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RECIENTES OBSERVACIONES VISUALES & CCD / RECENT COMET OBSERVATIONS
(actualizada al 27 de Septiembre de 2020 / Update 2020, September 27 – cometas.liada [AT] gmail.com)

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Coordinación: Vacante / Administration: Vacant


C/2020 Q1 (Borisov)
2020 Sep. 20.85 UT: m1=12.8, Dia=1.8′, DC=2, … 25.4-cm L(240x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Sep. 15.88 UT: m1=12.2, Dia.=1.5′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Sep. 12.86 UT: m1=12.4, Dia=2.5′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Sep. 12.02 UT: m1=11.3, Dia.=4′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Sep. 09.94 UT: m1=10.1, Dia.=7′, DC=2/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Observation made under better conditions, without moonlight interference, providing a much wider coma diameter and brighter m1 estimate in comparison with my previous Sep. 7.92 observation. Motion checked during a 60-min period. Nearby field stars checked in DSS. Altitude: 25 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 Sep. 07.92 UT: m1=10.8, Dia.=2.5′, DC=3, … 20-cm SCT(133x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Motion checked during a 30-min period. Nearby field stars checked in DSS. Altitude: 18 deg. Some moonlight interference. Sidgwick method. Tycho-2 comparison stars. SQM: 20.4]
2020 Aug. 29.97 UT: m1=12.9, Dia=1.5′, DC=2/, … 25.4-cm L(240x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 25.14 UT: m1=11.6, Dia.=2.5′, DC=2, … 20-cm SCT(160x) … Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain, 43º 10′ N, 5º 54′ W, alt. 1221 m) [Brighter than expected. Motion checked during a 45-min period. Nearby field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]

C/2020 M3 (ATLAS)
2020 Sep. 26.29 UT: m1=10.2, Dia.=4′, DC=2/, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Sep. 24.21 UT: m1=10.3, Dia.=3′, DC=2, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Sep 08.50 UT: m1=10.3, Dia.=6.8’, DC=2, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse round smudge. Altitude= 18.4°, enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 Aug. 26.75 UT: m1=14.5, Dia.=0.5’, DC=5, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Easy to see despite bright star to the NW. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

C/2020 K8 (Catalina-ATLAS)
2020 Aug. 25.18 UT: m1=10.3, Dia.=3′, DC=2/, … 20-cm SCT(160x) … Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain, 43º 10′ N, 5º 54′ W, alt. 1221 m) [Brighter than expected. Motion checked during a 30-min period. Nearby field stars checked in DSS. Altitude: 18 deg. Astronomical twilight. Mountain location, very clear sky down to the horizon. Sidgwick method. Tycho-2 comparison stars. SQM: 20.1. at 25.17 UT]
2020 Aug. 18.44 UT: m1=14.2, Dia.=0.8’, DC=2, … 41-cm L(229x) … Alan Hale (Cloudcroft, New Mexico, USA)

C/2020 H2 (Pruyne)
2020 Apr. 28.78 UT: m1=13.3, Dia.=0.7’, DC=3, … 25-cm L f:5(125x) … Chris Wyat (Walcha, NSW, Australia) [Coma very diffuse and difficult, previously designated PCCP C166T11. Altitude= 21.6°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

P/2020 G1 (Pimentel)
2020 Apr. 24.40 UT: m1=15.6, Dia.=0.2’, DC=3, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Difficult. very small and diffuse, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 19.40 UT: m1=15.0, Dia.=0.4’, DC=2/, … 40-cm L(261x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, visible in periods of good seeing. Altitude= 23.4°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

C/2020 F8 (SWAN)
2020 May  28.95 UT: m1=8.0:, Dia.=&6′, DC=2, … 20.0-cm L f/4(80x) … Alex Scholten (Eerbeek, Holand)
2020 May  27.91 UT: m1=6.9, Dia.=5′, DC=2, Tail=0.3 deg. in PA: 350 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto Ventana, Asturias, Spain, 43º 03′ N, 6º 00′ W, alt. 1580 m) [Elongated remnant-like morphology. Mag. 10.6 (GSC) star in coma. Observation made under better conditions, from a higher mountain location, than in my previous May 26.12 observation. End of astronomical twilight. Altitude: 8 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2020 May  27.91 UT: m1=8.0, Dia.=4′, DC=2, Tail=12′ in PA:340 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May  26.12 UT: m1=6.8, Dia.=4′, DC=3, Tail=0.2 deg. in PA: 350 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Renorios – Bello – Aller, Asturias, Spain, 43º 08′ N, 5º 38′ W, alt. 1200 m) [Beginning of astronomical twilight. Mountain location, very clear sky. Altitude: 7 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.1]
2020 May  20.95 UT: m1=7.1, Dia.=8′, DC=3, … 11.4-cm L(40x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May  18.13 UT: m1=5.7, Dia.=6′, DC=5/, Tail=0.2 deg. in PA: 270 deg., … 25×100 B … Juan Jose Gonzalez (Puerto de la Cubilla, Asturias, Spain, 42º 59′ N, 5º 54′ W, alt. 1680 m) [Mountain location, very clear sky. Altitude: 6°. Sidgwick method. Tycho-2 comparison stars. SQM: 20.4]
2020 May  18.13 UT: m1=5.8, Dia.=5′, DC=5, … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto de la Cubilla, Asturias, Spain, 42º 59′ N, 5º 54′ W, alt. 1680 m)
2020 May  12.36 UT: m1=5.8, Dia.=8′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight, comet altitude: 13°, atmospheric extinction applied]
2020 May  12.36 UT: m1=5.8, Dia.=8′, DC=6, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 May  12.35 UT: m1=5.7, Dia.=8′, DC=6, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  11.36 UT: m1=5.7, Dia.=7′, DC=7, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, nautical twilight, comet and comparison stars: 15° altitude]
2020 May  11.36 UT: m1=5.8, Dia.=8′, DC=6, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 May  11.35 UT: m1=5.8, Dia.=8′, DC=6, … 15×70 B … Willian Souza( Sao Paulo, Brazil)
2020 May  11.35 UT: m1=5.9, Dia.=7′, DC=6, … 11×80 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May 11.14 UT: m1=6.6, Dia.=6′, DC=4, no tail, … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 May  10.36 UT: m1=5.8, Dia.=8′, DC=6, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  10.35 UT: m1=5.8, Dia.=8′, DC=6, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 May  09.40 UT: m1=5.9, Dia.=2′, DC=2, Tail=<5 arcmin. in PA:250 deg., … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 May  09.35 UT: m1=5.6, Dia=6′, DC=5/, … 11×80 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  09.35 UT: m1=5.6, Dia.=8′, DC=6, … 7×50 B … Willian Souza (Sao Paulo, Brazil)
