UT: m1=10.5, Dia.=2.5’, DC=4; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma centre moderately condensed and opaque, fading to edges. Enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 10.38 UT: m1=9.8, Dia.=3.5’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Sky slightly hazy with dust/smoke in upper atmosphere. No tail. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Sep. 09.94 UT: m1=10.1, Dia.=3′, DC=4; 22-cm L (60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Sep. 09.40 UT: m1=9.6, Dia.=4.9’, DC=4/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Cooma enhances in Swan Band filter. Faint outer coma, gradually brightens to a well condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Sep. 08.38 UT: m1=9.7, Dia.=4.8’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque centre, sometimes stellar. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Sep. 07.40 UT: m1=9.8, Dia.=3.2’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Close to star pairing on edge of coma, coma enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Sep. 05.52 UT: m1=9.7, Dia.=3; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia)
2018 Aug. 29.37 UT: m1=9.8, Dia.=2.9’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Faint stars on NE edge of coma, enhances well in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 15.06 UT: m1=9.0, Dia.=4′, DC=4; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [method S]
2018 Aug. 14.47 UT: m1=9.1, Dia.=6’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Transparent outer coma, brightening to a well condensed opaque centre, pale-aqua blue in colour. Faintly stellar in periods of good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 13.37 UT: m1=9.1, Dia.=3.8’, DC=5; 25-cm L f:5(x39); Chris Wyatt (Walcha, NSW, Australia) [Star on the Western edge of coma. Faint, short tail to the East approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 11.21 UT: m1=9.0, Dia.=4’, DC=3; 29-cm SCT(87.5x); Alberto Anunziato (Oro Verde, Argentina) [Mét. Sidgwick, Cat. Tycho II]
2018 Aug. 10.08 UT: m1=9.0, Dia.=4′, DC=5; 22-cm L (60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Method: S]
2018 Aug. 10.07 UT: m1=8.9, Dia.=4′, DC=4/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Method: S]
2018 Aug. 08.38 UT: m1=8.7; Dia.=5.4’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Faint stars in coma, well condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 06.58 UT: m1=8.8; Dia.=6’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Short, faint broad tail visible, traced to 5’ in length in P.A. 098°. Large transparent outer coma gradually brightening to a well condensed centre. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 02.36 UT: m1=8.9, Dia.=6.9’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Faintly stellar, opaque inner coma, transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 01.36 UT: m1=8.8:, Dia.=5.1’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain due to interference by star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Aug. 01.35 UT: m1=8.9, Dia.=4; 25×100 B; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia) [Marginally enhanced through Swan Band filter]
2018 July 30.36 UT: m1=8.7, Dia.=4.8’, DC=5/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma appears elongated to the East approximately, coma centre well condensed, opaque, pale aqua-blue in colour and sometimes appears stellar in good seeing. Enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2018 July 20.72 UT: m1=8.6, Dia.=5’, DC=5/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Short, faint broad tail visible to the East approximately. Low altitude = 15.2°. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M. Cat= TK]
2018 July 20.17 UT: m1= 8.8, Dia.=6′, DC=4; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 July 18.72 UT: m1=9.1, Dia.=3.5’, DC=5/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Faint star in coma. Coma diffuse, semi-transparent inner coma. Faint broad tail visible, traced to 6.3’ in length in P.A. 040°. Low altitude= 16.0°. Comparison stars checked using Tycho-2 data in Guide 9.0. Method= M. Cat= TK]
2018 July 16.42 UT: m1=9.0, Dia.=3.5’; DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Busy star field, close to stars. Transparent outer coma, opaque inner coma. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2018 July 15.97 UT: m1=8.8, Dia.=3′, DC=5; 10-cm-R f/5 (34x); Willian Souza (Sao Paulo, Brazil)
2018 July 15.14 UT: m1=8.7, Dia.=6′, DC=4/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 July 13.71 UT: m1=8.7, Dia.=3.5’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small faint stellar centre, faint star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 July 12.47 UT: m1=8.7, Dia.=5.4’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Short, broad transparent tail visible to NE approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 July 11.73 UT: m1=8.7, Dia.=5.1’, DC=5/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, opaque centre, well condensed, appears faintly stellar in good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 July 08.38 UT: m1=8.3, Dia.=5.6’, DC=5/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse at edges, brightening gradually to opaque centre, well condensed. Faint transparent and slightly curved tail visible, traced to 5’ in length in P.A. 040° approximately. Convex side to the East. Comparison stars checked using Tycho-2 data in Guide 9.0;,Method= M, Cat= TK]
2018 July 06.51 UT: m1=8.5, Dia.=5.3’, DC=5/; 25cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) {Faint, broad transparent tail visible, traced to 5’ in length in P.A.045° approximately. Coma diffuse with well condensed opaque centre, faintly stellar in good seeing. Coma enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK}
2018 July 06.12 UT: m1=8.4, Dia.=6′, DC=4/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 July 04.50 UT: m1=9.0, Dia.=4.0′, DC=4; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia) [Possibly slightly fainter using Swan Band filter. Appeared a little less condensed through filter]
2018 July 04.36 UT: m1=8.5, Dia.=4.8’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Faint, broad transparent tail visible, traced to 6’ in length in P.A.030° approximately. Well condensed centre, pale-aqua blue in colour. Enhances slightly in Swan Band filter. Globular cluster NGC 6352 in field. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 July 04.06 UT: m1=8.5, Dia.=6′, DC=4; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 June 23.74 UT: m1=8.6, Dia.=6’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) ]Broad faint tail visible, traced to 4.7’ in length in P.A. 348° approximately. Stellar central condensation, opaque centre. Observed from 1250m altitude, SQM reading of 21.8 taken as an average over 5 readings near zenith. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 June 22.74 UT: m1=8.7, Dia.=4.2’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 6.4’ in length in P.A. 0.3° approximately. Slight interference from field star. Faint stellar central condensation, opaque centre. Enhances in Swan Band filter, pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2018 June 22.05 UT: m1=8.9, Dia.=3′, DC=5; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [moonlight]
2018 June 21.06 UT: m1=8.9, Dia.=4′, DC=4; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 June 19.05 UT: m1=7.7, Dia.=10′, DC=3; 10×50 B; Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 10 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8. Observation made under better conditions, from a higher mountain location, providing a wider coma diameter and brighter m1 estimates in comparison with my previous June 13 observation]
2018 June 19.05 UT: m1=7.9, Dia.=8′, DC=3/; 25×100 B; Juan Jose Gonzalez (Alto del Castro, Leon, Spain)
2018 June 19.05 UT: m1=8.3, Dia.=6′, DC=4, Tail= 0.3 deg. in PA: 350 deg.; 20-cm SCT (77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain)
2018 June 19.05 UT: m1=8.6, Dia.=6′, DC=4/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 June 19.02 UT: m1=8.4, Dia.=4′, DC=3/; 25-cm L F/4.5 (66x); Gonzalo Vargas (Cochabamba, Bolivia) [Observation with some Moon light interference]
2018 June 18.05 UT: m1=8.7, Dia.=5′, DC=4/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 June 17.04 UT: m1=8.7, Dia.=4′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 June 16.96 UT: m1=8.7, Dia.=3.9′, DC=5; 25-cm L(65x); Valentín Díaz (Puebla de Don Fadrique, Granada, España)
2018 June 16.03 UT: m1=8.8, Dia.=4.5′, DC=4/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 June 15.95 UT: m1=8.5, Dia.=5′, DC=6; 30.5-cm L F/5.0 (94x); J. P. Navarro Pina (Puerto de la Cadena, Murcia, Spain) [h=8º comet low horizont , corrected magnitude by atmospheric extinction NeLM=5.7]
2018 June 14.07 UT: m1=8.9, Dia.=3′, DC=4; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 June 13.72 UT: m1=8.8, Dia.=5.4’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Faint transparent tail visible 5.9’ in length in P.A. 322° approximately. Well condensed centre pale aqua-blue in colour, not quite stellar. Coma enhances in Swan Band filter. Faintly visible in 7×50 binoculars. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2018 June 13.06 UT: m1=8.3, Dia.=6′, DC=3/; 25×100 B; Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Altitude: 14 deg. In 20-cm SCT (77x) : m1=8.8, Dia.=4′, DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 June 12.71 UT: m1=8.8, Dia.=6’, DC=5/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma slightly enhances and inner coma dims using Swan Band filter. Opaque well condensed centre, appears pale aqua in colour. Faint stars in coma. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2018 June 10.36 UT: m1=8.9, Dia.=4′, DC=5; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 June 10.05 UT: m1=9.0, Dia.=2′, DC=5; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 June 09.03 UT: m1=9.0, Dia.=2′, DC=5; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 June 09.01 UT: m1=9.0, Dia.=4′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 June 08.35 UT: m1=9.3, Dia.=4′, DC=5; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 June 08.33 UT: m1=8.9, Dia.=3′, DC=5; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 June 07.05 UT: m1=9.0, Dia.=2′, DC=5; 9cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [close to star TYC 6885-1224-1]
2018 June 06.32 UT: m1=9.0, Dia.=4′, DC=5; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 June 06.07 UT: m1=9.1, Dia.=4′, DC=4; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 June 04.44 UT: m1=8.9, Dia.=3.3’, DC=4/5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma extended to the West approximately, faint star in coma. Opaque, moderately condensed centre. At x83 the centre appears stellar. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2018 June 04.27 UT: m1=9.0, Dia.=4′, DC=4; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 June 04.05 UT: m1=9.0:; 9-cm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [close to star TYC 6882-2034-1]
2018 May  30.14 UT: m1=9.5:; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [moonlight]
2018 May  29.36 UT: m1=9.6:, DC=4; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [moonlight]
2018 May  28.36 UT: m1=9.5, Dia.=2′, DC=5; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 May  27.46 UT: m1=9.4, Dia.=3′, DC=4; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 May  27.36 UT: m1=9.6, Dia.=1′, DC=5; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 May  25.72 UT: m1=9.6:, Dia.=2.9’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain due to interference by mag 10.2 star near centre of coma. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  25.28 UT: m1=9.4, Dia.=2.4’, DC=4; 25-cm L f:4.5 (75x); Gonzalo Vargas (Cochabamba, Bolivia) [Se observó ligera coloración verde agua de la coma, se experimentó alguna interferencia de luz de la Luna, se usaron las estrellas SAO 188147 (8.6) y GSC 63051137 (9.6) para estimar magnitud del cometa, se usó método de desenfoque]
2018 May  24.46 UT: m1=9.1, Dia.=4′, DC=4; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 May  24.36 UT: m1=9.8, Dia.=1′, DC=5; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 May  22.72 UT: m1=9.6, Dia.=4.2’, DC=5/6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, pale-aqua blue opaque centre. Coma enhances in Swan Band filter, inner coma dims. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  22.46 UT: m1=9.1, Dia.=3′, DC=5; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 May  22.36 UT: m1=9.8, Dia.=1′.5, DC=5; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [close to star TYC 6302-2472-1]
2018 May  21.72 UT: m1=10.0, Dia.=5’, DC=5/6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Close to stars, centre opaque, faintly stellar. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  21.36 UT: m1=9.8:, Dia.=1′, DC=5/; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil) [close to star GSC 6302-1087]
2018 May  21.07 UT: m1=8.9, Dia.=5′, DC=3/; 25×100 B; Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 20-cm SCT (77x) : m1=9.1, Dia.=5′, DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 May  20.31 UT: m1=9.7, Dia.=4′, DC=4/; 22-cm L (60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 May  20.09 UT: m1=9.6, Dia.=4′, DC=4, no tail; 20-cm SCT(50x); Carlos Labordena (Castellón, España)
2018 May  19.72 UT: m1=10.2, Dia.=4.7’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma, inner coma opaque with faint stellar central condensation. Outer coma enhances in Swan Band filter, inner coma disappears making the coma appear more uniform in brightness. Hint of dust tail within the coma extending to NW approximately. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  18.73 UT: m1=10.2, Dia.=3.5’, DC=5; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Close to nearby stars; Coma diffuse, slightly elongated to WSW approximately. Enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 May  18.46 UT: m1=9.6, Dia.=3′, DC=4; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 May  16.02 UT: m1=9.0, Dia.=4′, DC=3; 20-cm SCT (100x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2018 May  15.46 UT: m1=9.6, Dia.=4′, DC=5; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 May  15.24 UT: m1=9.8, Dia.=2.5’, DC=4; 25-cm L f:4.5 (75x); Gonzalo Vargas (Cochabamba, Bolivia) [Se nota coloración azulada de la coma, también se aprecia un ligero alargamiento de la coma al oeste, se usaron estrellas SAO 162817 (9.3) y GSC 5735817(10.8) para estimar magnitud del cometa]
2018 May  15.17 UT: m1=10.1:, Dia.=0′.5, DC=5; 9-cmm f/10 (36x); Alexandre Amorim (Florianopolis, Brazil)
2018 May  13.14 UT: m1=9.6, Dia.=4′, DC=4, no tail; 20-cm SCT(50x); Carlos Labordena (Castellón, España)
2018 May  12.46 UT: m1=9.9:, Dia.=4′, DC=5; 30×125 B; Carl Hergenrother (Tucson, AZ, USA)
2018 May  10.62 UT; m1=10.0, Dia=3.2’, DC=6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma enhances in Swan Band filter, inner coma dims. Coma elongated to the West approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ}
2018 May  09.59 UT: m1=10.1, Dia.=4.7’, DC= 6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Transparent outer coma enhances in Swan band filter while the faintly stellar and opaque central condensation dims. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 May  09.17 UT: m1=10.6, Dia.=2.5′, DC=3; 22-cm L (60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [little enhancement with comet filter ]
2018 May  09.09 UT: m1=9.3, Dia.=5′, DC=3; 20-cm SCT (77x); Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Sidgwick method. Tycho-2 comparison stars. SQM : 20.7. Before moonrise. Altitude: 24 deg.]
2018 May  08.00 UT: m1=10.4, Dia.=1′, DC=3; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia)
2018 May  03.76 UT: m1=10.5, Dia.=1.7′, DC=4; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Gunma, Japan)
2018 Apr. 22.27 UT: m1=10.8, Dia.=2′, DC=4; 22-cm L (160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Apr. 20.69 UT: m1=10.5, Dia.=3.8’, DC=5/6; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter; Central condensation sometimes appears stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 20.09 UT: m1=10.5, Dia.=5.5′, DC=3/; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 19.09 UT: m1=9.9, Dia.=4′, DC=3; 20-cm SCT (77x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Apr. 19.08 UT: m1=10.5, Dia.=5.5′, DC=3; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 18.08 UT: m1=10.6, Dia.=5.0′, DC=3/; 20-cm L f:4 (42x); Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 17.14 UT: m1=10.8, Dia.=2.5′, DC=3, no tail; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2018 Apr. 16.73 UT: m1=11.2, Dia.=2.2’, DC=5/6; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma does not appear to enhance in Swan Band filter; Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 15.71 UT: m1=11.4, Dia.=2.7’, DC=5/6; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter; Opaque centre, moderately condensed, hints of stellaring in periods of good seeing, outer coma diffused and appears fanned to the North. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 14.67 UT: m1=11.6, Dia.=2’, DC=4/5; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter, Inner coma opaque, moderately condensed, no tail. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 11.66 UT: m1=11.3, Dia.=2.3’, DC=4; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, Inner coma opaque and moderately condensed. Does not appear to enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Mar. 27.17 UT: m1=11.1, Dia.=1.5′, DC=3, no tail; 20-cm SCT(80x); Carlos Labordena (Castellón, España)
2018 Mar. 24.70 UT: m1=12.0, Dia.=1.3’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Interference from background stars, diffuse coma with opaque centre. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Mar. 24.33 UT: m1=11.3, Dia.=1.5′, DC=3; 22-cm L (160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [near star with m1:11.47]
2018 Mar. 18.72 UT: m1=11.8; Dia.=1.3’, DC=5/6; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, coma diffuse with a small and opaque centre that is sometimes stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Feb. 21.23 UT: m1=11.0, Dia.=3′, DC=2/; 20-cm SCT (133x); Juan Jose Gonzalez (Villacintor, Leon, Spain; Alt. 930 m, 42º 29′ N, 5º 11′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1. Altitude: 24 deg.]
2017 Nov. 14.75 UT: m1=14.0, Dia.=0.5′, DC=3; 60-cm L (244x); Sandor Szabo (Hungary) [Very close to a 13.9 mag star, but easily seen]
2017 Nov. 14.70 UT: m1=13.7, Dia.=0.6′, DC=d4-5; 0.40-m L f/4.4 (360x); Gabor Santa (Göd, Hungary) [comet is easy to see, round, with disk-like condensation. 32 deg above horizon, nelm=5.0]
2017 Oct. 26.40 UT: m1=[13.9; 40.0-cm L f/4.5 (257x); Seiichi Yoshida (Gunma, Japan)
2017 Oct. 13.77 UT: m1=14.0, Dia.=0.5′, DC=3-4; 0.40-m Dobsonian f/4.4 (257x); Gabor Santa (relatively big and diffuse, difficult to see Hungary) [easy to see]
2017 Sep. 22.82 UT: m1=14.5, Dia.=0.5’, DC=5; 60-cm reflector (305x); Sandor Szabo (Sopron, Hungary)
2017 Aug. 21.83 UT: m1=14.8, Dia.=0.33′, DC=0; 0.35-m L (351x); Gabor Santa (Hungary) [Coma is diffuse but very obvious]
2017 Apr. 20.00 UT: m1=16.7 CCD, Dia.=0.20′, DC=7/; 0.25-m f/4.7 reflector + CCD; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Apr. 04.99 UT: m1=16.8 CCD, Dia.=0.37′, DC=7/; 0.25-m f/4.7 reflector + CCD; Serguey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 16.99 UT: m1=16.8 CCD, Dia.=0.28′, DC=8; 0.25-m f/4.7 reflector + CCD; S. Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 13.99 UT: m1=16.8 CCD, Dia.=0.37′, DC=8/; 0.25-m f/4.7 reflector + CCD; S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2016 A1 (PANSTARRS)  c2016a1_mag
2019 Apr. 27.02 UT: m1=17.9 CCD, Dia.=0.19′, DC=8/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2018 Jan. 19.93 UT: m1=15.3, Dia.=0.3′, DC=4; 60-cm L (406x); Sandor Szabo (Hungary)
2018 Jan. 09.01 UT: m1=16.1 CCD, Dia.=0.30′, DC=8; 0.25-m L f/4.7 + CCD; Sergey Shurpakov (C36, Baran’, Belarus)
2017 Dec. 13.98 UT: m1=16.7 CCD, Dia.=0.18′, DC=8; Sergey Shurpakov (Observatory C36, Baran’, Belarus)
2017 Mar. 26.85 UT: m1=16.2, Dia.=0.2′, DC=5; 60-cm L (407x); Sandor Szabo (Hungary) [Motion was checked]
2017 Feb. 25.88 UT: m1=16.7 CCD, Dia.=0.29′, DC=8/; 0.25-m f/4.7 reflector + CCD; S. Shurpakov (Observatory C36, Baran’, Belarus)