2020 May  09.35 UT: m1=5.7, Dia.=8′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 May  09.34 UT: m1=5.7, Dia.=8′, DC=6, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  08.40 UT: m1=5.8, Dia.=2′, DC=2, Tail=<5 arcmin. in PA:250 deg., … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 May  08.36 UT: m1=5.5, Dia.=6′, DC=6, … 11×80 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  08.35 UT: m1=5.5, Dia.=8′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 May  07.37 UT: m1=5.5, Dia.=12’, DC=4, … 10X50 B … Alberto Anunziato (Paraná, Argentina) [Mét. Sidgwick, Cat. Tycho II. I can’t see the tail]
2020 May  06.79 UT: m1=5.5, Dia.=5’, DC=6, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, 99% illuminated, 6.2° above Western horizon. Faint tail traceable to 40’ in length in P.A. 235° approximately. Coma diffuse and opaque with a faint stellar pseudo-nucleus. Localised fog conditions but clear in vicinity of comet. Comet altitude= 23.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  05.35 UT: m1=5.1, Dia.=10′, DC=6, Tail=60 arcmin. in PA: 240°, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Mist, comet is decreasing its brightness]
2020 May  05.35 UT: m1=5.2, Dia.=10′, DC=6, … 8×42 B … Willian Souza (Sao Paulo, Brazil)
2020 May  05.35 UT: m1=5.3, Dia.=8′, DC=5/, … 11×80 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  05.34 UT: m1=5.3, Dia.=10′, DC=6, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  04.79 UT: m1=5.7, Dia.=8.5’, DC=5/, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Faint tail traceable to 1° in length in P.A. 233° approximately using averted vision. Diffuse and opaque inner coma, pale aqua-blue colour. Faint stellar pseudo-nucleus visible. Next to Iota Ceti, 18’ away, Altitude= 25.0°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  04.77 UT: m1=5.3, Dia.=8′, DC=5, Tail=1.5 degrees in PA=225 degrees, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 May  04.36 UT: m1=5.0, Dia.=10′, DC=6/, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight]
2020 May  04.35 UT: m1=5.0, Dia.=10′, DC=7, … 8×42 B … Willian Souza (Sao Paulo, Brazil)
2020 May  04.35 UT: m1=5.1, Dia.=8′, DC=5, … 11×80 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  04.34 UT: m1=5.1, Dia.=10′, DC=7, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  04.34 UT: m1=5.1, Dia.=10′, DC=6, … 15-cm L(29x) … Willian Souza (Sao Paulo, Brazil)
2020 May  03.75 UT: m1=5.6, Dia.=9’, DC=7, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 1.8° in length in P.A. 230° approximately using averted vision. Coma opaque and aqua-blue in colour with faint thin transparent outer edge. Altitude= 17.2°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  03.35 UT: m1=5.0, Dia.=8′, DC=6, … 11×80 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  03.34 UT: m1=4.8, DC=8, … Naked eye … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  03.33 UT: m1=4.9, Dia.=10′, DC=6/, Tail=40 arcmin. in PA: 240°, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  02.33 UT: m1=5.1, Dia.=10′, DC=7, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  02.35 UT: m1=4.7, DC=8, … Naked eye … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  02.35 UT: m1=5.0, Dia.=8′, DC=5, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 May  02.34 UT: m1=4.8, Dia.=10′, DC=6/, Tail=40 arcmin. in PA: 230°, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  01.40 UT: m1=5.5, Dia.=2′, DC=2, Tail=<3 arcmin. in PA:240 deg., … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 May  01.37 UT: m1=5.5, … 9.0-cm T(24x) … Igor Grageda Mendez (Cochabamba, Bolivia)
2020 May  01.37 UT: m1=5.5, … 15×70 B … Igor Grageda Mendez (Cochabamba, Bolivia)
2020 May  01.35 UT: m1=4.8, DC=8, … Naked eye … Marco Antonio Coelho Goiato (Araçatuba, Brazil) …
2020 May  01.35 UT: m=5.1, Dia.=10′, DC=6, … 8×42 B … Willian Souza (Sao Paulo, Brazil)
2020 May  01.34 UT: m1=4.9, Dia.=10′, DC=6/, Tail=40 arcmin. in PA: 230°, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  01.34 UT: m1=5.1, Dia.=8′, DC=6, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 May  01.34 UT: m=5.2, Dia.=10′, DC=7, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 May  01.32 UT: m=5.2, Dia.=10′, DC=7, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 May  01.31 UT: m=5.2, Dia.=10′, DC=6, … 15-cm L(32x) … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 30.40 UT: m1=5.7, Dia.=1′, DC=1, Tail=<3 arcmin. in PA:240 deg., … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 Apr. 30.37 UT: m1=5.7, … 9.0-cm T(100x) … Igor Grageda Mendez (Cochabamba, Bolivia)
2020 Apr. 30.37 UT: m1=5.7, … 9.0-cm T(24x) … Igor Grageda Mendez (Cochabamba, Bolivia)
2020 Apr. 30.37 UT: m1=5.7, … 15×70 B … Igor Grageda Mendez (Cochabamba, Bolivia)
2020 Apr. 30.35 UT: m1=5.2, Dia.=8′, DC=5/, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 30.32 UT: m1=5.2, Dia.=10′, DC=7, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 30.35 UT: m1=5.1, Dia.=10′, DC=7, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 29.75 UT: m1=5.4, Dia.=8.5’, DC=6, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 45’ in length in P.A. 223° approximately. Coma centre opaque, stellar pseudo-nucleus, thin transparent outer coma edge. Visible naked eye, estimated magnitude 5.2. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 29.35 UT: m1=5.3, Dia.=8′, DC=6, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 29.35 UT: m1=5.4, Dia.=6′, DC=5, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 29.35 UT: m1=5.2, Dia.=10′, DC=7, … 8×42 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 29.35 UT: m1=5.3, Dia.=10′, DC=7, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 29.34 UT: m1=5.3, Dia.=10′, DC=7, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 29.33 UT: m1=5.3, Dia.=10′, DC=6, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 29.31 UT: m1=5.6, Dia.=9′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 28.76 UT: m1=5.6, Dia.=7’, DC=5/, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Pale aqua-blue coma, centre opaque, hazy edges with faint tail visible, traced to 35’ in length in P.A. 223° approximately. Through the 10” f/5 dob at x40 I can trace the faint and narrow tail for 1.2° in P.A. 226°. Faintly detectable with naked eye using averted vision. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 28.40 UT: m1=6.3, Dia.=1′, DC=1, Tail=<1 arcmin. in PA:240 deg., … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 Apr. 28.35 UT: m1=6.0, Dia.=10’, DC=5/, … 25-cm L(52X) … Gonzalo Vargas (Cochabamba Bolivia) [Some elongate coma or deformation around 220°aprox.]