C/2014 S2 (PANSTARRS) Light Curve

 Fórmula Preperihélica: m = -5.7 + 5 log d + 40.4 log r / Fórmula Postperihélica m = 3.7 + 5 log d + 11.0 log r

Curva de Luz Visual Pre y Post perihélica del C/2014 S2 (PANSTARRS). Magnitud Heliocéntrica (Helio Mag) versus Distancia al Sol (r) sobre observaciones aportadas a la Sección Cometaria de la LIADA. Fórmula Preperihélica: m = -5.7 + 5 log d + 40.4 log r / Fórmula Postperihélica m = 3.7 + 5 log d + 11.0 log r

C/2014 Q2 (Lovejoy)  C2014Q2_Mag  Light Curve

LC_2014Q2_LIADA_2015Nov17

C/2014 E2 (Jacques) Light Curve

Curva de Luz (Mag. heliocéntrica vs Log R) Visual del Cometa C/2014 E2 (Jacques) al 9 de Mayo de 2015. / H0: 6.8, n: 4.2 / LIADA Sección Cometas.

C/2014 E2 (Jacques) Curva de Luz (Mag. heliocéntrica vs Log R) Visual del Cometa C/2014 E2 (Jacques) al 9 de Mayo de 2015. / H0: 6.8, n: 4.2 / LIADA Sección Cometas.

C/2013 X1 (PANSTARRS) C2013X1_Mag Light Curve

Curva de Luz Visual Pre y Post-perihélica del C/2013 US10 (Catalina) Magnitud Heliocéntrica (Helio Mag) versus Distancia al Sol (r) sobre observaciones aportadas a la Sección Cometaria de la LIADA. Fórmula Preperihélica: m = 3.5 + 5 log d + 13.5 log r / Fórmula Postperihélica m = 4.1 + 5 log d + 16.0 log r

Curva de Luz Visual Pre y Post-perihélica del C/2013 X1 (PANSTARRS) Magnitud Heliocéntrica (Helio Mag) versus Distancia al Sol (r) sobre observaciones aportadas a la Sección Cometaria de la LIADA. Fórmula Preperihélica: m = 3.5 + 5 log d + 13.5 log r / Fórmula Postperihélica m = 4.1 + 5 log d + 16.0 log r

C/2013 US10 (Catalina) C2013US10_Mag Light Curve

Curva de Luz Visual Pre y Post perihélica del C/2013 US10 (Catalina) Magnitud Heliocéntrica (Helio Mag) versus Distancia al Sol (r) sobre observaciones aportadas a la Sección Cometaria de la LIADA

Curva de Luz Visual Pre y Post perihélica del C/2013 US10 (Catalina) Magnitud Heliocéntrica (Helio Mag) versus Distancia al Sol (r) sobre observaciones aportadas a la Sección Cometaria de la LIADA / 20160902. Fórmula Preperihélica: m = 4.9 + 5 log D + 8.2 log R / Fórmula Postperihélica: m= 5.5 + 5 log D + 8.4 log R

C/2012 K1 (PANSTARRS) C2012K1_Mag  Light Curve

Curva de Luz (Mag. heliocéntrica vs Log R) Visual del Cometa C/2012 K1 (PANSTARRS) al 6 de Diciembre. LIADA Sección Cometas. Preperihelio: Ho 4.7, n: 4. Postperihelio Ho 5.5, n: 4

C/2012 K1 (PANSTARRS) Curva de Luz (Mag. heliocéntrica vs Log R) Visual del Cometa C/2012 K1 (PANSTARRS) al 9 de Mayo. LIADA Sección Cometas. Pre-perihelio: Ho 4.7, n: 4. Post-perihelio Ho 5.5, n: 4


252P/LINEAR Light Curve

LC_252P_LIADA_20160607g

Curva de Luz Visual Pre y Post perihélica del 252P Magnitud Heliocéntrica (Helio Mag) versus Distancia al Sol (r) sobre observaciones aportadas a la Sección Cometaria de la LIADA. / Fórmula Preperihélica: m = 13.5 + 5 log d + 800.0 log r / Fórmula Postperihélica 1 m = 11.7 + 5 log d + 180.0 log r /Fórmula Postperihélica 2 m = 12.7 + 5 log d + -100.0 log r / Fórmula Postperihélica 3 m = 9.5 + 5 log d + 14.0 log r

260P/McNaught
2019 Sep. 11.08 UT: m1=12.1, Dia.=1.1, DC=5; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 10.02 UT: m1=12.0, Dia.=1.5′, DC=5, Tail= 3 arcmin. in PA: 240 deg.; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.65]
2019 Sep. 09.71 UT: m1=11.6, Dia.=1.7′, DC=6, Tail= 3.2′ in PA: 225 deg.; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2019 Sep. 07.25 UT: m1=12.2, Dia.=1.2′, DC=4; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2019 Sep. 06.09 UT: m1=12.3, Dia.=1.3′, DC=5; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 05.73 UT: m1=12.7, Dia.=1’, DC=6; 40-cm L(59x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 4.5’ in length in P.A. 243° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 04.94 UT: m1=11.9, Dia.=1.4′, DC=5; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.79]
2019 Sep. 04.07 UT: m1=11.6, Dia.=1.5′, DC=4; 20-cm SCT (133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Sep. 03.70 UT: m1=12.7, Dia.=1.2’, DC=6; 40-cm L(59x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 2.4’ in length in P.A. 245° approximately. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Sep. 03.08 UT: m1=12.3, Dia.=1′, DC=5/; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Sep. 02.94 UT: m1=13.0 CCD, Dia.=0.56′, DC=6/, Tail=5.3′ in PA=241 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Sep. 01.93 UT: m1=12.1, Dia.=1′, DC=5; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.68]
2019 Aug. 31.01 UT: m1=12.4, Dia.=1′, DC=5; 25.4-cm L(104x); Maik Meyer (Linter, Germany)
2019 Aug. 28.71 UT: m1=12.6, Dia.=1.1’, DC=6; 40-cm L f:4.5(59x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 4’ in length in P.A. 246° approximately. Stellar pseudo-nucleus, opaque inner coma, faint outer coma. Coma dims in Swan Band filter, centre still visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 28.11 UT: m1=11.5, Dia.=1.5′, DC=4; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Aug. 27.97 UT: m1=12.0, Dia.=0.8′, DC=4/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.69]
2019 Aug. 26.93 UT: m1=13.7 CCD, Dia.=0.45′, DC=7/, Tail=1.37′ in PA=251 deg.; 0.41-m Newtonian reflector f/3.9 + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Aug. 26.92 UT: m1=11.7, Dia.=1.1′, DC=5; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.68]
2019 Aug. 08.71 UT: m1=13.6, Dia.=0.6’, DC=6; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 1.8’ in length in P.A. 250° approximately. Stellar pseudo-nucleus, opaque inner coma, faint outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 05.11 UT: m1=11.8, Dia.=1.3′, DC=4; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.4]
2019 Aug. 03.70 UT: m1=14.0, Dia.=0.7’, DC=6; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 1.3’ in length in P.A. 230°. Diffuse outer coma, does not enhance in Swan Band filter (dims considerably). Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 02.07 UT: m1=11.7, Dia.=1.3′, DC=4/; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.2]
2019 July 30.04 UT: m1=11.6, Dia.=1.3′, DC=4; 20-cm SCT(100x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Sidgwick method. APASS comparison stars. SQM: 21.4]

240P/NEAT
2019 Apr. 02.03 UT: m1=14.1 CCD, Dia.=0.60′, DC=7/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Apr. 01.95 UT: m1=16.8 CCD, Dia.=0.33′, DC=8; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2017 Nov. 08.46 UT: m1=14.2, Dia.=1.2’, DC=2; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Cloud eventually ended observation. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 27.62 UT: m1=14.1, Dia.=0.7’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight brightening to centre, appears more condensed in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 21.72 UT: m1=14.2, Dia.=0.7’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in periods of good seeing. Diffuse coma. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 19.45 UT: m1=14.0, Dia.=1.1’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 15.46 UT: m1=14.0, Dia,=1’; DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 01.74 UT: m1=14.0, Dia.=0.8’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]

231P/LINEAR-NEAT
2019 Mar. 11.85 UT: m1=17.5 CCD, Dia.=0.22′, DC=7/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)

159P/LONEOS
2019 Apr. 04.88 TU: m1=17.7 CCD, Dia.=0.27′, DC=8/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)

123P/West-Hartley 
2019 May  06.43 UT: m1=13.4, Dia.=1.4’, DC=2; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 May 05.84 UT: m1=13.7 CCD, Dia.=1′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Observatory B74, Santa Maria de Montmagastrell, España)
2019 May 04.02 UT: m1=12.3, Dia.=2′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. 42º 55′ N, 5º 48′ W, alt. 1720 m) [Elongated coma. Sidgwick method. APASS comparison stars. SQM: 21.5]
2019 May 03.54 UT: m1=13.4, Dia.=1.4′, DC=3; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2019 May 02.50 UT: m1=13.7, Dia.=1.1′, DC=3; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2019 Apr. 28.41 UT: m1=13.9, Dia.=1’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Apr. 26.93 UT: m1=14.2 CCD, Dia.=0.54′, DC=7; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Apr. 24.87 UT: m1=13.5, Dia.=1.5, DC=3/; 30-cm T f/10(179x); Martin Lehky (Czech Republic)
2019 Apr. 07.38 UT: m1=12.8, Dia.=2’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 19.9°; Difficult, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Apr. 02.89 UT: m1=11.5, Dia.=2′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Celleron – Benllera, Leon, Spain. 42º 45′ N, 5º 44′ W, alt. 1190 m) [Sidgwick method. APASS comparison stars. SQM: 21.3]
2019 Apr. 01.90 UT: m1=12.2, Dia.=1.7′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.92]
2019 Mar. 23.90 UT: m1=11.5, Dia.=2.5′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.5]
2019 Mar. 09.94 UT: m1=11.8, Dia.=2.2′, DC=4; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Trichero, Leon, Spain. 42º 46′ N, 5º 53′ W, alt. 1190 m) [Sidgwick method. APASS comparison stars. SQM: 21.6]
2019 Mar. 05.17 UT: m1=12.3, Dia.=1.5′, DC=3; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [near a star with m1: 10.2]
2019 Feb. 24.95 UT: m1=12.4, Dia.=1.2′, DC=4; 20-cm SCT(77x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [Sidgwick method. APASS comparison stars. SQM: 21.5]
2019 Feb. 11.67 UT: m1=13.3, Dia.=1’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult due to glare from nearby star. Faintly stellar at centre, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 10.94 UT: m1=14.2 CCD, Dia.=0.29′, DC=8, Tail=1.5′ in PA: 270 deg.; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Feb. 09.70 UT: m1=13.5, Dia.=1.3’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Faint stellar central condensation, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 04.70 UT: m1=13.1, Dia.=1.4’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Faintly stellar in good seeing, diffuse. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 03.99 UT: m1=12.9, Dia.=1.5′, DC=4; 27-cm SCT(92x); Valentín Díaz (Cancárix, Albacete, España)
2019 Feb. 03.68 UT: m1=12.9, Dia.=1.7’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse. Faint stellar central condensation, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Jan. 14.66 UT: m1=13.4, Dia.=1.1’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, small opaque centre. Appears stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Jan. 14.06 UT: m1=12.7, Dia.=1.1′, DC=5; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent minor outburst. Faint and diffuse outer coma diameter: 3.5′, providing m=11.2 (Tycho-2). Condensed inner coma diameter: 1.1′, providing m=12.7. Near-stellar central condensation, m2=14.2:. Nearby field stars checked in DSS. Limiting stellar magnitude fainter than 14.5. Mountain location, very clear sky. APASS comparison stars. Sidgwick method. SQM: 21.5]
2019 Jan. 12.61 UT: m1=13.8, Dia.=0.9’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Close to stars. Outer coma diffuse and semi-opaque, centre sometimes stellar in good seeing. Low altitude= 14.4°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

78P/Gehrels 2 
2019 Jan. 06.81 UT: m1=11.7, Dia.=3′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 20.9; 21.2 at zenith]
2018 Nov. 30.38 UT: m1=[13.8; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 07.44 UT: m1=14.1, Dia.=0.6′, DC=2; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.82 UT: m1=15.6 CCD, Dia.=0.26′, DC=4; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Sep. 17.66 UT: m1=[13.8, neegative; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 14.95 UT: m1=16.0 CCD, Dia.=0.39′, DC=8; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Belarus)

68P/Klemola
2019 Sep. 16.36 UT: m1=13.3, Dia.=1.4’, DC=3; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Sep. 03.95 UT: m1=10.8, Dia.=3′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Brighter inner coma diameter 3′, providing m=10.8. Faint and diffuse outer coma diameter 8′, providing m=9.7. Altitude: 19°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2019 Aug. 28.43 UT: m1=13.3, Dia.=1.3’, DC=4/; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Moderately condensed opaque centre fading rapidly to semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 27.94 UT: m1=11.1, Dia.=2.5′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Brighter inner coma diameter 2′.5, providing m=11.1. Faint and diffuse outer coma diameter 10′, providing m=9.8. Altitude: 25°. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2019 Aug. 22.92 UT: m1=11.3, Dia.=2′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Brighter inner coma diameter 2′, providing m=11.3. In 20-cm SCT(77x): Faint and diffuse outer coma diameter 8′, providing m=10.0:. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2019 Aug. 04.96 UT: m1=11.7, Dia.=2′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Brighter inner coma diameter 2′, providing m=11.7. Faint and diffuse outer coma diameter 5′. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Aug. 03.38 UT: m1=13.8, Dia.=1.8’, DC=5; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 July 30.01 UT: m1=11.8, Dia.=2′, DC=4; 20-cm SCT(100x); Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Brighter inner coma diameter 2′, providing m=11.8. Faint and diffuse outer coma diameter 4′, providing m=10.5. This outer coma was also observed on July 24.99 UT. Nearby field stars checked in DSS. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 July 23.43 UT: m1=14.6, Dia.=1.1’, DC=6; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, gradually brightening to stellar centre. Close to star but easily resolvable. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 June 30.89 UT: m1=14.7 CCD, Dia.=1.0’; 40-cm SCT f:10 + CCD; Josep M. Bosch (Remote Observatory B74, Santa Maria de Montmagastrell, Spain)
2019 May  30.96 UT: m1=15.6 CCD, Dia.=0.7’; 40-cm SCT f:10 + CCD; Josep M. Bosch (Remote Observatory B74, Santa Maria de Montmagastrell, Spain)

64P/Swift-Gehrels 
2019 Feb. 26.81 UT: m1=11.6, Dia.=3’, DC=1; 20-cm L f:4(106x); Martin Lehky (Czech Republic)
2019 Feb. 24.97 UT: m1=10.7, Dia.=4′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Feb. 23.48 UT: m1=12.4, Dia.=2.3′, DC=1; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Ibaraki, Japan)
2019 Feb. 04.47 UT: m1=11.2, Dia.=3.1’, DC=2; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, weak centre. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Feb. 03.95 UT: m1=11.1, Dia.=4.5′, DC=3; 27-cm SCT(92x); Valentín Díaz (Cancárix, Albacete, España)
2019 Feb. 03.44 UT: m1=11.6, Dia.=2.8’, DC=2; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse, transparent coma, weakly condensed. Faintly visible at x39. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Jan. 25.86 UT: m1=9.8, Dia.=5′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Villacintor, Leon, Spain. Alt. 930 m, 42º 29′ N, 5º 11′ W) [Mag. 12.1 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Jan. 24.72 UT: m1=10.7, Dia.=4′, DC=2/; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.19]
2019 Jan. 25.85 UT: m1=10.8, Dia.=3′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Jan. 14.02 UT: m1=9.8, Dia.=6′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Several stars inside the coma, the brightest being mag. 10.8. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Jan. 12.98 UT: m1=9.9, Dia.=5′, DC=2; 25-cm L(66x); Valentín Díaz (La Romaneta, Alicante, España)
2019 Jan. 12.56 UT: m1=9.9, Dia.=6’, DC=3; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse, weakly condensed. Low altitude = 10.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S. Cat= TK]
2019 Jan. 11.91 UT: m1=10.1, Dia.=3′, DC=2; 20-cm T(50x); Carlos Labordena (Castellón, España)
2019 Jan. 06.82 UT: m1=9.0, Dia.=8′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Jan. 04.89 UT: m1=9.3, Dia.=7′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Les Retuertes – Sierra del Aramo, Asturias, Spain. alt. 1350 m, 43º 10′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2; 21.3 at zenith]
2019 Jan. 04.123 UT: m1=9.4 Dia.=4′, DC=5; 20-cm SCT f/10(50x); Roger Jimenez (COAT, Lara, Venezuela) [MALE: 5.9. Sidgwick method. Tycho-2 comparison stars. Altura: 79°]
2019 Jan. 01.87 UT: m1=9.1, Dia.=7′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Dec. 31.60 UT: m1=10.2, Dia.=6′, DC=3; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 31.04 UT: m1=9.5, Dia.=5′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 30.88 UT: m1=9.0, Dia.=9′, DC=4; 27-cm SCT(58x); Valentín Díaz (Cancárix, Albacete, España)
2018 Dec. 29.89 UT: m1=9.5, Dia.=5′, DC=2; 15-cm T(44x); Carlos Labordena (Castellón, España)
2018 Dec. 28.46 UT: m1=9.2, Dia.=12’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia] [Circular coma, opaque centre, moderately condensed, fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 27.46 UT: m1=9.2, Dia.=8.7’, DC=5; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia] [Enhances in Swan Band filter, opaque centre, fading to transparent edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 15.00 UT: m1=9.4, Dia.=7′, DC=3; 20-cm T(50x); Carlos Labordena (Castellón, España)
2018 Dec. 14.06 UT: m1=9.0, Dia.=7′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain. Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Dec. 13.83 UT: m1=9.1, Dia.=3.5′, DC=3/; 13-cm L F:5(25x); Danil Sidorko (Korenovsk, Russia)
2018 Dec. 12.04 UT: m1=8.9, Dia.=9′, DC=3/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 11.04 UT: m1=9.2, Dia.=6′, DC=3/; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [image enhancement with comet filter]
2018 Dec. 11.05 UT: m1=9.0, Dia.=8′, DC=3; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 09.89 UT: m1=9.9, Dia.=3.3′, DC=4; 27-cm SCT(93x); Valentín Díaz (La Romaneta, Alicante, España)
2018 Dec. 09.80 UT: m1=9.2, Dia.=3′, DC=3/; 13-cm L F:5(25x); Danil Sidorko (Korenovsk, Russia)
2018 Dec. 08.71 UT: m1=9.3, Dia.=3.3′, DC=3; 25-cm L F:5(46x, 150x); Danil Sidorko (Korenovsk, Russia)
2018 Dec. 08.48 UT: m1=8.5, Dia.=11’, DC=3/; 11×70 B; Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre, weakly condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 07.45 UT: m1=9.0, Dia.=10.4’; DC=5; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 06.84 UT: m1=8.9, Dia.=8′, DC=3/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 05.82 UT: m1=9.3, Dia.=8′, DC=3; 15-cm T(30x); Carlos Labordena (Castellón, España)
2018 Dec. 03.97 UT: m1=9.5, Dia.=6′, DC=3; 10-cm R(26x); Valentín Díaz (La Romana, Alicante, España)
2018 Dec. 02.99 UT: m1=9.4, Dia.=5′, DC=3; 20×80 B; Roger Jimenez (Barquisimeto, Venezuela) [light pollution]
2018 Dec. 01.39 UT: m1=9.1, Dia.=6′, DC=3/; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2018 Dec. 01.45 UT: m1=9.0, Dia.=8.5’, DC=3; 11×70 B; Chris Wyatt (Walcha, NSW, Australia) [Close to stars, Enhances in Swan Band filter, very diffuse. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Nov. 30.75 UT: m1=11.2 CCD, Dia.=1.26′, DC=6; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2018 Nov. 30.45 UT: m1=9.2, Dia.=6.6’, DC=3; 11×70 B; Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to mag 8.9 star. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK
2018 Nov. 30.41 UT: m1=9.1, Dia.=8′, DC=4; 40.0-cm L f/4.5 (36x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.04 UT: m1=8.9, Dia.=5′, DC=3/; 20×80 B; Roger Jimenez (Barquisimeto, Venezuela)
2018 Nov. 29.82 UT: m1=9.4, Dia.=4.5′, DC=3/; 25.4-cm L (48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.47]
2018 Nov. 29.47 UT: m1=9.1, Dia.=8.4’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Large transparent outer coma, gradually brightens to opaque centre, small faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 28.83 UT: m1=9.9, Dia.=5’, DC=2; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 27.82 UT: m1=9.7, Dia.=4′, DC=3; 15-cm T(44x); Carlos Labordena (Castellón, España)
2018 Nov. 26.43 UT: m1=9.1, Dia.=8.5’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band filter. Small opaque centre, faintly stellar. Large diffuse and transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 20.94 UT: m1=10.1, Dia.=2.5′, DC=3; 20-cm T(50x); Carlos Labordena (Castellón, España)
2018 Nov. 17.99 UT: m1=9.1, Dia.=4.5′, DC=3/; 25.4-cm L(64x); Maik Meyer (Limburg, Germany)
2018 Nov. 17.79 UT: m1=9.3, Dia.=5’, DC=2/; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 16.99 UT: m1=9.0, Dia.=6.5′, DC=4; 25.4-cm L(64x); Maik Meyer (Limburg, Germany) [comet involved w/ an 8th mag star. MEY]
2018 Nov. 16.92 UT: m1=9.1, Dia.=5.5’, DC=2/; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 16.75 UT: m1=9.5, Dia.=3′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [Method S, Lm=6.32]
2018 Nov. 16.12 UT: m1=9.1, Dia.=7′, DC=3/; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9.].
2018 Nov. 14.76 UT: m1=9.3, Dia.=5’, DC=2/; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 14.01 UT: m1=9.6, Dia.=3.5′, DC=5; 60-cm L(81x); Sandor Szabo (Sopron, Hungary)
2018 Nov. 13.81 UT: m1=9.2, Dia.=5′, DC=3/; 25.4-cm L(64x); Maik Meyer (Limburg, Germany)
2018 Nov. 13.14 UT: m1=9.2, Dia.=7′, DC=3/; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1280 m, 43º 10′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Nov. 12.76 UT: m1=9.3, Dia.=6′, DC=4; 13-cm L(65x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.56]
2018 Nov. 11.44 UT: m1=9.5, Dia.=5’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, star in coma. Moonlight. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 11.04 UT: m1=9.7, Dia.=5′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 10.96 UT: m1=9.0, Dia.=3.2′, DC=3; 25-cm L(73x); Valentín Díaz (La Romana, Alicante, España)
2018 Nov. 09.15 UT: m1=9.2, Dia.=7′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Several stars inside the coma, the brightest being mag. 8.6 (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Nov. 08.48 UT: m1=9.2, Dia.=8’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Faint tenuous outer coma, opaque inner coma with small moderately condensed centre. Faint stars in coma. Outer coma appears slightly elongated to the West approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 06.77 UT: m1=9.2, Dia.=6’, DC=3/; 20×100 B; Martin Lehky (Czech Republic)
2018 Nov. 06.04 UT: m1=9.7, Dia.=5′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 05.94 UT: m1=7.8, Dia.=10′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 Nov. 05.84 UT: m1=8.8, Dia.=6′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 Nov. 05.83 UT: m1=8.9, Dia.=5′, DC=3; 15-cm T(30x); Carlos Labordena (Castellón, España)
2018 Nov. 04.77 UT: m1=9.7, Dia.=3′, DC=5; 25.4-cm L (48x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.70]
2018 Nov. 03.83 UT: m1=8.7, Dia.=7′, DC=3/; 25×100 B; Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47′ N, 6º 00′ W) [In 20 cm SCT (77x) : m1=9.3, Dia.=6′, DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Nov. 03.78 UT: m1=9.9, Dia.=3.5′, DC=3/; 25.4-cm L f/5(64x); Maik Meyer (Limburg, Germany)
2018 Nov. 03.64 UT: m1=9.9, Dia.=5′, DC=5; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 03.43 UT: m1=9.9, Dia.=6.2’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 19.0°. Some interference from bright star in coma. Moderately condensed centre, opaque fading to semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 30.44 UT: m1=9.9, Dia.=8.0’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma, opaque inner coma. Low altitude = 19.3°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 30.06 UT: m1=10.0, Dia.=4′, DC=2; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 29.87 UT: m1=10.3, Dia.=3′, DC=3; 20-cm SCT(50x); Carlos Labordena (Castellón, España)
2018 Oct. 29.45 UT: m1=9.6, Dia.=5′; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia)
2018 Oct. 29.44 UT: m1=10.0, Dia.=6.2’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter. Low altitude= 19.2°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 27.42 UT: m1=10.0, Dia.=5’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma centre opaque, moderately condensed, outer coma semi-transparent. Coma centre dims in Swan Band filter. Low altitude = 17.1°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 22.09 UT: m1= 10.3, Dia.=3′, DC=2; 22-cm L (160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil);[ moonlight ]
2018 Oct. 21.05 UT: m1=10.3, Dia.=3′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.66]
2018 Oct. 20.15 UT: m1=9.5, Dia.=6′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2018 Oct. 16.84 UT: m1=10.8, Dia.=2.4′, DC=4/; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.69]
2018 Oct. 16.11 UT: m1=8.9, Dia.=7′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2018 Oct. 15.79 UT: m1=11.0, Dia.=2.6′, DC=4/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.23]
2018 Oct. 15.76 UT: m1=10.4, Dia.=2.8′, DC=3; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 15.74 UT: m1=12.6 CCD, Dia.=0.68′, DC=7/; 0.20-m f/4 Schmidt-Newton + CCD; S. Shurpakov (Observatory A98, Belarus)
2018 Oct. 14.76 UT m1=10.5, Dia.=2.3′, DC=2/; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 13.76 UT: m1=10.6, Dia.=2.3′, DC=3; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 13.73 UT: m1=10.4, Dia.=3.2′, DC=3; 25-cm L F:5(70.5x, 150x); Danil Sidorko (Korenovsk, Russia)
2018 Oct. 11.74 UT: m1=10.8, Dia.=1.8′, DC=4; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.63]
2018 Oct. 11.73 UT: m1=10.8, Dia.=2.0′, DC=3/; 25-cm L F:5(70.5x, 150x); Danil Sidorko (Korenovsk, Russia)
2018 Oct. 10.77 UT: m1=10.5, Dia.=2.3′, DC=3; 25.4-cm L f/5 (64x); Maik Meyer (Limburg, Germany)
2018 Oct. 08.44 UT: m1=11.2, Dia.=4.5’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Slight interference from glare of nearby bright star. Opaque centre, moderately condensed, sometimes appears faintly stellar in periods of good seeing. Low altitude = 16.0°. Poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 07.76 UT: m1=11.6, Dia.=2.5′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.63]
2018 Oct. 07.46 UT: m1=11.6, Dia.=2.3′, DC=4/; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.80 UT: m1=13.4 CCD, Dia.=0.37′, DC=7; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Oct. 06.54 UT: m1=11.0, Dia.=2.2′, DC=4; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 05.78 UT: m1=10.5, Dia.=2.2′, DC=2/; 25.4-cm L f/5 (64x); Maik Meyer (Limburg, Germany)
2018 Oct. 04.85 UT: m1=11.7, Dia.=1.2′, DC=3/; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia) [method S]
2018 Oct. 04.80 UT: m1=11.3, Dia.=1.3′, DC=2/; 25.4-cm L f/5 (104x); Maik Meyer (Limburg, Germany)
2018 Oct. 03.85 UT: m1=10.2, Dia.=6′, DC=3; 20-cm SCT(77x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W)[Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Sep. 30.93 UT: m1=12.3, Dia.=1′, DC=3, no tail; 23.5-cm SCT(138x); Carlos Labordena (Castellón, España)
2018 Sep. 30.79 UT: m1=11.6, Dia.=1.3′, DC=2/; 25.4-cm L f/5(104x); Maik Meyer (Limburg, Germany)
2018 Sep. 29.81 UT: m1=11.9:, Dia.=1.0′, DC=2/; 25.4-cm L 5 104x); Maik Meyer (Limburg, Germany)
2018 Sep. 29.76 UT: m1=11.8, Dia.=2′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.47]
2018 Sep. 29.74 UT: m1=14.1 CCD, Dia.=0.26′, DC=7; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Sep. 22.01 UT: m1=12.2, Dia.=1.5′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.11]
2018 Sep. 19.16 UT: m1=12.2, Dia.=1.5′, DC=4; 20-cm SCT(100x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Brighter inner coma diameter: 1.5′, providing m=12.2 (AQ). Very faint and diffuse outer coma diameter: 5′, providing m=10.8:(TK). Sidgwick method. APASS comparison stars. SQM: 21.5]
2018 Sep. 18.71 UT: m1=13.1, Dia.=1.3’, DC=4; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 19.6°; Diffuse coma with moderately condensed centre. Sky slightly hazy due to dust. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 17.67 UT: m1=12.2, Dia.=1.6′, DC=5; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 16.68 UT: m1=13.2, Dia.=0.8′, DC=6; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 15.04 UT: m1=14.9 CCD, Dia.=0.50′, DC=7/; 0.25-m f/4.7 Newton + CCD; Serguey Shurpakov (Observatory C36, Belarus)
2018 Sep. 10.00 UT: m1=12.5, Dia.=1.1′, DC=4; 20-cm SCT(100x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Brighter inner coma diameter : 1.1′, providing m=12.5 (AQ). Very faint and diffuse outer coma diameter : 3′, providing m=11.2:(AQ). Sidgwick method. APASS comparison stars. SQM: 21.5]
2018 Sep. 09.73 UT: m1=13.6, Dia.=1’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult; Very diffuse. Transparent coma, slightly brighter centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Sep. 01.89 UT: m1=11.0:, Dia.=6′, DC=1; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent outburst. Inner coma magnitude was difficult to estimate due to close mag. 13.9 (APASS) star. Faint and diffuse outer coma diameter: 6′, providing m=11.0: (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2018 Sep. 01.83 UT: m1=15.7 CCD, Dia.=0.22′, DC=8; 0.25-m f/4.7 Newton + CCD; Serguey Shurpakov (Observatory C36, Belarus)
2018 Aug. 31.84 UT: m1=15.7 CCD, Dia.=0.28′, DC=7; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 20.06 UT: m1=13.1, Dia.=1.1′, DC=4; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent outburst. Brighter inner coma diameter: 1.1′, providing m=13.1 (APASS). Very faint and diffuse outer coma diameter: 7′, providing m=10.7: (Tycho). Sidgwick method. SQM: 21.5]
2018 Aug. 18.25 UT: m1=13.1:, Dia.=1.25′, DC=3; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [averted vision]
2018 Aug. 17.91 UT: m1=16.8 CCD, Dia.=0.33′, DC=7/; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Baran’, Belarus)
2018 Aug. 16.96 UT: m1=16.4 CCD, Dia.=0.17′, DC=7/; 0.25-m f/4.7 Newton + CCD; Serguey Shurpakov (Observatory С36, Baran’, Belarus)
2018 Aug. 15.93 UT: m1=14.3, Dia.=0.7′, DC=2; 60-cm L(305x); Sandor Szabo (Sopron, Hungary)
2018 Aug. 15.73 UT: m1=13.0, Dia.=1’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, opaque across coma, slightly brighter at centre. Post-outburst. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 15.23 UT: m1=14.0, Dia.=0.7’, DC=3; 41-cm L(229x); Alan Hale (Cloudcroft, New Mexic, USA)
2018 Aug. 14.95 UT: m1=13.2, Dia.=0.6′, DC=7; 20-cm SCT(200x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In outburst. Inner coma diameter: 0.6′, surrounded by very faint outer coma. Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 Aug. 06.01 UT: m1=17.1 CCD, Dia.=0.26′, DC=8; 0.25-m f/4.7 Newton + CCD; Serguey Shurpakov (Observatory С36, Baran’, Belarus)