2020 Apr. 28.35 UT: m1=6.1, Dia.=6′, DC=5, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 28.31 UT: m1=5.9, Dia.=9′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 27.40 UT: m1=6.5, Dia.=1′, DC=1, … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 Apr. 27.35 UT: m1=6.3, Dia.=8′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 27.35 UT: m1=6.4, Dia=6′, DC=4, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 26.35 UT: m1=6.6, Dia.=8′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 26.35 UT: m1=6.9, Dia.=6′, DC=5, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 26.34 UT: m1=6.7, Dia.=7′, DC=6/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 26.34 UT: m1=6.9, Dia.=6′, DC=5, … 10×50 B … Willian Souza ( Sao Paulo, Brazil)
2020 Apr. 26.32 UT: m1=6.9, Dia.=6′, DC=5, … 15×70 B … Willian Souza ( Sao Paulo, Brazil)
2020 Apr. 26.31 UT: m1=6.9, Dia.=6′, DC=5, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 25.75 UT: m1=7.2, Dia.=10’, DC=5, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with transparent outer edge, inner coma opaque and almost appears stellar. No tail visible. Through my 10” dob at x40 there is a faint narrow extension from the inner coma to the NNW approximately about 1.5’ in length from the centre, P.A. 353° approx. A faint tail is traced for 22’ in length in P.A. 220° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 25.40 UT: m1=7.2, Dia.=1′, DC=1, … 20×80 B … Germán Morales (Cochabamba, Bolivia)
2020 Apr. 25.35 UT: m1=7.0, Dia.=5′, DC=5, … 15×70 B … Willian Souza( Sao Paulo, Brazil)
2020 Apr. 25.33 UT: m1=6.8, Dia.=5′, DC=4/, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 25.31 UT: m1=7.0, Dia.=6′, DC=5, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 24.75 UT: m1=7.3, Dia.=9’, DC=5, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse and opaque, almost stellar at centre. Through the 10” f/5 reflector at x40 there is a faint tail traceable to 21’ in length in P.A. 219° approximately, and about 4’ wide at its extremity. No obvious tail sighted using 10×50 monocular used for m1 measurement. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 24.36 UT: m1=7.0, Dia.=5′, DC=4, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 24.33 UT: m1=7.1, Dia.=5′, DC=5, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 23.36 UT: m1=7.1, Dia.=4′, DC=4, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 23.34 UT: m1=7.4, Dia.=6′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 23.33 UT: m1=7.2, Dia.=5′, DC=5, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 22.76 UT: m1=7.7, Dia.=10’, DC=5, … 7×50 B … Chris Wyatt (Walcha, NSW, Australia) [Well condensed and opaque centre, fading gradually to edges, no tail visible. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 22.76 UT: m1=7.7, Dia.=5.5’, DC=5/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 14.5’ in length in P.A. 216° approximately. Pale-aqua blue in colour, opaque centre gradually fading to edges. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 22.33 UT: m1=7.3, Dia.=5′, DC=4/, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 21.79 UT: m1=7.6, Dia.=9’, DC=5, … 5-cm R(10x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse and opaque with semi-transparent edge. Well condensed centre. No tail visible. Observed using 10×50 monocular. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 21.72 UT: m1=7.6, Dia.=5, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Enhanced through Swan Band filter]
2020 Apr. 21.35 UT: m1=7.2, Dia.=5′, DC=4, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 21.35 UT: m1=7.2, Dia.=5′, DC=4, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 21.34 UT: m1=7.3, Dia.=5′, DC=4, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 Apr. 21.33 UT, m1=7.3, Dia.=5′, DC=5, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 21.32 UT: m1=7.3, Dia.=5′, DC=5, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 21.30 UT: m1=7.3, Dia.=5′, DC=5, … 15-cm L(33x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 20.35 UT: m1=7.3, Dia.=5′, DC=4, … 15×70 B … Willian Souza( Sao Paulo, Brazil)
2020 Apr. 20.35 UT: m1=7.4, Dia.=7′, DC=4, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 20.34 UT: m1=7.5, Dia.=6′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 20.33 UT: m1=7.4, Dia.=4′, DC=5, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 20.33 UT: m1=7.6, Dia.=5′, DC=5, … 15-cm L(42x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 20.30 UT: m1=7.6, Dia.=5′, DC=5, … 15-cm L(33x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 19.34 UT: m1=7.5:, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 18.71 UT: m1=8.1, Dia.=4.5’, DC=5, … 25-cm L(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Enhances strongly in Swan Band filter. Coma elongated to the SW, faint tail visible at x74, traced to 18’ in length in P.A. 220°. Opaque inner coma fading to semi-transparent outer coma, pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 18.34 UT: m1=7.6, Dia.=4′, DC=5, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 18.34 UT: m1=7.8, Dia.=4′, DC=5, … 15-cm L(50x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 18.33 UT: m1=7.8, Dia.=5′, DC=5, … 15-cm L(33x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 17.34 UT: m1=7.7, Dia.=3′, DC=4, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 17.34 UT: m1=7.9, Dia.=4′, DC=4, … 15-cm L(50x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 17.31 UT: m1=7.9, Dia.=5′, DC=4, … 15-cm L(30x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 Apr. 16.37 UT: m1=7.6, Dia.=7.0’, DC=3/, … 25-cm L(52x) … Gonzalo Vargas (Cochabamba, Bolivia) [Some Moon light interference, coma appear dense but there is no a remarkable central zone, using pollution filter green color is clear]
2020 Apr. 16.34 UT: m1=7.7, Dia.=6′, DC=4, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Apr. 16.33 UT: m1=7.8, Dia.=5′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Apr. 14.34 UT: m1=7.8, Dia.=3′, DC=3, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 13.34 UT: m1=7.8, Dia.=3′, DC=3/, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 12.75 UT: m1=7.9, Dia.=3.7’, DC=5/, … 25-cm L(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight … Appears faintly stellar in good seeing. Well condensed opaque inner coma, gradually fading to semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 12.35 UT: m1=8.1, Dia.=3′, DC=4, … 11×80 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 12.34 UT: m1=7.9, Dia.=3′, DC=3/, … 25×100 B … Jose Guilherme Aguiar (Campinas/SP, Brazil)