60P/Tsuchinshan 2 
2019 Apr. 28.87 UT: m1=15.0 CCD, Dia.=1′; 0.40-m f/10 SCT + CCD; Josep M. Bosch (Observatory B74, Santa Maria de Montmagastrell, España)
2019 Apr. 07.39 UT: m1=14.3, Dia.=1.0’, DC=2; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Mar. 04.44 UT: m1=13.5, Dia.=1.0’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult due to slight background haze from humidity and poor seeing. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Feb. 11.66 UT: m1=13.6, Dia.=0.9’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Faint tail traced to 2.4’ in length in P.A. 303°. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 09.68 UT: m1=13.9, Dia.=1.0’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, inner coma opaque with faint stellar pseudo nucleus visible in good seeing. Faint tail can be traced to 2.3’ in length in P.A. 310°. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Feb. 04.69 UT: m1=13.5, Dia.=1.2’, DC=4/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Sometimes stellar, opaque inner coma fading to edges. Comparison stars checked using APASS data in Guide 9.0. Method= M, Cat= AQ]
2019 Jan. 12.59 UT: m1=13.8, Dia.=0.7’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Small coma, centre appears stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Jan. 07.66 UT: m1=14.0, Dia.=0.9’, DC=5; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult due to proximity to stars, slight hazy sky due to low cloud passing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Jan. 06.84 UT: m1=13.6, Dia.=0.6′, DC=5; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 30.71 UT: m1=13.2, Dia.=2.5’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Difficult, diffuse coma, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Dec. 14.25 UT: m1=12.8, Dia.=0.7′, DC=6; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain. Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. APASS comparison stars. SQM: 21.2]
2018 Nov. 14.11 UT: m1=15.5, Dia.=0.2′, DC=4; 60-cm L(406x); Sandor Szabo (Sopron, Hungary)
2018 Nov. 03.76 UT: m1=[13.7, negative; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 22.10 UT: m1=17.7 CCD, Dia.=0.18′, DC=8/; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)

49P/Arend-Rigaux
2019 Mar. 02.07 UT: m1=18.1 CCD, Dia.=0.19′, DC=8/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)