2020 Apr. 11.79 UT: m1=7.8, Dia.=4’, DC=5, … 15×70 B … Michael Mattiazzo (Swan Hill, Australia)
2020 Apr. 11.73 UT: m1=8.0, Dia.=4’, DC=5, … 25-cm L(40x) … Chris Wyatt (Walcha, NSW, Australia) [Enhances strongly in Swan Band filter. Faint transparent outer coma, gradually brightening to an opaque inner coma with compact centre, not stellar. Visible in 7×50 B’s as a faint smudge. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]

C/2020 F5 (MASTER)
2020 Aug. 26.73 UT: m1=15.1, Dia.=0.3’, DC=4/, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse outer coma, opaque centre. Altitude= 18.9°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Apr. 22.44 UT: m1=15.4, Dia.=0.3’, DC=3/, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to mag 11.4 star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

C/2020 F3 (NEOWISE)
2020 Sep. 11.83 UT: m1=9.2, Dia.=3′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Sep. 08.41 UT: m1=9.0, Dia.=7’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia] [Faint tail traceable to 36’ in length in P.A. 059 deg. approximately. Diffuse coma, small opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Sep. 07.86 UT: m1=8.9, 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) [Altitude: 9 deg. Mag. 7.7 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2020 Sep. 07.42 UT: m1=9.0:, … 15×80 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 Sep. 06.94 UT: m1=9.5, Dia.=3′, DC=2/, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Sep. 06.41 UT: m1=9.0:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 Sep. 05.84 UT: m1=8.7, Dia.=3′, DC=3, … 20-cm SCT(57x) … Carlos Labordena (Castellón, España)
2020 Aug. 24.89 UT: m1=7.9, Dia.=5′, DC=4, … 20-cm SCT(77x) … Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain, 43º 10′ N, 5º 54′ W, alt. 1221 m) [Altitude: 13 deg. Some moonlight interference. Sidgwick method. Tycho-2 comparison stars. SQM: 20.1]
2020 Aug. 24.38 UT: m1=8.0, Dia.=8’, DC=4, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Diffuse, moderately condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Aug. 23.93 UT: m1=8.1, Dia.=5′, DC=4, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Aug. 22.97 UT: m1=8.1, Dia.=5′, DC=4/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Aug. 22.78 UT: m1=7.8, Dia.=7′, DC=4, … 6-cm B(20x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 19.87 UT: m1=7.8, Dia.=4′, DC=3, Tail=30 arcmin., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 Aug. 19.80 UT: m1=7.4, Dia.=4′, DC=3, … 15×70 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 Aug. 17.84 UT: m1=7.5, Dia.=5′, DC=2, … 15×70 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 Aug. 16.80 UT: m1=7.3, Dia.=8′, DC=5/, Tail=15 arcmin. in PA=70 deg., … 6-cm B(20x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 15.87 UT: m1=7.1, Dia.=6′, DC=5, … 8cm-B(20x) … Valentín Díaz (La Romaneta, Alicante, España)
2020 Aug. 15.87 UT: m1=7.3, Dia.=5′, DC=4, Tail=1 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 Aug. 15.86 UT: m1=6.7, Dia.=3′, DC=3, … 15×70 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 Aug. 14.80 UT: m1=6.9, Dia.=7′, DC=6, Tail=15 arcmin. in PA=60 deg., … 6-cm B(20x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 13.91 UT: m1=7.1, Dia.=7′, DC=6, Tail=1.2 deg., … 10x50B … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Dust fanned tail spanning from 40 deg. to 100 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 Aug. 13.37 UT: m1=6.6, Dia.=8′, DC=5, Tail=2 deg. in PA=80 deg., … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 Aug. 10.95 UT: m1=6.4, Dia.=4′, DC=4, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 10.84 UT: m1=6.6, Dia.=8′, DC=5/, … 5-cm B(8x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 09.92 UT: m1=6.2, Dia.=5′, DC=4, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 09.87 UT: m1=6.3, Dia.=6′, DC=4, Tail=1.2 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 Aug. 09.86 UT: m1=5.8, Dia.=3′, DC=4, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 Aug. 08.94 UT: m1=6.2, Dia.=5′, DC=4, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 08.93 UT: m1=6.3, Dia.=4′, DC=5, Tail=1 deg. in PA:95 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 08.83 UT: m1=5.6, Dia.=3′, DC=4, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 Aug. 07.94 UT: m1=6.1, Dia.=5′, DC=4/, …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 07.92 UT: m1=6.6, Dia.=5′, DC=4, … 15×70 B … Willian Souza (Sao Paulo-SP, Brazil)
2020 Aug. 07.86 UT: m1=5.8, Dia.=8′, DC=6, Tail=1.2 deg. in PA=72 deg., … 5-cm B(10x) … Valentín Díaz (La Romaneta, Alicante, España)
2020 Aug. 07.84 UT: m1=6.7, Dia.=8′, DC=5, … 8×56 B … Marian Legutko (Gliwice, Poland)
2020 Aug. 06.92 UT: m1=6.0, Dia.=5′, DC=4/, …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 06.92 UT: m1=6.3, Dia.=5′, DC=3, … 15×70 B …. Willian Souza (Sao Paulo-SP, Brazil)
2020 Aug. 06.88 UT: m1=6.2, Dia.=6′, DC=5, Tail=50 arcmin., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 Aug. 06.81 UT: m1=6.2, Dia=6′, DC=6, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 05.92 UT: m1=6.0, Dia.=5′, DC=4, … 15×70 B …. Willian Souza (Sao Paulo-SP, Brazil)
2020 Aug. 05.83 UT: m1=5.8, Dia.=4′, DC=6, … 20×60 B … Marian Legutko (Gliwice, Poland)
2020 Aug. 05.37 UT: m1=5.3, Tail=1.7 deg. PA=80 deg., … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Glimpsed with naked eye. Slightly enhanced using Swan Band filter. Tail appeared broad]
2020 Aug. 05.35 UT: m1=5.9, Dia.=9’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Twilight, Faint and broad fanning tail visible, traced to 1° in length in P.A. 088° approximately and curving to the NE. Semi-transparent outer coma, opaque inner coma, aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Aug. 04.92 UT: m1=5.8, Dia.=5′, DC=4/, …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 04.91 UT: m1=5.8, Dia.=5′, DC=5, … 15×70 B …. Willian Souza (Sao Paulo-SP, Brazil)