46P/Wirtanen 
2019 Apr. 02.91 UT: m1=11.2, Dia.=4′, DC=2; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Celleron – Benllera, Leon, Spain. 42º 45′ N, 5º 44′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Apr. 01.98 UT: m1=16.3 CCD, Dia.=0.57′, DC=4/; 0.20-m f/4 Schmidt – Newton + CCD; Sergey Shurpakov (Observatory A98, Belarus)
2019 Mar. 24.79 UT: m1=16.2 CCD, Dia.=0.33′, DC=6/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Mar. 24.76 UT: m1=12.5, Dia.=2′, DC=1/; 25.4-cm L(190.5x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.53]
2019 Mar. 23.87 UT: m1=10.8, Dia.=4′, DC=2; 20-cm SCT (100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. 42º 55′ N, 5º 48′ W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Mar. 23.84 UT: m1=16.7 CCD, Dia.=0.30′, DC=7; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Mar. 10.74 UT: m1=11, Dia.=3′, DC=2/; 25-cm L(70x,150x); Danil Sidorko (Korenovsk, Russia)
2019 Mar. 09.90 UT: m1=10.6, Dia.=4′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Trichero, Leon, Spain. 42º 46′ N, 5º 53′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Mar. 09.88 UT: m1=10.5, Dia.=4′, DC=2; 15-cm T(44x); Carlos Labordena (Castellón, España) [no tail]
2019 Mar. 06.81 UT: m1=14.6 CCD, Dia.=0.48′, DC=6/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Mar. 02.89 UT: m1=10.3, Dia.=5′, DC=2; 15-cm T(44x); Carlos Labordena (Castellón, España) [no tail]
2019 Mar. 02.73 UT: m1=11.1, Dia.=3′, DC=1/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.60]
2019 Feb. 27.79 UT: m1=10.3, Dia.=4 2′, DC=2; 25.4-cm L f:5(64x); Maik Meyer (Linter, Germany)
2019 Feb. 26.82 UT: m1=10.5, Dia.=3.5’, DC=2; 20-cm L f:4(26x); Martin Lehky (Czech Republic)
2019 Feb. 26.80 UT: m1=10.3:, Dia.=4′, DC=2; 25.4-cm L f:5(64x); Maik Meyer (Linter, Germany)
2019 Feb. 25.78 UT: m1=10.1, Dia.=3.5′, DC=2/; 25.4-cm L f:5(64x); Maik Meyer (Linter, Germany) [11.4-mag star in coma]
2019 Feb. 25.78 UT: m1=10.5, Dia.=3.5’, DC=2; 20-cm L f:4(26x); Martin Lehky (Czech Republic)
2019 Feb. 24.85 UT: m1=8.8, Dia.=8′, DC=2; 25×100 B; Juan Jose Gonzalez (In 20 cm SCT (77x) : m1=10.3, Dia.=5′, DC=2/. Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2019 Feb. 24.85 UT: m1=10.3, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez Puerto de Aralla, Leon, Spain)
2019 Feb. 24.78 UT: m1=9.9, Dia.=3.7′, DC=2; 25.0-cm L(64x); Maik Meyer (Linter, Germany)
2019 Feb. 23.86 UT: m1=9.7, Dia.=6′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Feb. 23.79 UT: m1=9.4, Dia.=7′, DC=2/; 25.0-cm L(64x); Maik Meyer (Linter, Germany)
2019 Feb. 23.78 UT: m1=9.2, Dia.=8′, DC=2; 12.0-cm R(30x); Maik Meyer (Linter, Germany)
2019 Feb. 23.49 UT: m1=10.2, Dia.=4.3′, DC=1; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Ibaraki, Japan)
2019 Feb. 22.83 UT: m1=8.9, Dia.=10′, DC=2; 12.0-cm R(30x); Maik Meyer (Linter, Germany)
2019 Feb. 22.77 UT: m1=12.6 CCD, Dia.=0.55′, DC=6/; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Feb. 16.19 UT: m1=8.8, Dia.=10′, DC=2/; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 15.15 TU m1=8.8, Dia.=9′, DC=2; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 13.17 UT: m1=7.7, Dia.=18′, DC=2; 12×45 monocular; Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5. 21.6 at zenit]
2019 Feb. 12.79 UT: m1=8.4, Dia.=8’, DC=2/; 25×100 B; Martin Lehky (Czech Republic)
2019 Feb. 11.97 UT: m1=8.7, Dia.=11′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 10.68 UT: m1=9.5, Dia.=3′, DC=1/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=5.29]
2019 Feb. 08.94 UT: m1=8.2, Dia.=15′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 08.93 UT: m1=8.3, Dia.=12′, DC=2; 15-cm T(30x); Carlos Labordena (Castellón, España)
2019 Feb. 07.84 UT: m1=8.5, Dia.=10′, DC=2/; 12-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 07.17 UT: m1=8.1, Dia.=10’, DC=3; 12×60 B; Martin Lehky (Czech Republic)
2019 Feb. 06.15 UT: m1=8.5, Dia.=8′, DC=2/; 12-cm R f:5(30xx); Maik Meyer (Linter, Germany)
2019 Feb. 06.01 UT: m1=6.7, Dia.=25′, DC=2; 12×45 monocular; Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain. 43º 9′ N, 5º 54′ W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3; 21.5 at zenit]
2019 Feb. 05.90 UT: m1=7.3, Dia.=25′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Feb. 05.89 UT: m1=7.8, Dia.=20′, DC=2; 20-cm T(50x); Carlos Labordena (Castellón, España)
2019 Feb. 04.16 UT: m1=8.1, Dia.=11’, DC=3; 12.0-cm R f:5(30x); Maik Meyer (Linter, Germany)
2019 Feb. 03.92 UT: m1=8.8, Dia.=6′, DC=2; 20X80 B; Valentín Díaz (Cancárix, Albacete, España)
2019 Feb. 03.00 UT: m1=6.5, Dia.=30′, DC=2; 12×45 monocular; Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain. Alt. 870 m, 42º 20′ N, 5º 23′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2019 Jan. 30.21 UT: m1=7.0, Dia.=15’, DC=3; 10×50 B; Martin Lehky (Czech Republic)
2019 Jan. 29.86 UT: m1=7.7, Dia.=23′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Jan. 26.92 UT: m1=7.6, Dia.=20′, DC=2; 10X50 B; Valentín Díaz (La Romaneta, Alicante, España)
2019 Jan. 26.91 UT: m1=7.3, Dia.=22′, DC=2; 12.7-cm L(25X); Valentín Díaz (La Romaneta, Alicante, España)
2019 Jan. 25.89 UT: m1=7.6, Dia.=20′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Jan. 25.84 UT: m1=6.2, Dia.=35′, DC=3; 12×45 monocular; Juan Jose Gonzalez (Villacintor, Leon, Spain. Alt. 930 m, 42º 29′ N, 5º 11′ W) [Mag. 5.3 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Jan. 24.72 UT: m1=7.6, Dia.=8′, DC=3/; 25.4-cm L (48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.19]
2019 Jan. 21.19 UT: m1=6.9, Dia.=25′, DC=2/; 5.0-cm B(10x); Maik Meyer (Linter, Germany) [all obs during total lunar eclipse]
2019 Jan. 18.75 UT: m1=6.9, Dia.=15’, DC=2/; 10×50 B; Martin Lehky (Czech Republic)
2019 Jan. 14.75 UT: m1=6.7, Dia.=20’, DC=2/; 10×50 B; Martin Lehky (Czech Republic)
2019 Jan. 14.10 UT: m1=5.6, Dia.=45′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Several stars inside the coma, the brightest being mag. 7.0. Sidgwick method. Tycho-2 comparison stars. SQM : 21.5.].
2019 Jan. 12.99 UT: m1=6.8, Dia.=26′, DC=3; 10×50 B; Valentín Díaz (La Romaneta, Alicante, España)
2019 Jan. 11.93 UT: m1=6.2, Dia.=25′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Jan. 08.67 UT: m1=6.4, Dia.=18′, DC=3/; 25.4-cm L(48x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.06]
2019 Jan. 07.16 UT: m1=5.4, Dia.=40′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.6]
2019 Jan. 06.85 UT: m1=5.5, Dia.=35′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1; 21.2 at zenith]
2019 Jan. 06.82 UT: m1=5.5, Dia.=26′, DC=2; 10x70R; Seiichi Yoshida (Ibaraki, Japan)
2019 Ene. 04.167 UT: m1=5.2, Dia.=28′, DC=1; 10×70 B; Roger Jimenez (COAT, Lara, Venezuela) [MALE: 6.0. Sidgwick method. Tycho-2 comparison stars. Altura: 40°]
2019 Jan. 03.19 UT: m1=5.5, Dia.=35′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Jan. 01.89 UT: m1=5.4, Dia.=35′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2019 Jan. 01.80 UT: m1=5.0, Dia.=40′, DC=4; Naked Eye; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 12×45 monocular: m1=5.2, Dia.=45′, DC=3/; several stars inside the coma, the brightest being mag. 7.9 (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Jan. 01.76 UT: m1=5.5, Dia.=30’, DC=2/; Naked Eye; Martin Lehky (Czech Republic)
2019 Jan. 01.75 UT: m1=5.9, Dia.=20’, DC=2/; 10×50 B; Martin Lehky (Czech Republic)
2018 Dec. 31.72 UT: m1=5.4, Dia.=35’, DC=3; Naked Eye; Martin Lehky (Czech Republic)
2018 Dec. 31.71 UT: m1=5.7, Dia.=25’, DC=3; 10×50 B; Martin Lehky (Czech Republic)
2018 Dec. 31.61 UT: m1=5.0, Dia.=40′, DC=2; Naked Eye; Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 31.61 UT: m1=5.6, Dia.=40′, DC=3/; 10x70R; Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 30.90 UT: m1=5.6, Dia.=37′, DC=4; 5×25 B; Valentín Díaz (Cancárix, Albacete, España)
2018 Dec. 30.71 UT: m1=5.4, Dia.=30’, DC=2/; Naked Eye; Martin Lehky (Czech Republic)
2018 Dec. 30.70 UT: m1=5.8, Dia.=20’, DC=2/; 10×50 B; Martin Lehky (Czech Republic)
2018 Dec. 29.87 UT: m1=5.4, Dia.=40′, DC=4; 15-cm T(30x); Carlos Labordena (Castellón, España)
2018 Dec. 29.86 UT: m1=5.2, Dia.=40′, DC=3; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 Dec. 29.82 UT: m1=5.1, Dia.=45′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In 12×45 monocular: several stars inside the coma, the brightest being mag. 7.4 (TK). Comet visible to naked eye, magnitude difficult to estimate due to nearby field stars. Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 27.094 UT: m1=4.6, Dia.=22′, DC=3; 20×80 B; Roger Jimenez (Barquisimeto, Lara, Venezuela, 10°4′ N, 69° 21′ W, Alt. 606m) [MALE: 4.0. Sidgwick method. Tycho-2 comparison stars. Altura: 37°. Pollution. Urban Sky]
2018 Dec. 26.063 UT: m1=4.4, Dia.=20′, DC=3; 20×80 B; Roger Jimenez (Barquisimeto, Lara, Venezuela, 10°4′ N, 69° 21′ W, Alt. 606m) [MALE: 3.8. Sidgwick method. Tycho-2 comparison stars. Altura: 32°. Pollution. Urban Sky]
2018 Dec. 23.99 UT: m1=4.2, Dia.=23′, DC=3; 20×80 B; Roger Jimenez (Barquisimeto, Lara, Venezuela. 10°4′ N, 69° 21′ W, Alt. 606m) [MALE: 4.0. Sidgwick method. Tycho-2 comparison stars. Altura: 28°. Pollution. Urban Sky]
2018 Dec. 21.08 UT: m1=4.4:, Dia.=40′, DC=3; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2018 Dec. 20.08 UT: m1=4.2, Dia.= 45′, DC=3/; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2018 Dec. 19.12 UT: m1= 4.1:, Dia.=50′, DC=3/; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2018 Dec. 18.12 UT: m1=3.8:, Dia.=70′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight, averted vision]
2018 Dec. 18.08 UT: m1=3.9:, Dia.=60′, DC=4/; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2018 Dec. 17.41 UT: m1=5.0, Dia.=40′, DC=3; 10x66R (10x); Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 17.271 UT: m1=3.7, Dia.=80′, DC=3; 20×80 B; Roger Jimenez (Barquisimeto, Lara, Venezuela, 10°4′ N, 69° 21′ W, Alt. 606m) [MALE: 3.95. Sidgwick method. Tycho-2 comparison stars. Altura: 39°. Pollution. Urban Sky]
2018 Dec. 16.29 UT: m1=3.8, Dia.=80′, DC=3; Naked Eye; Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 16.29 UT: m1=4.7, Dia.=50′, DC=4; 10x66R (10x); Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 16.19 UT: m1=3.6, Dia.=>90′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 16.18 UT: m1=3.9, Dia.=70′, DC=5; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 16.09 UT: m1=3.8, Dia.=50′, DC=4; 10×70 B; Jorge Luis Salas (San Diego, Carabobo, Venezuela)
2018 Dec. 16.06 UT: m1=4.1, Dia.=60′, DC=4; 10×42 B; Willian Souza (Sao Paulo, Brazil)
2018 Dec. 15.44 UT: m1=3.6, Dia.=115′, DC=3; Naked Eye; Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 15.44 UT: m1=4.7, Dia.=55′, DC=5; 10x66R (10x); Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 15.13 UT: m1=3.7, Dia.=>90′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 15.12 UT: m1=4.0, Dia.=70′, DC=5; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 15.104 UT: m1=3.7, Dia.=33′, DC=2; 20×80 B; Roger Jimenez (Barquisimeto, Lara, Venezuela, 10°4′ N, 69° 21′ W, Alt. 606m) [MALE: 3.9. Sidgwick method. Tycho-2 comparison stars. Altura: 84°. Pollution. Urban Sky. Moonlight 45%]
2018 Dec. 14.99 UT: m1=4.6, Dia.=30′, DC=2; 10-cm R f/5(20x) … Willian Souza (Sao Paulo, Brazil)
2018 Dec. 14.98 UT: m1=4.6, Dia.=30′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2018 Dec. 14.97 UT: m1=4.0, Dia.=75′, DC=3; 3.3-cm R(5x); Carlos Labordena (Castellón, España)
2018 Dec. 14.97 UT: m1=4.5, Dia.=30′, DC=3; 10×42 B; Willian Souza (Sao Paulo, Brazil)
2018 Dec. 14.62 UT: m1=4.3, Dia=76.5’, DC=5/; 1.6×28 R; Chris Wyatt (Walcha, NSW, Australia) [Magnitude estimate made using 50mm f/1.8 camera lens as an objective and 32mm Plossl eyepiece, hand-held, giving a magnification of x1.6 (Aperture rounded to 28.0mm). Coma well condensed, appears stellar sometimes. Easily visible naked eye. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 14.42 UT: m1=3.4, Dia.=95′, DC=4; Naked Eye; Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 14.42 UT: m1=4.7, Dia.=60′, DC=5; 10x66R (10x); Seiichi Yoshida (Kapalua, Maui, Hawaii)
2018 Dec. 14.13 UT: m1=3.7, Dia.=>90′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 14.12 UT: m1=4.0, Dia.=70′, DC=5; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 14.00 UT: m1=4.1, Dia.=75′, DC=4; Naked Eye; Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain. Alt. 1190 m, 42º 46′ N, 5º 53′ W) [In 12×45 monocular: m1=4.2, Dia.=65′, DC=4. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Dec. 13.98 UT: m1=4.6, Dia.=30′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2018 Dec. 13.83 UT: m1=4.5, Dia.=45′, DC=5;15×70 B; Danil Sidorko (Korenovsk, Russia) [very good visible with the naked eye]
2018 Dec. 13.21 UT: m1=3.9, Dia.=70′, DC=3; Naked Eye; Seiichi Yoshida (Mauna Kea, Hawaii)
2018 Dec. 13.21 UT: m1=4.8, Dia.=50′, DC=4; 10x66R (10x); Seiichi Yoshida (Mauna Kea, Hawaii)
2018 Dec. 13.10 UT: m1=3.7:, Dia.=>90′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 13.09 UT: m1=4.0:, Dia.=70′, DC=5; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 13.09 UT: m1=4.2, Dia.=15’, DC=3; 15×70 B; Mariano Ribas (Buenos Aires, Argentina) [El cometa es imposible de ver a simple vista en cielo urbano, aunque es más fácil de detectar ¨que hace una semana con los mismos binoculares 15×70)
2018 Dec. 13.041 UT: m1=3.7, Dia.=55′, DC=3; Naked eye; Roger Jimenez (COAT, Lara, Venezuela) [MALE: 5.3. Altura: 64°. Luna a 21° altura sobre el horizonte Oeste-Sur-Oeste, 26% iluminada]
2018 Dec. 13.024 UT: m1=3.8, Dia.=39′, DC=3; 20×80 B; Roger Jimenez (COAT, Lara, Venezuela) [MALE: 5.3. Método: Sidgwick. Comparación de estrellas usando datos del catálogo Tycho-2. Altura: 58°. Luna a 30° altura sobre el horizonte Oeste-Sur-Oeste, 26% iluminada]
2018 Dec. 13.023 UT: m1=3.8, Dia.=39′, DC=3; 20×80 B; Oscar Alvarado (COAT, Lara, Venezuela) [MALE: 5.3. Método: Sidgwick. Comparación de estrellas usando datos del catálogo Tycho-2. Altura: 58°. Luna a 30° altura sobre el horizonte Oeste-Sur-Oeste, 26% iluminada]
2018 Dec. 13.022 UT: m1=3.8, Dia.=39′, DC=3; 20×80 B; Jesús Guerrero (COAT, Lara, Venezuela) [MALE: 5.3. Método: Sidgwick. Comparación de estrellas usando datos del catálogo Tycho-2. Altura: 58°. Luna a 30° altura sobre el horizonte Oeste-Sur-Oeste, 26% iluminada]
2018 Dec. 13.021 UT: m1=3.8, Dia.=39′, DC=3; 20×80 B; Ángel Reyes (COAT, Lara, Venezuela) [MALE: 5.3. Método: Sidgwick. Comparación de estrellas usando datos del catálogo Tycho-2. Altura: 58°. Luna a 30° altura sobre el horizonte Oeste-Sur-Oeste, 26% iluminada]
2018 Dec. 12.34 UT: m1=4.1, Dia.=50′, DC=1; Naked Eye, Seiichi Yoshida (Kailua Kona, Hawaii)
2018 Dec. 12.33 UT: m1=4.9, Dia.=40′, DC=4; 10x66R (10x); Seiichi Yoshida (Kailua Kona, Hawaii)
2018 Dec. 12.18 UT: m1=4.8, Dia.=>30′, DC=3; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 12.07 UT: m1=3.8, Dia.=>90′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 12.06 UT: m1=4.1, Dia.=70′, DC=5; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 12.06 UT: m1=4.5:, Dia.=30′, DC=2; Naked Eye; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 12.05 UT: m1=4.8, Dia.=60′, DC=4; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 12.04 UT: m1=4.5, Dia.=50’, DC=4; 10×50 B; Alberto Anunziato (Paraná, Argentina) [No tail, Mét. Sidgwick, Cat. Tycho II]
2018 Dec. 11.86 UT: m1=4.1, Dia.=70′, DC=4/; Naked Eye; Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [In 12×45 monocular: m1=4.3, Dia.=65′, DC=4. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2. Mountain location, very clear sky]
2018 Dec. 11.20 UT: m1=4.9:, Dia.=45′, DC=3; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 11.07 UT: m1=3.9, Dia.=90′, DC=3/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 11.06 UT: m1=4.2, Dia.=60′, DC=4/; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [By using 20×100 B and refletor 22-cm L(32x): Tail= 30′ in PA: 55 deg. (in the reflector I could see 3 tails, in PA: 15, 55 and 80 respectively]
2018 Dec. 11.03 UT: m1=4.8, Dia.=60′, DC=4; 10×70 B; Jorge Luis Salas (San Diego, Carabobo, Venezuela)
2018 Dec. 11.01 UT: m1=4.5:, Dia.=60′, DC=2; Naked Eye; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 10.99 UT: m1=4.8, Dia.=60′, DC=4; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 10.80 UT: m1=4.7, Dia.=35′, DC=5; 15×70 B; Danil Sidorko (Korenovsk, Russia)
2018 Dec. 10.47 UT: m1=4.4, Dia.=84’, DC=5; 1.6×28 R; Chris Wyatt (Walcha, NSW, Australia) [Magnitude estimate made using 50mm f/1.8 camera lens as an objective and 32mm Plossl eyepiece, hand-held, giving a magnification of x1.6 (Aperture rounded to 28.0mm). Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 10.46 UT: m1=4.4, Dia.=84’, DC=4; Naked Eye; Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Coma very large and diffuse. Enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 10.46 UT: m1=4.5, Dia.=63’, DC=5; 3.3×28 R; Chris Wyatt (Walcha, NSW, Australia) [Magnitude estimate made using 50mm f/1.8 camera lens as an objective and 15mm Plossl eyepiece, hand-held, giving a magnification of x3.3 (Aperture rounded to 28.0mm). Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 10.45 UT: m1=4.8, Dia.=56’, DC=4/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma transparent, inner coma opaque, moderately condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 10.44 UT: m1=5.3, Dia.=25′, DC=1; 10x66R (10x); Seiichi Yoshida (Honolulu, Hawaii)
2018 Dec. 10.01 UT: m1=4.0:, Dia.=70′, DC=3; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2018 Dec. 10.01 UT: m1=5.0:, Dia.=20′, DC=3; 10×42 B; Willian Souza (Sao Paulo, Brazil)
2018 Dec. 10.00 UT: m1=4.2:, Dia.=45′, DC=4; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2018 Dec. 09.99 UT: m1=5.0, Dia.=20′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2018 Dec. 09.91 UT: m1=4.8, Dia.=40’, DC=3; 10×50 B; Alberto Anunziato (Paraná, Argentina) [Cola:NO. Mét. Sidgwick, Cat. Tycho II]
2018 Dec. 09.87 UT: m1=5.1, Dia.=42′, DC=3; 5×25 B; Valentín Díaz (La Romaneta, Alicante, España)
2018 Dec. 09.86 UT: m1=5.2, Dia.=42′, DC=3; 10×50 B; Valentín Díaz (La Romaneta, Alicante, España)
2018 Dec. 09.80 UT: m1=4.5, Dia.=36′, DC=5, 15×70 B + Naked Eye; Danil Sidorko (Korenovsk, Russia)
2018 Dec. 09.33 UT: m1=5.0, Dia.=40’, DC=3; 10×50 B; Alberto Anunziato (Paraná, Argentina) [Cola:NO. Mét. Sidgwick, Cat. Tycho II]