2020 Aug. 04.91 UT: m1=5.9, Dia.=4′, DC=5/, Tail=1° in PA:95 deg., …. 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 03.93 UT: m1=5.7, Dia.=4′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Aug. 03.92 UT: m1=5.5, Dia.=5′, DC=5, … 15×70 B … Willian Souza (Sao Paulo-SP, Brazil)
2020 Aug. 02.94 UT: m1=5.6, Dia.=5′, DC=4/, …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Aug. 02.93 UT: m1=5.7, Dia.=4′, DC=6/, Tail=1 deg. in PA:90 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Aug. 02.35 UT: m1=5.1, Dia.=6.5’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Bright moonlight, 12.7 day old, 98.4% illuminated. Faint tail visible, traced to 30’ in length in P.A. 084° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Aug. 02.01 UT: m1=5.6, Dia.=5′, DC=5, Tail=30 arcmin. in PA:80 deg., … 20×80 B … Roger Jiménez (Barquisimeto, Lara, Venezuela, 10º 04′ N 69º 19′ W, 606 msnm) [Moonlight, light polution. Altitude: 36 deg. Morris method. Tycho-2 comparison stars]
2020 Aug. 01.95 UT: m1=5.5, Dia.=4′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 Aug. 01.90 UT: m1=5.6, Dia.=4′, DC=5, Tail=1 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 Aug. 01.68 UT: m1=5.2, Dia.=7’, DC=5, … 10.2-cm R(40x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [Moon 95%, method S, lm=4.2]
2020 Aug. 01.83 UT: m1=5.6, Dia=7′, DC=6, Tail=0.3 deg. in PA=70 deg., … 6-cm B(20x) … Alexsandr Morozov (Novozybkov, Russia) [Moon 96%]
2020 Aug. 01.01 UT: m1=5.3, Dia.=6′, DC=5, Tail=40 arcmin. in PA:80 deg., … 20×80 B … Roger Jiménez (Barquisimeto, Lara, Venezuela, 10º 04′ N 69º 19′ W, 606 msnm) [Moonlight, Altitude: 35 deg. Morris method. Tycho-2 comparison stars]
2020 July 31.93 UT: m1=5.3, Dia.=5′, DC=5, Tail=20 arcmin. in PA:90 deg., … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 July 31.01 UT: m1=4.9, Dia.=6′, DC=5, Tail=17 arcmin. in PA:78deg., … 20×80 B … Roger Jiménez (Barquisimeto, Lara, Venezuela, 10º 04′ N 69º 19′ W, 606 msnm) [Moonlight. Altitude: 33 deg. Morris method. Tycho-2 comparison stars]
2020 July 30.93 UT: m1=5.1, Dia.=5′, DC=6, Tail=30 arcmin. in PA:90 deg., … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, clouds]
2020 July 30.81 UT: m1=5.8, Dia=7′, DC=6/, Tail=0.4 deg. in PA=70 deg., … 6-cm B(20x) … Alexsandr Morozov (Novozybkov, Russia) (Moon 84%)
2020 July 30.36 UT: m1=4.8, Tail=1 deg. in PA=100 deg., … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Tail difficult in moonlight, but may have been quite broad. Coma enhanced through Swan Band filter]
2020 July 30.34 UT: m1=5.2, Dia.=8’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Faint tail visible, traced to 45’ in length in P.A. 080° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 29.99 UT: m1=5.8, Dia.=7′, DC=6/, Tail=120 arcmin. in PA:68 deg., … 8.0-cm L(30X) … Gonzalo Vargas (Cochabamba, Bolivia) [Moon light, high mountain observation place]
2020 July 29.84 UT: m1=4.9, Dia.=5′, DC=7, Tail=0.5 deg. in PA:83 deg., … 7×50 B … Marian Legutko (Gliwice, Poland)
2020 July 29.36 UT: m1=4.6:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Tail of approx 1 degree faintly visible in bright moonlight]
2020 July 28.94 UT: m1=4.7*, Dia.=6′, DC=6/, Tail=2 deg. in PA:80 deg., …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, comet altitude: 16°, atmospheric extinction applied]
2020 July 28.93 UT: m1=4.8*, Dia.=5′, DC=7, Tail=1.5 deg. in PA:80 deg., …. 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, comet altitude: 17°, atmospheric extinction applied]
2020 July 28.90 UT: m1=4.8, Dia.=5′, DC=7, … 10×50 B … Willian Souza (Sao Paulo-SP, Brazil)
2020 July 27.93 UT: m1=4.5*, Dia.=6′, DC=6/, Tail=3 deg. in PA:80 deg., …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, comet altitude: 15°, atmospheric extinction applied]
2020 July 27.92 UT: m1=4.6*, Dia.=5′, DC=7, Tail=2 deg. in PA:80 deg., …. 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, moonlight, comet altitude: 17°, atmospheric extinction applied]
2020 July 27.91 UT: m1=4.5*, Dia.=4′, DC=7, Tail=0.5 deg., … 9.0-cm R f/5.5(25x) … Willian Souza… (Sao Paulo-SP, Brazil);
2020 July 27.90 UT: m1=4.5*, Dia.=4′, DC=7, … 10×50 B … Willian Souza (Sao Paulo-SP, Brazil)
2020 July 27.89 UT: m1=4.5*, Dia.=4′, DC=7, … 9.0-cm R f/5.5(25x) … Willian Souza (Sao Paulo-SP, Brazil)
2020 July 27.007 UT: m1=4.4, Dia.=4′, DC=5, Tail=15 arcmin., … 20×80 B … Roger Jiménez (Barquisimeto, Lara, Venezuela, 10º 04′ N 69º 19′ W, 606 msnm) [Moonlight, Thin clouds. Altitude: 27 deg. Morris method. Tycho-2 comparison stars]
2020 July 26.93 UT: m1=4.3*, Dia.=5′, DC=6, Tail=2 deg. in PA:75 deg., …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, comet altitude: 12°, atmospheric extinction applied]
2020 July 26.925 UT: m1=[5.0, …. 20×50 B … Luis Mansilla (Rosario, Argentina) [Moonlight, comet altitude: 8°, Comp. star: 55 UMa % 57 UMa, haze and smoke]
2020 July 26.92 UT: m1=4.4*, Dia.=4′, DC=7, Tail=1.5 deg. in PA:75 deg., …. 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, moonlight, comet altitude: 14°, atmospheric extinction applied]
2020 July 26.88 UT: m1=4.6, Dia.=2′, DC=6, Tail=3 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 25.91 UT: m1=4.2*, Dia.=5′, DC=7, Tail=1.5 deg., … 15×70 B … Willian Souza (Mairipora-SP, Brazil)
2020 July 25.91 UT: m1=4.4*, Dia.=4′, DC=7, Tail=1.5 deg. in PA:70 deg., …. 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, thin clouds, light polution, moonlight, comet altitude: 12°, atmospheric extinction applied]
2020 July 25.91 UT: m1=4.2*, Dia.=5′, DC=7, Tail=1.5 deg., … 15×70 B … Willian Souza (Mairipora-SP, Brazil)
2020 July 25.90 UT: m1=4.3*, Dia.=5′, DC=7, Tail=1.2 deg., 15×70 B … Willian Souza (Mairipora-SP, Brazil)
2020 July 25.89 UT: m1=4.2*, Dia.=5′, DC=7/, … 15×70 B … Willian Souza (Mairipora-SP, Brazil)
2020 July 25.88 UT: m1=4.2, Dia.=6′, DC=7, Tail=1.5 deg. in PA=64 deg., … 15×65 B … Valentín Díaz (Elche capital, Alicante, España)
2020 July 25.87 UT: m1=4.0, Dia.=–, DC=7/, … 5×25 B … Valentín Díaz (Elche capital, Alicante, España)
2020 July 25.53 UT: m1=4.5 DC=6/, Tail=2 deg. in PA=65 deg., … 8×42 B … Man-To Hui (Pubei, Guangxi, China) [city light, moonlight, cirrus]
2020 July 24.96 UT: m1=4.3, Dia.=6′, DC=8/, Tail=9 deg. in PA:60 deg.,… 10x50B … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Naked eye: dust tail 13-deg. Altitude: 13 deg. Morris method. Tycho-2 comparison stars. SQM: 21.4 near comet]
2020 July 24.92 UT: m1=3.9*, Dia.=5′, DC=7… Tail=4 deg. in PA: 65 deg., …. 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, comet altitude: 8°, atmospheric extinction applied]
2020 July 24.92 UT: m1=4.0*, Dia.=4′, DC=7… Tail: 2° in PA 65° …. 20 x 100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, comet altitude: 7°, atmospheric extinction applied]
2020 July 24.90 UT: m1=3.9*, Dia.=4′, DC=8, Tail=2.5 deg., … 15×70 B …. Willian Souza (Sao Paulo-SP, Brazil)
2020 July 24.89 UT: m1=4.0*, Dia.=4′, DC=8, … 15×70 B … Willian Souza (Sao Paulo-SP, Brazil)
2020 July 24.88 UT: m1=3.9, Dia.=1.5′, DC=7, Tail=6 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 24.87 UT: m1=4.5, Dia.=3′, DC=6, Tail=1 deg. in PA: 60deg., … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 July 24.87 UT: m1=4.5, Dia.=10′, DC=7/, Tail=2.5 deg. in PA=55 deg., … 5-cm B(10x) … Alexsandr Morozov (Novozybkov, Russia)
2020 July 24.53 UT: m1=4.1 DC=7, Tail=3 deg. in PA=63 deg., … 8×42 B … Man-To Hui (Pubei, Guangxi, China) [city light, moonlight, slight thin cirrus]
2020 July 23.91 UT: m1=4.3*, Dia.=4′, DC=7, Tail=1 deg. in PA:60 deg., …. 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Civil twilight, comet altitude: 7°, atmospheric extinction applied]
2020 July 23.87 UT: m1=3.8, Dia.=8′, DC=8, Tail=1.5 deg. in PA=56 deg., … 5×25 B … Valentín Díaz (Elche capital, Alicante, España)
2020 July 23.87 UT: m1=4.6, Dia.=2′, DC=6/, Tail=1º in PA:50 deg., … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 July 22.86 UT: m1=3.1, Dia.=8′, DC=8, Tail=2.7 deg. in PA:55 deg., … 7×50 B … Marian Legutko (Gliwice, Poland) [Observation in mountain location]
2020 July 22.86 UT: m1=4.0, Dia=~, DC=7, Tail=4 deg. in PA=50 deg., … naked eye … Alexsandr Morozov (Novozybkov, Russia)
2020 July 23.86 UT: m1=4.1, Dia.=6′, DC=7, Tail=2 deg. in PA=56 deg., … 15×65 B … Valentín Díaz (Elche capital, Alicante, España)
2020 July 23.53 UT: m1=4.1, DC=7, Tail=2 deg. in PA=60 deg., … 8×42 B … Man-To Hui (Pubei, Guangxi, China) [city light, moonlight]
2020 July 22.89 UT: m1=3.7, Dia.=1′, DC=7, Tail=7 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 22.86 UT: m1=3.1, Dia.=8′, DC=8, Tail=2.7 deg. in PA:55 deg., … 7×50 B … Marian Legutko (Gliwice, Poland) [Observation in mountain location]
2020 July 22.69 UT: m1=3.6, Dia.=9.1’, DC=6, Tail=1.5 deg., … 10.2-cm R(40x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [method S, lm=4.3]
2020 July 21.87 UT: m1=4.6, Dia.=2′, DC=7/, Tail=1 deg. in PA:30 deg., … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 July 21.86 UT: m1=3.1, Dia.=8′, DC=7, Tail=3.5 deg. in PA:60 deg., … 7×50 B … Marian Legutko (Gliwice, Poland) [Observation in mountain location]
2020 July 21.71 UT: m1=3.2, Dia.=~, DC=7, Tail=0.5 deg., … naked eye … Andrey Semenyuta (Pavlodar, Kazakhstan) [clouds, lm=4.5]
2020 July 20.94 UT: m1=3.6, Dia.=~, DC=8, Tail=5 deg. in PA=25 deg., … naked eye … Alexsandr Morozov (Novozybkov, Russia)
2020 July 20.91 UT: m1=3.5, Dia.=–, DC=8/, Tail=12 deg. in PA:30 deg., … naked eye … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Naked eye: dust tail 12-deg in p.a. 30 deg. In 10x50B: Ion tail: 10 deg in p.a. 40 deg. Altitude: 18 deg. Mountain location, very clear sky. In-focus method. Tycho-2 comparison stars. Astronomical twilight. SQM: 21.3 near comet]
2020 July 20.86 UT: m1=4.6, Dia.=2′, DC=6, Tail= 1.5 deg. in PA: 20 deg., … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 July 19.85 UT: m1=3.7, Dia.=2′, DC=7, Tail= 1.5 deg. in PA: 15 deg., … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 July 19.48 UT: m1=3.3:, Dia.=-, DC=8, … 6.6-cm R(10x) … Seiichi Yoshida (Kanagawa, Japan)
2020 July 18.87 UT: m1=2.8, Dia.=1.2′, DC=8, Tail=12 deg., … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 18.87 UT: m1=4.0, Dia.=3′, DC=8, Tail=6 deg. in PA=7 deg., Tail 2=8 deg. in PA=28 deg., … 20×80 B & 5×25 B … Valentín Díaz (Sierra de la Pila, Murcia, España)
2020 July 18.86 UT: m1=3.2, Dia.=~, DC=7/, Tail=6 deg. in PA=15 deg., … naked eye … Alexsandr Morozov (Novozybkov, Russia)
2020 July 17.91 UT: m1=2.5:, Dia.=–, DC=8/, Tail= 15 deg. in PA 10 deg.,… naked eye … Juan Jose Gonzalez ( Cobertoria – Bildeo, Asturias, Spain; Alt. 1220 m, 43º 08′ N, 5º 54′ W) [Naked eye: dust tail 15-deg in p.a. 10 deg. In 10x50B: Ion tail: 8 deg in p.a. 20 deg. Altitude: 14 deg. Astronomical twilight. Mountain location, very clear sky. In-focus method. Tycho-2 comparison stars. Astronomical twilight. SQM: 20.3 near comet]
2020 July 16.91 UT: m1=2.3:*, Dia.=–, DC=8/, Tail=17 deg. in PA:0 deg., … naked eye … Juan Jose Gonzalez (Cueto Rosales, Leon, Spain. Alt. 1550 m, 42º 46′ N, 6º 03′ W) [Naked eye: dust tail 17-deg in p.a. 0 deg. In 10x50B: Ion tail: 8 deg in p.a. 10 deg. Magnitude estimate corrected for atmospheric extinction with ICQ average table. Low altitude: 11 deg. Astronomical twilight. Mountain location, very clear sky. In-focus method. Tycho-2 comparison stars. Astronomical twilight. SQM: 20.8 near comet]
2020 July 16.86 UT: m1=3.0, Dia.=~, DC=8, Tail=6 deg. in PA=350 deg., … naked eyes … Alexsandr Morozov (Novozybkov, Russia)
2020 July 16.53 UT: m1=2.8, DC=s8, Tail=3 deg. in PA: 0 deg., … naked eye … M.-T. Hui (Mulan, Heilongjiang, China) [city light, haze and light fog]
2020 July 15.88 UT: m1=2.0, Dia.=1′, DC=8, Tail=10 deg., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 14.87 UT: m1=2.0, Dia.=1′, DC=8, Tail=6 deg., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 14.14 UT: m1=1.9, Dia.=1′, DC=8, Tail=4 deg., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 13.85 UT: m1=2.5, Dia.=4′, DC=8, Tail=1.5 deg. in PA: 345 deg., … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain)
2020 July 13.74 UT: m1=1.7, DC=s9, Tail=15 deg. in PA:340 deg., … naked eye … M.-T. Hui (Shangzhi, Heilongjiang, China) [twilight and moonlight]
2020 July 13.13 UT: m1=1.8:, Dia.=–, DC=8/, Tail=12 deg. in PA: 340 deg., … naked eye … Juan Jose Gonzalez (Alto de la Camperona, Leon, Spain. Alt. 1600 m, 42º 51′ N, 5º 12′ W) [Low altitude: 7 deg. Mountain location, very clear sky. In-focus method. Tycho-2 comparison stars. Astronomical twilight. Moon phase 0.49. SQM: 20.3]