2018 Dec. 09.21 UT: m1=4.3, Dia.=60′, DC=4; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 09.088 UT: m1=4.2 Dia.=27′, DC=4; 20-cm SCT f/10(50x); Roger Jimenez (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación Tycho-2. Altura: 89°]
2018 Dec. 09.087 UT: m1=4.2 Dia.=27′, DC=4; 20-cm SCT f/10(50x); Oscar Alvarado (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación Tycho-2. Altura: 89°]
2018 Dec. 09.086 UT: m1=4.2 Dia.=27′, DC=4; 20-cm SCT f/10(50x); Jesús Guerrero (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación Tycho-2. Altura: 89°]
2018 Dec. 09.085 UT: m1=4.2 Dia.=27′, DC=4; 20-cm SCT f/10(50x); Ángel Reyes (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación Tycho-2. Altura: 89°]
2018 Dec. 09.066 UT: m1=3.9, Dia.=74′, DC=3; 20×80 B; Roger Jimenez (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación: Tycho-2. Altura: 76°]
2018 Dec. 09.065 UT: m1=3.9, Dia.=74′, DC=3; 20×80 B; Oscar Alvarado (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación: Tycho-2. Altura: 76°]
2018 Dec. 09.064 UT: m1=3.9, Dia.=74′, DC=3; 20×80 B; Jesús Guerrero (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación: Tycho-2. Altura: 76°]
2018 Dec. 09.063 UT: m1=3.9, Dia.=74′, DC=3; 20×80 B; Ángel Reyes (COAT, Lara, Venezuela) [MALE: 6.10. Método: Sidgwick. Comparación: Tycho-2. Altura: 76°]
2018 Dec. 09.06 UT: m1=4.5, Dia.=35’, DC=3; 15×70 B; Mariano Ribas (Pardo, Pcia. de Buenos Aires, Argentina) [La coma del cometa presenta una baja concentración y, visualmente, un débil tono gris verdoso que se hace más patente cerca del núcleo. A simple vista es un objeto poco llamativo, aunque mucho más patente con visión avertida)
2018 Dec. 09.05 UT: m1=5.0, Dia.=85′, DC=4; 10×70 B; Jorge Luis Salas (San Diego, Carabobo, Venezuela)
2018 Dec. 08.99 UT: m1=5.0, Dia.=88′, DC=4; 11.4-cm L(60x); Jorge Luis Salas (San Diego, Carabobo, Venezuela)
2018 Dec. 08.93 UT: m1=4.6, Dia.=60′, DC=3; 3.3-cm R(5x); Carlos Labordena (Castellón, España)
2018 Dec. 08.80 UT: m1=4.5, Dia.=45′, DC=3; 15×70 B + Naked Eye; Danil Sidorko (Korenovsk, Russia) [in culmination, alt= 40 degrees above the horizon]
2018 Dec. 08.70 UT: m1=4.7, Dia.=25′, DC=2/; 15×70 B; Danil Sidorko (Korenovsk, Russia) [alt= 30 degrees above the horizon]
2018 Dec. 08.50 UT: m1=4.4, Dia.=60′; Naked Eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Dec. 08.48 UT: m1=4.9, Dia.=63.5’, DC=3; Naked Eye; Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Coma large and diffuse, opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 08.47 UT: m1=4.9, Dia.=53’, DC=5; 3.3×28 R; Chris Wyatt (Walcha, NSW, Australia) [Magnitude estimate made using 50mm f/1.8 camera lens as an objective and 15mm Plossl eyepiece, hand-held, giving a magnification of x3.3 (Aperture rounded to 28.0mm) Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 08.47 UT: m1=4.8, Dia.=44’, DC=5; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Transparent outer coma gradually brightening to an opaque inner coma and well condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 08.04 UT: m1=5.2, Dia.=80′, DC=3; 10×70 B; Jorge Luis Salas (San Diego, Carabobo, Venezuela)
2018 Dec. 07.95 UT: m1=5.1, Dia.=35′, DC=2; 5×25 B; Valentín Díaz (Elche capital, España)
2018 Dec. 07.49 UT: m1=4.4:; Naked eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Dec. 07.47 UT: m1=5.0, Dia.=49’, DC=5; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Visible naked eye but close to stars. Star on NE edge of coma. Coma very opaque, well condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 07.20 UT: m1=5.0, Dia.=30′, DC=3; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 07.04 UT: m1=4.4, Dia.=60′, DC=4; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 07.05 UT: m1=4.1:, Dia.=80′, DC=3; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 06.99 UT: m1=5.1, Dia.=>30′, DC=3; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 06.83 UT: m1=5.0, Dia.=65′, DC=3/; 12×45 monocular; Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Several stars inside the coma, the brightest being mag. 3.9 (TK), not allowing a naked eye estimate. Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 06.50 UT: m1=4.7, Dia.=60′; Naked Eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Dec. 06.45 UT: m1=4.8, Dia.=55’, DC=3; Naked Eye; Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Large coma, opaque centre, diffuse outer. Enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Dec. 06.45 UT: m1=5.1, Dia.=48’, DC=5; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, brightening to a well condensed opaque centre. Pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 06.22 UT: m1=5.1, Dia.=>30′, DC=3; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 06.05 UT: m1=4.2:, Dia.= 80′, DC=3; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 06.04 UT: m1=4.5, Dia.= 60′, DC=4; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 06.04 UT: m1=4.8, Dia.=36′, DC=2; 20×80 B; Roger Jimenez (Barquisimeto, Venezuela) [MALE: 4.25. Método: Sidgwick. Comparación: carta X23594PO AVSSO. Altura: 57°]
2018 Dec. 06.04 UT: m1=5.2, Dia.=30′, DC=3; 10×50 B; Willian Souza (Santa Rita do Sapucai, Brazil)
2018 Dec. 05.90 UT: m1=4.7, Dia.=60′, DC=3; 3.3-cm R(5x); Carlos Labordena (Castellón, España)
2018 Dec. 05.04 UT: m1=4.9, Dia.=27′, DC=2; 20×80 B; Roger Jimenez (Barquisimeto, Venezuela) [MALE: 4.25. Método: Sidgwick. Comparación: carta X23582BE AVSSO. Altura: 56°]
2018 Dec. 04.10 UT: m1=4.3:, Dia.=75′, DC=2/; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 04.09 UT: m1=4.5, Dia.=50′, DC=3; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 03.91 UT: m1=5.6, Dia.=40′, DC=2; 10×50 B; Valentín Díaz (La Romana, Alicante, España)
2018 Dec. 03.50 UT: m1=4.8, Dia.=75′; Naked Eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Dec. 03.02 UT: m1=5.5, Dia.=20′, DC=2; 20×80 B; Roger Jimenez (Barquisimeto, Venezuela) [light pollution]
2018 Dec. 02.05 UT: m1=5.0, Dia.=40′, DC=3; 45-cm L f/4.4(50x); Roger Jimenez (COAT, Lara, Venezuela)
2018 Dec. 02.04 UT: m1=5.0, Dia.=40′, DC=3; 45-cm L f/4.4(50x); Jesús Guerrero (COAT, Lara, Venezuela)
2018 Dec. 02.03 UT: m1=5.0, Dia.=40′, DC=3; 45-cm L f/4.4(50x); Geonell Romero (COAT, Lara, Venezuela)
2018 Dec. 02.02 UT: m1=5.0, Dia.=40′, DC=3; 45-cm L f/4.4(50x); Rebeca Mendoza (COAT, Lara, Venezuela)
2018 Dec. 01.50 UT: m1=5.6, Dia.=28′, DC=3; 10x70R; Seiichi Yoshida (Gunma, Japan)
2018 Dec. 01.49 UT: m1=5.1:; Naked Eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Dec. 01.44 UT: m1=5.1, Dia.=56’, DC=3; Naked Eye; Chris Wyatt (Walcha, NSW, Australia) [Naked eye; Coma diffuse, sometimes appears faintly stellar in periods of good seeing. Observing altitude at 1250m, approximately 30kms East of Walcha. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Dec. 01.43 UT: m1=5.4, Dia.=48’, DC=4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, opaque centre, pale-aqua blue in colour, enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 30.93 UT: m1=5.3, Dia.=35′, DC=3; 10-cm B(25x); Carlos Labordena (Castellón, España)
2018 Nov. 30.81 UT: m1=4.7, Dia.=80′, DC=3; Naked Eye; Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [In 12×45 monocular: m1=4.8, Dia.=110′, DC=2/. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2018 Nov. 30.51 UT: m1=4.9, Dia.=60; Naked Eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Nov. 30.44 UT: m1=5.2, Dia.=58’, DC= 3; Naked Eye; Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Coma was easier to see when curling thumb and forefinger around my eye to reduce my field of view, gradually became easier to spot directly once fully dark adapted. Sometimes appears stellar in good seeing. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 30.43 UT: m1=5.6, Dia.=28′, DC=2; 10x70R; Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.43 UT: m1=5.6, Dia.=37’, DC=4/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Very small white centre surrounded by opaque inner coma, gradually fading to transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 30.08 UT: m1=5.9, Dia.=20′, DC=2/; 20×80 B; Roger Jimenez (Barquisimeto, Venezuela) [Polución]
2018 Nov. 29.79 UT: m1=6.8, Dia.=25′, DC=3; 6-cm B(20x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.44]
2018 Nov. 29.48 UT: m1=5.3, Dia.=72.0’, DC=3; Naked Eye; Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Limiting magnitude= 6.5, With Swan Band filter the coma appears slightly larger. Very diffuse, almost directly overhead. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 29.48 UT: m1=5.7, Dia.=37’, DC=4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Large transparent outer coma, gradually brightening to an opaque inner coma, aqua-blue in colour, with a moderately condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 29.04 UT: m1=5.0:, Dia.=60′, DC=2; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 29.03 UT: m1=5.2, Dia.=45′, DC=2/; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 28.88 UT: m1=6.8, Dia.=11’, DC=2; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 28.19 UT: m1=5.4, Dia.=55′, DC=2/; 20×80 B; Roger Jimenez (COAT, Saroche, Venezuela)
2018 Nov. 28.18 UT: m1=5.4, Dia.=55′, DC=2/; 20×80 B; Oscar Alvarado (COAT, Saroche, Venezuela)
2018 Nov. 28.17 UT: m1=5.4, Dia.=55′, DC=2/; 20×80 B; Angel Reyes (COAT, Saroche, Venezuela)
2018 Nov. 28.08 UT: m1=5.3, Dia.=45′, DC=2/; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 27.84 UT: m1=5.6, Dia.=20′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 Nov. 27.04 UT: m1=5.2:, Dia.=60′, DC=2; Naked Eye; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 27.03 UT: m1=5.4, Dia.=45′, DC=2/; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 26.96 UT: m1=6.4, Dia.=15′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2018 Nov. 26.47 UT: m1=5.0, Dia.=45′; Naked Eye; David A. J. Seargent (Cowra, NSW, Australia) [Enhanced through Swan Band filter]
2018 Nov. 26.42 UT: m1=5.7, Dia.=36’, DC=4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Mag 8.3 star in coma. Comet was faintly visible naked eye but difficult to obtain a naked eye magnitude estimate, however, the naked eye coma diameter was made out to about 1 degree. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 26.00 UT: m1=5.4, Dia.= 40′, DC=2; 4×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 25.42 UT: m1=6.1, Dia.=28’, DC=4; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Close to mag 6.4 star, at the Western edge of coma. Moderately condensed, semi-transparent outer coma, opaque inner coma. Possible naked eye but too close to star to be certain. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Nov. 24.41 UT: m1=6.0, Dia.=30’, DC=3/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Sky slightly hazy with thin cloud, moon rising. Windy conditions. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Nov. 22.08 UT: m1=5.5:, Dia.=30′, DC=2; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [strong moonlight]
2018 Nov. 20.91 UT: m1=7.1, Dia.=7′, DC=2; 8-cm B(11x); Carlos Labordena (Castellón, España)
2018 Nov. 17.96 UT: m1=6.4, Dia.=10′, DC=3; 15×70 B; Willian Souza (Sao Paulo, Brazil)
2018 Nov. 17.69 UT: m1=5.9; Naked eye; David A. J. Seargent (Cowra, NSW, Australia)
2018 Nov. 17.69 UT: —, Dia.=24′; 10×50 B; David A. J. Seargent (Cowra, NSW, Australia)
2018 Nov. 16.00 UT: m1=5.7, Dia.=32′, DC=2/; 12×45 monocular; Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Altitude: 15 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Nov. 14.08 UT: m1=6.7, Dia.=28′, DC=3; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 13.98 UT: m1=6.8, Dia.=10′, DC=3; 10-cm R f/5(34x); Willian Souza (Sao Paulo, Brazil);
2018 Nov. 13.08 UT: m1=6.8, Dia.=25′, DC=3; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 13.00 UT: m1=6.2, Dia.=27′, DC=2/; 12×45 monocular; Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1280 m, 43º 10′ N, 5º 54′ W) [Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 Nov. 12.04 UT: m1=6.8, Dia.=25′, DC=3; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 11.67 UT: m1=6.6, Dia.=28’, DC=3; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Bright stars in coma, opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Nov. 11.17 UT: m1=6.9, Dia.=25′, DC=3; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 10.98 UT: m1=8.2, Dia.=11′, DC=2; 20×80 B; Valentín Díaz (La Romana, Alicante, España)
2018 Nov. 10.64 UT: m1=7.3, Dia.=29’, DC=3/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma large, diffuse, moderately condensed. Enhances in Swan Band filter. Faint stars in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 08.49 UT: m1=7.3, Dia.=28’, DC=3; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma large, circular, diffuse opaque centre. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Nov. 06.89 UT: m1=8.4, Dia.=10’, DC=2; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 06.06 UT: m1=7.8, Dia.=20′, DC=2/; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 06.05 UT: m1=7.9, Dia.=18′, DC=3; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 05.93 UT: m1=7.6, Dia.=12′, DC=3; 15-cm T(30x); Carlos Labordena (Castellón, España)
2018 Nov. 05.15 UT: m1=7.9, Dia.=18′, DC=2; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 05.14 UT: m1=8.1, Dia.=15′, DC=2/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 04.01 UT: m1=7.4, Dia.=15′, DC=3; 10×50 B; Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Altitude: 14 deg. In 25x100B: m1=7.7, Dia.=12′, DC=3. In 20 cm SCT (77x): m1=8.1, Dia.=9′, DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Nov. 03.63 UT: m1=8.5, Dia.=7′, DC=2; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 03.41 UT: m1=7.7, Dia.=20’, DC=3; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma close to faint stars, slight interference. Very tenuous outer coma. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 02.99 UT: m1=8.0, Dia.=18′, DC=2; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 02.98 UT: m1=8.2, Dia.=15′, DC=2/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 31.08 UT: m1=8.3, Dia.=12′, DC=2/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 31.09 UT: m1=8.1, Dia.=14′, DC=2; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 30.51 UT: m1=8.0, Dia.=12′; 10×50 B; David A. J. Seargent (Cowra, NSW, Australia) [Also visible in 6×35 binoculars]
2018 Oct. 30.43 UT: m1=8.4, Dia.=22’, DC=3/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faint stars in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 30.08 UT: m1=8.4, Dia.=10′, DC=2/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 30.09 UT: m1=8.2, Dia.=12′, DC=2; 7×50 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 29.89 UT: m1=8.8, Dia.=5′, DC=2; 20-cm SCT(50x); Carlos Labordena (Castellón, España)
2018 Oct. 29.46 UT: m1=7.9, Dia.=15′; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia)
2018 Oct. 29.42 UT: m1=8.6, Dia.=20’, DC=3/; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slightly brighter and opaque in centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Oct. 29.06 UT: m1=8.7, Dia.=6′, DC=3; 25-cm L(45x); Gonzalo Vargas (Cochabamba, Bolivia) [Wide coma and very diffuse centre, more clear view using an SkyGlow filter]
2018 Oct. 29.06 UT: m1=8.6, Dia.=8′, DC=2/; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil) [clouds]
2018 Oct. 27.40 UT: m1=8.5, Dia.=20’, DC=3; 7×50 B; Chris Wyatt (Walcha, NSW, Australia) [Very diffuse coma, opaque centre. Coma centre enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Oct. 22.06 UT: m1= 9.5, Dia.=5′, DC=2/; 22-cm L (60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil);[ moonlight; little enhancement with comet filter ]
2018 Oct. 20.11 UT: m1=9.2, Dia.=8′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Altitude: 11 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Oct. 16.07 UT: m1=9.6, Dia.=7′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Mag. 11.2 (TK) star in coma. Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Oct. 13.21 UT: m1=10.3, Dia.=4′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 08.44 UT: m1=9.9, Dia.=10.2’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma very large and diffuse, enhances well in Swan band filter. Semi-transparent outer coma, slightly more condensed at centre and opaque. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 07.71 UT: m1=11.9, Dia.=3.0′, DC=3/; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.61 UT: m1=11.4, Dia.=1.7′, DC=3/; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.21 UT: m1=11.4, Dia.=2′, DC=2; 22-cm L(160x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 04.00 UT: m1=10.6, Dia.=4′, DC=2/; 20-cm SCT (77x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Altitude: 18 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2018 Oct. 01.42 UT: m1=10.9, Dia.=4.8’, DC=2; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse and difficult, weakly condensed. Enhances with Swan Band filter applied and the coma appears to be a little larger. Sky slightly hazy. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Sep. 30.96 UT: m1=11.7, Dia.=1.5′, DC=2, no tail; 23.5-cm SCT(138x); Carlos Labordena (Castellón, España)
2018 Sep. 27.40 UT: m1=11.0, Dia.=5’, DC=2/; 25-cm L f:5 (39x); Chris Wyatt (Walcha, NSW, Australia) [Moonlight interference. Moon -2.1° altitude. Difficult, very diffuse and weakly condensed. Enhances slightly in Swan Band filter. Low altitude= 17.2°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Sep. 19.12 UT: m1=11.6, Dia.=2.0′, DC=2/; 20-cm SCT(133x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Altitude: 25 deg. Observation made under better conditions, providing a wider coma diameter and brighter magnitude estimate in comparison with my previous Sep. 10 observation. Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 Sep. 18.73 UT: m1=12.4, Dia.=3.4’, DC=2; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter. Very diffuse. Sky slightly hazy due to dust. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Sep. 17.70 UT: m1=[13.4, negative; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 16.70 UT: m1=[13.6, negative; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 10.10 UT: m1=12.4, Dia.=1.5′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Altitude: 27 deg. Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 Sep. 09.74 UT: m1=13.6, Dia.=1.3’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