2020 July 12.76 UT: m1=1.7:*, DC=s9, Tail=10 deg. in PA:340 deg., … naked eye … M.-T. Hui (Shangzhi (Heilongjiang, China) [twilight and moonlight]
2020 July 11.95 UT: m1=2.3, Dia=~, DC=8, Tail=3 deg in PA=325 deg., … naked eye … Alexsandr Morozov (Novozybkov, Russia)
2020 July 11.15 UT: m1:1.7*, Dia.=2′, DC=8, Tail=2 deg. in PA:330 deg., … 5×25 B … Valentín Díaz (Elche capital, Alicante, España) [Estimation corrected for atmosferic extinction]
2020 July 11.14 UT: m1=1.8, Dia.=1′, DC=8, Tail=7 deg., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 11.00 UT: m1=1.2, Dia.=5′, DC=8, Tail=~4 deg. in PA: 325 deg., … 15×70 … Danil Sidorko (Korenovsk, Russia)
2020 July 10.74 UT: m1=1.1:*, DC=s9, Tail=6 deg. in PA:320 deg., … naked eye .. M.-T. Hui (Tangwang, Heilongjiang, China) [twilight and moonlight]
2020 July 09.92 UT: m1=2.5, Dia.=~, DC=9, Tail=2.5 deg. in PA=315 deg., … naked eyes … Alexsandr Morozov (Novozybkov, Russia)
2020 July 08.15 UT: m1=2.5:*, Dia.=1′, DC=8, Tail=2.5 deg. in PA: 310 deg., … 10x50B … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Magnitude estimate corrected for atmospheric extinction with ICQ average table. Low altitude: 9 deg. Strongly condensed. Beginning of nautical twilight. Moon phase 0.90. Mountain location, clear sky. In-focus method. Tycho-2 comparison stars. SQM: 17.7]
2020 July 07.13 UT: m1=1.4, Dia.=2′, DC=8, Tail=3.1 deg., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 06.96 UT: m1=1.7, Dia.=4′, DC=8, Tail=25 arcomin. in PA=310 deg., … 6-cm B(20x) … Alexsandr Morozov (Novozybkov, Russia)
2020 July 06.15 UT: m1=1.0, Dia.=0.7′, DC=8, Tail=1 deg., in PA:306 deg., … 2.5-cm B(5x) … Valentín Díaz (Elche capital, Alicante, España)
2020 July 06.13 UT: m1=1.3, Dia.=2′, DC=8, Tail=1.5 deg., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 05.99 UT: m1=1.8, Dia.=1′, DC=8, Tail=6’in PA=300 deg., … 6-cm B(20x) … Alexsandr Morozov (Novozybkov)
2020 July 05.14 UT: m1=1.6, Dia.=2′, DC=7, Tail=80 arcmin., … 8cm B(11x) … Carlos Labordena (Castellón, España)
2020 July 04.02 UT: m1=0.0, Dia.=3′, DC=1, Tail=~30’ in PA:290 deg., … 15×70 B … Danil Sidorko (Korenovsk, Russia)
2020 July 03.20 UT: m1=0.6*, … 10×50 B … Alan Hale (Cloudcroft, New Mexico, USA) [applying atmospheric extinction, the comet’s elevation was 6.5 degrees and the sun was at –7.5 degrees]
2020 July 03.16 UT: m1=2.5:, Dia.=0.3′, DC=8, Tail=0.1 deg. in PA: 290 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Cueto Rosales, Leon, Spain, 42º 46′ N, 6º 02′ W, alt. 1425 m) [Magnitude estimate corrected for atmospheric extinction with ICQ average table. Very low altitude: 4 deg. Strongly condensed. Mountain location, very clear sky. In-focus method. Tycho-2 comparison stars. SQM: 14.0]
2020 July 03.08 UT: m1=2.5:, Dia.=0.3′, DC=8, Tail=0.1 deg. in PA: 290 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Cueto Rosales, Leon, Spain, 42º 46′ N, 6º 02′ W, alt. 1425 m) [Magnitude estimate corrected for atmospheric extinction with ICQ average table. Very low altitude: 4 deg. Strongly condensed. Mountain location, very clear sky. In-focus method. Tycho-2 comparison stars. SQM: 14.0]
2020 June 06.34 UT: m1=7.6, Dia.=5’, DC=4, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Twilight. Low altitude= 7.1°. Sometimes appears to have a stellar pseudo-nucleus. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 05.34 UT: m1=7.5, Dia.=4’, DC=4, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Twilight, Low altitude= 9.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 04.34 UT: m1=7.5, Dia.=4.4’, DC=4/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Twilight, Low altitude= 11.5°. Diffuse outer coma, opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 03.34 UT: m1=7.7, Dia.=4.5’, DC=4, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Low altitude= 10.2°. Diffuse coma, opaque centre, sometimes appears faintly stellar at centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  30.92 UT: m1=7.3, Dia.=8′, DC=4, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 16°, moonlight]
2020 May  30.35 UT: m1=8.1, Dia.=5’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Low altitude= 13.8°. Diffuse coma, well condensed centre, appears faintly stellar in good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  28.92 UT: m1=7.7, Dia.=8′, DC=3/, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 15°, moonlight]
2020 May  28.35 UT: m1=8.1, Dia.=5.6’, DC=5, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma diffuse, well condensed opaque centre. Altitude= 16.9°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  27.35 UT: m1=8.4, Dia.=6.6’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Diffuse outer coma, opaque inner coma, appears faintly stellar. Enhances in Swan Band filter. Altitude= 18.3°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  26.97 UT: m1=8.0, Dia.=7.0’, DC=4, … 25-cm L f/4.5(56x) … Gonzalo Vargas (Cochabamba Bolivia) [Diffuse compact coma, looks like a no resoluble star globular cluster]
2020 May  25.93 UT: m1=8.2, Dia.=8′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 15°]
2020 May  25.92 UT: m1=8.0, Dia.=10′, DC=4, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 19°]
2020 May  20.96 UT: m1=9.2, Dia.=3.4’, DC=3, … 25-cm L(56x) … Gonzalo Vargas (Cochabamba Bolivia)
2020 May  19.93 UT: m1=9.1, Dia.=6′, DC=2/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  17.93 UT: m1=9.2, Dia.=4′, DC=2, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  16.93 UT: m1=9.5, Dia.=3′, DC=2/, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [near a star with m1: 10.47]
2020 May  16.35 UT: m1=9.1, Dia.=4.2’, DC=5/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma brightens to an opaque inner coma with faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  15.38 UT: m1=9.4, Dia.=4′, … 15×80 B … David A. J. Seargent (Cowra, NSW, Australia) [Enhanced using Swan Band filter]
2020 May  14.36 UT: m1=9.5, Dia.=4′, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 May  14.36 UT: m1=9.7, Dia.=5’, DC=3/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Faint background star in coma to West. Diffuse semi-transparent coma, small opaque weakly condensed centre. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  11.39 UT: m1=9.1, Dia.=4, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Moderate enhancement using Swan Band filter]