38P/Stephan-Oterma 
2019 Mar. 11.73 UT: m1=15.4 CCD, Dia.=0.30′, DC=7/, Tail=2.6′ in PA: 133 deg.; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2019 Feb. 26.83 UT: m1=11.7, Dia.=2’, DC=3; 20-cm L f:4(42x); Martin Lehky (Czech Republic)
2019 Feb. 25.79 UT: m1=11.7, Dia.=2’, DC=3; 20-cm L f:4(42x); Martin Lehky (Czech Republic)
2019 Feb. 24.92 UT: m1=11.5, Dia.=2′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54′ N, 5º 48′ W, alt. 1530 m) [Sidgwick method. APASS comparison stars. SQM: 21.5]
2019 Feb. 23.50 UT: m1=12.6, Dia.=1.8′, DC=3; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Ibaraki, Japan)
2019 Feb. 12.81 UT: m1=11.1, Dia.=2’, DC=3; 16-cm R f:11(45x); Martin Lehky (Czech Republic)
2019 Feb. 05.86 UT: m1=11.3, Dia.=2′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Jan. 25.88 UT: m1=11.3, Dia.=2′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Jan. 25.82 UT: m1=10.5, Dia.=5′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Villacintor, Leon, Spain. Alt. 930 m, 42º 29′ N, 5º 11′ W) [Mag. 12.4 (APASS) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Jan. 24.74 UT: m1=10.5, Dia.=1.8′, DC=3; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.19]
2019 Jan. 21.19 UT: m1=11.0, Dia.=2.5′, DC=2/; 25.4-cm L f:5(64x); Maik Meyer (Linter, Germany) [all obs during total lunar eclipse]
2019 Jan. 14.64 UT: m1=10.4, Dia.=5.0’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Coma faint and diffuse, opaque centre. Outer coma enhances in Swan Band filter, inner coma dims. Low altitude= 13.9°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Jan. 14.08 UT: m1=10.3, Dia.=4′, DC=3/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2019 Jan. 13.05 UT: m1=10.5, Dia.=3.5′, DC=4; 25-cm L (66x); Valentín Díaz (La Romaneta, Alicante, España)
2019 Jan. 12.60 UT: m1=10.4, Dia.=5.5’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter, diffuse coma, moderately condensed centre. Low altitude= 14.5°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Jan. 11.24 UT: m1=11.0, Dia.=2′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Jan. 08.70 UT: m1=10.2, Dia.=1.5′, DC=2.5; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.42]
2019 Jan. 06.84 UT: m1=9.9, Dia.=5′, DC=3/, Tail= 0.15 deg. in PA: 260 deg.; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0; 21.2 at zenith]
2019 Jan. 06.82 UT: m1=10.5, Dia.=3′, DC=6/; 40.0-cm Lf/4.5 (75x); Seiichi Yoshida (Ibaraki, Japan)
2019 Jan. 04.87 UT: m1=9.9, Dia.=5′, DC=3, Tail= 0.15 deg. in PA: 260 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Les Retuertes – Sierra del Aramo, Asturias, Spain. alt. 1350 m, 43º 10′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0; 21.3 at zenith]
2019 Jan. 03.21 UT: m1=10.9, Dia.=2.5′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2019 Jan. 01.85 UT: m1=9.9, Dia.=5′, DC=3/, Tail= 0.15 deg. in PA: 260 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Dec. 31.62 UT: m1=10.1, Dia.=5′, DC=6/; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 30.92 UT: m1=10.3, Dia.=4′, DC=4; 27-cm SCT(58x); Valentín Díaz (Cancárix, Albacete, España)
2018 Dec. 30.66 UT: m1=10.0, Dia.=4.5’, DC=3/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Low altitude= 18.8°. Coma diffuse, opaque centre, transparent outer coma, enhances slightly in Swan band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 30.19 UT: m1=10.1, Dia.=3.5′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 29.84 UT: m1=9.7, Dia.=6′, DC=3/, Tail= 0.15 deg. in PA: 260 deg.; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 15.03 UT: m1=9.9, Dia.=3′, DC=3; 20-cm T(80x); Carlos Labordena (Castellón, España)
2018 Dec. 14.23 UT: m1=9.5, Dia.=5′, DC=3/; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 14.05 UT: m1=10.2, Dia.=4′, DC=3/, Tail= 0.2 deg. in PA: 270 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Trichero – Soto y Amio, Leon, Spain. Alt. 1190 m, 42º 46′ N, 5º 53′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Dec. 13.83 UT: m1=9.8, Dia.=3′, DC=3; 13-cm L F:5(25x); Danil Sidorko (Korenovsk, Russia)
2018 Dec. 09.80 UT: m1=9.6, Dia.=3.2′, DC=4; 13-cm L F:5(25x); Danil Sidorko (Korenovsk, Russia)
2018 Dec. 09.25 UT: m1=9.5, Dia.=5′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 07.14 UT: m1=9.4, Dia.=5′, DC=3/, Tail= 0.2 deg. in PA: 260 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars]
2018 Dec. 05.94 UT: m1=10.2, Dia.=3′, DC=4; 15-cm T(44x); Carlos Labordena (Castellón, España)
2018 Dec. 01.75 UT: m1=10.5, Dia.=3.3′, DC=4; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.86 UT: m1=10.7 CCD, Dia.=1.22′, DC=6; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2018 Nov. 30.62 UT: m1=9.8, Dia.=3.0′, DC=6; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 29.83 UT: m1=10.3, Dia.=1.8′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.47]
2018 Nov. 27.87 UT: m1=11.7 CCD, Dia.=1.11′, DC=6/, Tail=2.6′ in PA: 258 deg.; 0.25-m f/4.7 Newton + CCD; Sergey Shurpakov (Observatory C36, Belarus)
2018 Nov. 20.98 UT: m1=10.1, Dia.=3′, DC=3; 20-cm T(50x); Carlos Labordena (Castellón, España)
2018 Nov. 18.00 UT: m1=9.8, Dia.=3′, DC=3/; 25.4-cm L(64x); Maik Meyer (Limburg, Germany)
2018 Nov. 17.94 UT: m1=9.4, Dia.=4.5’, DC=3; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 17.68 UT: m1=9.8; Dia.=4′; 25×100 B; David A. J. Seargent (Cowra, NSW, Australia)
2018 Nov. 17.01 UT: m1=9.7, Dia.=3′, DC=3/; 25.4-cm L(64x); Maik Meyer (Limburg, Germany)
2018 Nov. 16.94 UT: m1=9.6, Dia.=4’, DC=3/; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 16.13 UT: m1=9.5, Dia.=5′, DC=3, Tail= 0.15 deg. in PA: 260 deg.; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Several stars inside the coma, the brightest being mag. 11.3 (HS). Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Nov. 16.13 UT: m1=10.0, Dia.=2.5′, DC=5; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.30]
2018 Nov. 14.05 UT: m1=11.1, Dia.=1.5′, DC=6; 60-cm L(81x); Sandor Szabo (Sopron, Hungary)
2018 Nov. 13.15 UT: m1=9.4, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1280 m, 43º 10′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Nov. 13.10 UT: m1=9.5, Dia.=1.5′, DC=4/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.65]
2018 Nov. 11.70 UT: m1=10.4, Dia.=5.5’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Faint star in coma, very diffuse outer coma. Moderately condensed opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 11.21 UT: m1=9.3, Dia.=5′, DC=2; 20×100 B; Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 11.02 UT: m1=10.0, Dia.=7′, DC=4; 25-cm L(57x); Valentín Díaz (La Romana, Alicante, España)
2018 Nov. 10.67 UT: m1=9.8, Dia.=4’, DC=5/; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, sometimes faintly stellar. Semi-transparent outer coma. Enhances in Swan Band filter. Close to star. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat=TK]
2018 Nov. 09.17 UT: m1=9.3, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Collada del Fresno – Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10′ N, 5º 54′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Nov. 06.98 UT: m1=9.5, Dia.=4’, DC=4; 25×100 B; Martin Lehky (Czech Republic)
2018 Nov. 05.96 UT: m1=9.8, Dia.=4′, DC=3; 15cm T(30x); Carlos Labordena (Castellón, España)
2018 Nov. 05.19 UT: m1=9.7, Dia.=3′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 05.06 UT: m1=10.4, Dia.=1.5′, DC=4/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.48]
2018 Nov. 04.00 UT: m1=9.0, Dia.=6′, DC=3; 25×100 B; Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47′ N, 6º 00′ W) [In 20 cm SCT (77x) : m1=9.1, Dia.=6′, DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Nov. 03.65 UT: m1=10.0, Dia.=6′, DC=3/; 40.0-cm L f/4.5(36x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 22.25 UT: m1= 10.0, Dia.=3′, DC=3; 22-cm L (60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight; clouds]
2018 Oct. 21.08 UT: m1=11.1, Dia.=0.8′, DC=5; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.75]
2018 Oct. 22.16 UT m1=10.2, Dia.=3.4′, DC=2; 25.4-cm L f/5(64x); Maik Meyer (Limburg, Germany)
2018 Oct. 17.06 UT: m1=11.1, Dia.=1.3′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 Oct. 16.16 UT: m1=10.3, Dia.=2.9′, DC=3; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 16.08 UT: m1=9.1, Dia.=7′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Oct. 15.15 UT: m1=10.3, Dia.=2.8′, DC=3; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 14.09 UT: m1=10.3 Dia.=3.8′, DC=3; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 13.31 UT: m1=10.1, Dia.=3′, DC=4; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil) [clouds, very near stars with m1: 9.90 and m1:10.85]
2018 Oct. 13.00 UT: m1=12.8 CCD, Dia.=0.57′, DC=6/; 0.20-m f/4 Schmidt-Newton + CCD; S. Shurpakov (Observatory A98, Belarus)
2018 Oct. 12.12 UT: m1=12.5 CCD, Dia.=0.44′, DC=6/; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Oct. 12.06 UT: m1=11.2, Dia.=1.5′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.48]
2018 Oct. 11.15 UT: m1=10.6, Dia.=2.6′, DC=3; 25.4-cm L f/5(64x); Maik Mayer (Limburg, Germany)
2018 Oct. 08.12 UT: m1=10.7, Dia.=1.9′, DC=2/; 25.4-cm L f/5 (64x); Maik Meyer (Limburg, Germany)
2018 Oct. 07.71 UT: m1=11.4, Dia.=3.2′, DC=5/; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 07.07 UT: m1=10.7, Dia.=2′, DC=3, no tail; 20-cm T(58x); Carlos Labordena (Castellón, España)
2018 Oct. 07.02 UT: m1=11.1, Dia.=1.7′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S]
2018 Oct. 06.77 UT: m1=10.9, Dia.=2.4′, DC=6; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.23 UT: m1=10.5, Dia.=3′, DC=3; 22-cm L(60x); Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 06.14 UT: m1=10.5:, Dia.=2.4′, DC=2; 25.4-cm L f/5 (64x); Maik Meyer (Limburg, Germany)
2018 Oct. 04.99 UT: m1=13.2 CCD, Dia.=0.37′, DC=7/; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Oct. 04.02 UT: m1=9.9, Dia.=5′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez ( Aralla, Leon, Spain, Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Asymmetric coma. Altitude: 20 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 Sep. 22.04 UT: m1=11.7, Dia.=1′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.63]
2018 Sep. 22.00 UT: m1=13.6 CCD, Dia.=0.30′, DC=7/; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Sep. 19.17 UT: m1=10.0, Dia.=6′, DC=2; 20-cm SCT (77x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Mag. 12.1 (APASS) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Sep. 18.74 UT: m1=12.4, Dia.=1.8’, DC=6; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to bright star. Small stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 17.68 UT: m1=11.5, Dia.=1.3′, DC=6; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 17.02 UT: m1=12.4, Dia.=1′, DC=3; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.44]
2018 Sep. 16.69 UT: m1=11.4, Dia.=2.3′, DC=4/; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Sep. 15.00 UT: m1=14.0 CCD, Dia.=0.44′, DC=4/; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Belarus)
2018 Sep. 10.17 UT: m1=9.9, Dia.=5′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Aralla, Leon, Spain; Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Mag. 11.3 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Aug. 24.02 UT: m1=14.7 CCD, Dia.=0.33′, DC=8; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 20.15 UT: m1=10.5, Dia.=5′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Aug. 18.76 UT: m1=12.9, Dia.=1.5’, DC=4; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Diffuse, moderately condensed semi-opaque centre. Does not appear to enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 18.03 UT: m1=14.3 CCD, Dia.=0.33′, DC=7/; 0.20-m f/4 Schmidt-Newton + CCD; Serguey Shurpakov (Observatory A98, Baran’, Belarus)
2018 Aug. 15.76 UT: m1=13.1, Dia.=1.6’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 15.17 UT: m1=10.9, Dia.=3′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Motion followed for a 75-min period. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2018 Aug. 12.05 UT: m1=13.5, Dia.=0.6′, DC=0; 0.60-m f/4 L(244x, 305x); Gabor Santa (Tarján, Hungary) [coma is more diffuse in PA=240, but no tail visible, h=22 deg.]
2018 Aug. 10.17 UT: m1=11.5, Dia.=2.5′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Brighter than expected. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2018 Aug. 08.76 UT: m1=14.1, Dia.=1.2’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Difficult; diffuse coma, slightly brighter in centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

29P/Schwassmann-Wachmann 1  29P_Mag 
2019 Sep. 09.72 UT: m1=[14.0; 40.0-cm L f/4.5(257x); Seiichi Yoshida (Gunma, Japan)
2019 Sep. 05.72 UT: m1=14.7, Dia.=1’, DC=1; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Sep. 03.70 UT: m1=14.6, Dia.=1.4’, DC=1; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, no faint pseudo-nucleus present. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Aug. 28.71 UT: m1=13.8, Dia.=1.6’, DC=1; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, no pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2019 Aug. 27.96 UT: m1=11.0, Dia.=3′, DC=2; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Faint and diffuse outer coma diameter 3′, remnant of previous outbursts. Nearby field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2019 Aug. 22.95 UT: m1=11.5, Dia.=3′, DC=1/; 20-cm SCT(167x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Faint and diffuse outer coma diameter 3′, (remnant of previous outbursts), providing m=11.5. Nearby field stars checked in DSS. Mountain location, very clear sky. Sidgwick method. APASS comparison stars. SQM: 21.2]
2019 Aug. 08.72 UT: m1=14.2, Dia.=0.7’, DC=5/; 40-cm L(108x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small. Very faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 05.00 UT: m1=12.3, Dia.=1.5′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [In outburst. Brighter inner coma diameter 1.5′, providing m=12.3. Faint and diffuse outer coma diameter 4′, remnant of previous outbursts. Central condensation, m2=14.2 (AQ). Nearby field stars checked in DSS. Mountain location, very clear sky. Sidgwick method. APASS comparison stars. SQM: 21.4]
2019 Aug. 03.71 UT: m1=14.4, Dia.=0.4’, DC=6; 40-cm L f:4.5(108x); Chris Wyatt (Walcha, NSW, Australia) [Post-outburst. Faint stellar pseudo-nucleus (m2 approx mag 16.2). Hazy outer coma, no enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2019 Aug. 02.03 UT: m1=12.2, Dia.=1.5′, DC=3; 20-cm SCT(133x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Brighter inner coma diameter 1.5′, providing m=12.2. Faint and diffuse outer coma diameter 4′, remnant of previous outbursts. Nearby field stars checked in DSS. Mountain location, very clear sky. Sidgwick method. APASS comparison stars. SQM: 21.3]
2019 May  31.11 UT: m1=11.2, Dia.=2′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez (Pandorado, Leon, Spain, 42º 47′ N, 6º 00′ W, alt. 1190 m) [In evolution after the recent outburst. Altitude: 12°. Beginning of astronomical twilight. Sidgwick method. APASS comparison stars. SQM: 20.8]
2019  May  08.78 UT: m1=13.7, Dia.=0.5’, DC=6; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 13.9°; Difficult, zodiacal light interference. Coma small, faint stellar centre visible in good seeing. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Jan. 25.80 UT: m1=10.0, Dia.=7′, DC=1; 20-cm SCT (100x); Juan Jose Gonzalez (Villacintor, Leon, Spain. Alt. 930 m, 42º 29′ N, 5º 11′ W) [Faint and diffuse outer coma diameter: 7′, providing m=10.0 (TK), remnant of previous outbursts. Altitude: 24 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2019 Jan. 06.80 UT: m1=10.1, Dia.=6′, DC=1; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Faint and diffuse outer coma diameter: 6′, providing m=10.1, remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars. Several stars inside the coma, the brightest being mag. 12.5 APASS. SQM: 20.9; 21.2 at zenith]
2019 Jan. 01.81 UT: m1=10.1, Dia.=7′, DC=1; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Faint and diffuse outer coma diameter: 7′, providing m=10.1 (TK), remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars. SQM : 21.0]
2018 Dec. 27.44 UT: m1=[14.6, Dia=–, DC=–; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.6 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2018 Dec. 07.44 UT: m1=13.0, Dia.=1.5’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Dec. 06.78 UT: m1=10.3, Dia.=6′, DC=2; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Faint and diffuse outer coma diameter: 6′, providing m=10.3 (TK), remnant of previous outbursts. Several stars inside this outer coma, the brightest being mag. 11.4 (TK). Tycho-2 comparison stars. Brighter inner coma diameter: 1′.3 at 133x, providing m=12.7 (AQ), in evolution after the recent outburst. Sidgwick method]
2018 Dec. 01.39 UT: m1=12.8, Dia.=1.2′, DC=2; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.39 UT: m1=12.5, Dia.=1.3′, DC=5; 40.0-cm L f/4.5(144x); Seiichi Yoshida (Gunma, Japan)
2018 Nov. 28.81 UT: m1=12.3, Dia.=2’, DC=2; 20-cm L f:4(66x); Martin Lehky (Czech Republic)
2018 Nov. 26.43 UT: m1=13.3, Dia.=1.2’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very faint stellar pseudo-nucleus, diffuse outer coma. Post outburst. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Nov. 11.43 UT: m1=12.9, Dia.=1.9’, DC=2; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, difficult. Moonlight. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 08.47 UT: m1=12.3, Dia.=4’, DC=2; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Difficult. Interference by magnitude 12.7 star in coma. Coma large and diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Nov. 06.79 UT: m1=12.4, Dia.=2’, DC=2; 20-cm L f:4(106x); Martin Lehky (Czech Republic)
2018 Nov. 03.84 UT: m1=10.4, Dia.=5′, DC=2; 20-cm SCT(100x); Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47′ N, 6º 00′ W) [Faint and diffuse outer coma diameter: 5′, providing m=10.4 (TK). This outer coma is a remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Nov. 03.40 UT: m1=12.5, Dia.=2.1’, DC=2; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, weakly condensed opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 30.43 UT: m1=12.3, Dia.=2.2’, DC=3; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, close to stars, weakly condensed and opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 29.43 UT: m1=12.2, Dia.=2.8’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse coma with slightly brighter and weakly condensed centre, close to mag 10.5 star. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 27.42 UT: m1=12.2, Dia.=2.3’, DC=2/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight hint of brightening to centre but weakly condensed. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Oct. 20.10 UT: m1=10.0, Dia.=6′, DC=2/; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent outbursts. Faint and diffuse outer coma diameter: 6′, providing m=10.0 (TK). Altitude: 11 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Oct. 16.83 UT: m1=12.5, Dia.=2′, DC=2; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.65]
2018 Oct. 16.02 UT: m1=10.2, Dia.=6′, DC=2/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent outbursts. Brighter inner coma diameter: 3′, providing m=11.5 (AQ). Faint and diffuse outer coma diameter: 6′, providing m=10.2 (TK). Several stars inside the coma, the brightest being mag. 13.4 (AQ). Tycho-2 comparison stars. SQM: 21.2]
2018 Oct. 15.78 UT: m1=11.9, Dia.=2′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.19]
2018 Oct. 13.77 UT: m1=11.6, Dia.=1.7′, DC=3; 25.4-cm L f/5(104x); Maik Mayer (Limburg, Germany)
2018 Oct. 13.72 UT: m1=11.5, Dia.=1.4′, DC=3; 25-cm L F:5(70.5x, 150x); Danil Sidorko (Korenovsk, Russia)
2018 Oct. 11.74 UT: m1=12.0, Dia.=2′, DC=3; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.60]
2018 Oct. 11.72 UT: m1=11.6, Dia.=1.1′, DC=3; 25-cm L F:5(70.5x, 150x); Danil Sidorko (Korenovsk, Russia)
2018 Oct. 10.78 UT: m1=11.7:, Dia.=2′, DC=3; 25.4-cm L f/5 (104x); Maik Meyer (Limburg, Germany)
2018 Oct. 09.75 UT: m1=12.1, Dia.=1.5′, DC=2/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.60]
2018 Oct. 08.43 UT: m1=11.9, Dia.=2.7’, DC=4; 25-cm L f:5(39x); Chris Wyatt (Walcha, NSW, Australia) [Post outburst. Does not enhance in Swan Band filter. Coma circular, opaque centre, moderately condensed. Semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 07.75 UT: m1=11.5, Dia.=3′, DC=2; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.48]
2018 Oct. 07.44 UT: m1=12.2, Dia.=1.6′, DC=3; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.86 UT: m1=13.1 CCD, Dia.=0.59′, DC=5/; 0.25-m f/4.7 Newton + CCD; S. Shurpakov (Observatory C36, Belarus)
2018 Oct. 06.53 UT: m1=12.2, Dia.=1.6′, DC=5; 40.0-cm L f/4.5(75x); Seiichi Yoshida (Gunma, Japan)
2018 Oct. 05.80 UT: m1=11.5, Dia.=1.3′, DC=3; 25.4-cm L f/5 (104x); Maik Meyer (Limburg, Germany)
2018 Oct. 04.84 UT: m1=11.4, Dia.=2′, DC=4; 25.4-cm L (120x); Alexsandr Morozov (Novozybkov, Russia) [method S]
2018 Oct. 04.82 UT: m1=11.5, Dia.=1.3′, DC=3; 25.4-cm L f/5 (104x); Maik Meyer (Limburg, Germany)
2018 Oct. 03.87 UT: m1=10.3, Dia.=4′, DC=3; 20-cm SCT(100x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [In evolution after the recent outburst. Brighter inner coma diameter: 1.2′, providing m=11.4 (APASS). Faint and diffuse outer coma diameter: 4′, providing m=10.3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Oct. 01.76 UT: m1=11.7, Dia.=1.8′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Lm=6.63]
2018 Oct. 01.42 UT: m1=12.2, Dia.=1.6’, DC=5/; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Post outburst. Coma circular, semi-transparent outer coma. Opaque inner coma, faint stellaring visible in good seeing. No enhancement with Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 30.95 UT: m1=12.3, Dia.=1.2′, DC=6, no tail; 23.5-cm SCT(138x); Carlos Labordena (Castellón, España)
2018 Sep. 30.74 UT: m1=11.5, Dia.=1.5′, DC=4; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.51]
2018 Sep. 29.79 UT: m1=11.4, Dia.=1.6′, DC=3/; 25.4-cm L 5 104x); Maik Meyer (Limburg, Germany)
2018 Sep. 29.77 UT: m1=12.0, Dia.=1.2′, DC=3/; 25.4-cm L(120x); Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.47]
2018 Sep. 27.39 UT: m1=12.2, Dia.=1.7’, DC=5/; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Post outburst; Does not enhance in Swan Band filter, faintly stellar in good seeing, visible at x39 but better resolved at x83. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 23.18 UT: m=12.4, Dia.=0.3′, DC=8; 20-cm SCT(100x); Juan Jose Gonzalez ( Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In outburst. Brighter inner coma diameter : 0.3′, providing m=12.4 (APASS). Faint and diffuse outer coma diameter : 4′, providing m=10.5:(Tycho-2). This faint outer coma is a remnant of previous outbursts. In-focus method. SQM: 20.4]
2018 Sep. 19.05 UT: m=11.1:, Dia.=5′, DC=1; 20-cm SCT(77x); Juan Jose Gonzalez (Aralla, Leon, Spain; Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Faint and diffuse outer coma diameter : 5′, providing m=11.1: (TK). This faint outer coma is a remnant of previous outbursts. Sidgwick method. APASS comparison stars. SQM: 21.5]
2018 Sep. 18.72 UT: m1=[14.1, negative, Dia=–, DC=–; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible; Fainter than a 14.1 magnitude star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2018 Sep. 09.96 UT: m=10.8:, Dia.=6′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55′ N, 5º 50′ W) [Faint and diffuse outer coma diameter : 6′, providing m=10.8: (TK). This faint outer coma is a remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2018 Sep. 08.40 UT: m1=[14.3, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.3 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2018 Sep. 01.91 UT: m=10.8:, Dia.=5′, DC=1/; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Brighter inner coma magnitude was difficult to estimate due to close mag. 11.7 (APASS) star. Faint and diffuse outer coma diameter: 5′, providing m=10.8: (TK). This faint outer coma is a remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2018 Aug. 20.09 UT: m=10.7:, Dia.=5′, DC=1; 20-cm SCT(77x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent minor outburst. Brighter inner coma magnitude was difficult to estimate due to close mag. 11.7 (Tycho-2) star. Faint and diffuse outer coma diameter: 5′, providing m=10.7: (Tycho). This faint outer coma is a remnant of previous outbursts. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2018 Aug. 18.72 UT: m1=14.1, Dia.=0.8’, DC=2; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, difficult. Slightly brighter in centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 15.72 UT: m1=14.0, Dia.=0.9’, DC=2; 25-cm L f:5(83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 15.00 UT: m1=13.2, Dia.=0.9′, DC=5; 20-cm SCT(100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [In evolution after the recent minor outburst. Brighter inner coma diameter: 0.9′, providing m=13.2 (AQ). Faint and diffuse outer coma diameter: 3′.5, providing m=11.3: (AQ). This faint outer coma is a remnant of previous outbursts. Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 Aug. 08.73 UT: m1=14.1, Dia.=0.7’, DC=2/; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 08.12 UT: m1=13.5, Dia.=0.7′, DC=6; 20-cm SCT (100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Observed after the recent minor outburst. Wider faint outer coma (diameter 3′) remnant from previous outbursts. Field stars checked in DSS. Sidgwick method. APASS comparison stars. SQM: 21.4; 21.5 at zenith]
2018 Aug. 06.61 UT: m1=14.0, Dia.= 1’, DC=2/; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. No stellaring visible. Limiting magnitude= 15.0 (star in-focus). Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 July 23.76 UT: m1=[14.9, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0. Method= I. Cat= AQ]
2018 July 22.11 UT: m1=12.0, Dia.=2.5′, DC=1/; 20-cm SCT (77x); Juan Jose Gonzalez (Quintanilla de los Oteros, Leon, Spain. Alt. 860 m, 42º 19′ N, 5º 24′ W) [Field stars checked in DSS. Sidgwick method. APASScomparison stars. SQM: 21.4]
2018 July 20.74 UT: m1=[14.9, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0. Method= I. Cat: AQ]
2018 July 18.76 UT: m1=[14.9, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0. Method= I. Cat= AQ]
2018 July 18.06 UT: m1=12.3, Dia.=2.5′, DC=1/; 20-cm SCT (100x); Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [From dark mountain skies the comet shows a faint and very diffuse coma, remnant of previous outbursts. Field stars checked in DSS. Altitude: 38 deg. Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 July 16.74 UT: m1=[14.9, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 July 14.03 UT: m1=15.0, Dia.=0.7′, DC=0; 60-cm L (305x); Sandor Szabo (Sopron, Hungary)
2018 July 13.73 UT: m1=[14.9; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 July 13.71 UT: m1=[13.5; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Gunma, Japan)
2018 July 11.74 UT: m1=[14.2, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.2 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 July 09.63 UT: m1=[14.9; nmegative; 25-cm L f:5 (166x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 June 22.78 UT: m1=[15.1, negative; 25-cm L f:5 (166x); Chris Wyatt (Walcha, NSW, Australia) [Not visible; fainter than mag 15.1 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 June 13.77 UT: m1=[15.0, negative; 25-cm L f:5 (166x); Chris Wyatt (Walcha, NSW, Australia) [Not visible; fainter than mag 15.0 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 June 12.75 UT: m1=[15.0, negative; 25-cm L f:5 (166x); Chris Wyatt (Walcha, NSW, Australia) [Not visible; fainter than mag 15.0 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 June 11.70 UT: m1=[14.6, negative; 25-cm L f:5 (166x); Chris Wyatt (Walcha, NSW, Australia) [Not visible; fainter than mag 14.6 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 May  25.75 UT: m1=[14.5; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible. Fainter than magnitude 14.5 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 May  21.75 UT: m1=[15.0, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 15.0 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 May  19.75 UT: m1=[14.7, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.7 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]
2018 May  18.76 UT: m1=[14.6, negative; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.6 star in-focus. Comparison stars checked using APASS data in Guide 9.0; Method= I; Cat= AQ]

linea-separador2

Dto. Publicaciones SECCION COMETAS LIADA
“Desde 1958 – Semper Observandum”
comet.observations [AT] gmail.com / cometas.liada [AT] gmail.com / rastreadoresdecometas [AT] gmail.com /

Nota: [magnitud es una observación negativa de modo que el cometa se encuentra debajo de ese brillo con ese instrumento utilizado. >magnitud es usado cuando el cometa fue visto y el observador simplemente dice que era más débil que la magnitud dada.  magnitud: los dos puntos “:” indican quela magnitud no es muy exacta o hecha en pobres condiciones.  & Diámetros de coma y longitudes de cola aproximados.

Compilado de Observaciones en formato LIADA (Morris modificado)

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