2020 May  10.95 UT: m1=10.0, Dia.=3′, DC=3, … 22-cm L (60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [enhancement with comet filter]
2020 May  10.37 UT: m1=9.9, Dia.=4.6’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, very diffuse coma moderately condensed. Close to 10.3 mag star on NW edge of coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 26.94 UT: m1=11.3, Dia.=2′, DC=2/, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 25.42 UT: m1=10.3, Dia.=3′, … 25.4-cm L(71x) … David A. J. Seargent (Cowra, NSW, Australia)
2020 Apr. 25.38 UT: m1=10.3, Dia.=6’, DC=3, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Coma weak and transparent, faint background stars in coma. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 Apr. 24.40 UT: m1=10.8, Dia.=4.9’, DC=2/, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Faint background stars in coma, very diffuse coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 22.45 UT: m1=10.3, Dia.=5’, DC=3/, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, mag 9.8 star in coma on South-West edge. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 21.94 UT: m1=11.8, Dia.=1′, DC=3/, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 19.39 UT: m1=11.4, Dia.=3.2’, DC=3, … 40-cm L(59x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse coma with small opaque centre. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 11.45 UT: m1=13.5:, Dia.=2’, DC=1, … 20-cm L(70x) … Michael Mattiazzo (Swan Hill, Australia)
2020 Apr. 11.38 UT: m1=13.5, Dia.=0.7’, DC=2/, … 25-cm L(125x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, close to mag 11.2 star. Windy conditions. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

C/2020 A2 (Iwamoto)
2020 Mar. 21.46 UT: m1=[12.2, … 40.0-cm L f/4.5(257x) … Seiichi Yoshida (Ibaraki, Japan)
2020 Mar. 15.79 UT: m1=12.5:, Dia.=3′, DC=2, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.35]
2020 Feb. 28.72 UT: m1=11.2, Dia.=2.1′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.30]
2020 Feb. 25.70 UT: m1=11.8, Dia.=1.5′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Feb. 23.84 UT: m1=11.5, Dia.=2′, DC=2, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.41]
2020 Feb. 06.10 UT: m1=10.8, Dia.=2′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.19]
2020 Feb. 05.07 UT: m1=11.3, Dia.=1.7’, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2020 Feb. 03.19 UT: m1=9.6, Dia.=5′, DC=3, … 20-cm SCT(77x) … Juan Jose Gonzalez (Cordal de Neda – Abadín, Lugo, Spain, 43º 21′ N, 7º 27′ W, alt. 780 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2020 Jan. 31.83 UT: m1=10.9, Dia.=2.8′, DC=4/, … 40.0-cm L f/4.5(75x) … Seiichi Yoshida (Ibaraki, Japan)

C/2019 Y4 (ATLAS)
2020 May  18.84 UT: m1=9.8, Dia.=3′, DC=2, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May  18.14 UT: m1=8.2, Dia.=4′, DC=1/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto de la Cubilla, Asturias, Spain, 42º 59′ N, 5º 54′ W, alt. 1680 m) [Astronomical twilight. Mountain location, very clear sky. Altitude: 7°. Sidgwick method. Tycho-2 comparison stars. SQM: 19.2]
2020 May   12.82 UT: m1=8.2, Dia.=15’, … 20×80 B … Toni Scarmato (Calabria, Italy)
2020 May  11.91 UT: m1=9.1, Dia.=&5′, DC=2, … 20.0 L(42x) … Alex Scholten (Eerbeek, Holand) [slightly oval coma]
2020 May  10.82 UT: m1=9.3, Dia.=6′, DC=3/, … 13-cm L(26x) … Alexsandr Morozov (Sukhinichi, Russia)
2020 Apr. 26.80 UT: m1=9.8, Dia.=8′, DC=1/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.42]
2020 Apr. 25.77 UT: m1=9.2, Dia.=2’x4′, DC=2, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 22.84 UT: m1=8.9, Dia.=10′, DC=2/, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.59]
2020 Apr. 19.16 UT: m1=9.4, Dia.=3′, DC=2, … 30×125 B … Carl Hergenrother
2020 Apr. 17.89 UT: m1=8.9, Dia.=8′, DC=1/, … 10×50 B … Piotr Guzik
2020 Apr. 17.88 UT: m1=8.9, Dia.=&8′, DC=2, … 15×80 B … Alex Scholten (Eerbeek, Holand)
2020 Apr. 17.85 UT: m1=9.0, Dia.=2′, DC=3, … 32.0-cm L(45x) … Uwe Pilz
2020 Apr. 17.14 UT: m1=9.2, Dia.=3′, DC=2, … 30×125 B … Carl Hergenrother
2020 Apr. 16.90 UT: m1=9.0, Dia.=9′, DC=2/, … 11.4-cm L(40x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.51]
2020 Apr. 16.79 UT: m1=10.52 CCD, Dia.=1.11′, … 25-cm L+ CCD + R filter … T. Scarmato & A. Brosio (Calabria, Italy) [Afrho=458 cm for 50000 km of spatial aperture]
2020 Apr. 16.21 UT: m1=8.5, Dia.=13′, DC=2, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 15.85 UT: m1=11.28 CCD, Dia.=1.11′, … 25-cm L + CCD + R filter … T. Scarmato & A. Brosio (Calabria, Italy) [Afrho=238 for 50000 km]
2020 Apr. 15.23 UT: m1=8.4, Dia.=13′, DC=2, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 14.90 UT: m1=9.5, Dia.=7′, DC=3, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.77]
2020 Apr. 14.23 UT: m1=8.4, Dia.=13′, DC=1/, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 12.76 UT: m1=10.76 CCD, Dia.=1.11′, … 25-cm L + ccd + R filter … T. Scarmato & A. Brosio (Calabria, Italy) [Afrho=449 cm for 50000 km]
2020 Apr. 11.79 UT: m1=8.7, Dia.=8′, DC=3, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.49]
2020 Apr. 11.19 UT: m1=8.0, Dia.=13′, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 10.77 UT: m1=10.8 CCD, Dia.=1.11′, … 25-cm L + ccd + R filter … Toni Scarmato & A.Brosio (Rosarno, Calabria, Italy) [Afrho 389 cm for 50000 km of aperture]
2020 Apr. 10.75 UT: m1=8.6, Dia.=5′, DC=4/, … 25.4-cm L F/4.7 (70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 09.81 UT: m1=11.7 CCD, Dia.=1.11′, … 25-cm L + CCD + R filter … Toni Scarmato & A. Brosio (Rosarno, Calabria, Italy) [Afrho 190 cm ap 50000 km]
2020 Apr. 08.85 UT: m1=11.2 CCD, Dia.=1.11′, … 25-cm L+ CCD + R filter … Toni Scarmato & A. Brosio (Rosarno, Calabria, Italy) [Afrho 336 cm ap 50000 km, about 50% since my last observation]
2020 Apr. 02.39 UT: m1=8.0, Dia.=9′, DC=3, … 10×50 B … Carl Hergenrother
2020 Apr. 02.23 UT: m1=6.9:, Dia.=19′, DC=2, … 10×50 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 02.22 UT: m1=7.3, Dia.=15′, DC=3, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 02.12 UT: m1=7.8, Dia.=9′, DC=3/, … 12-cm R(30x) … Maik Meyer
2020 Apr. 02.08 UT: m1=8.1, Dia.=9′, DC=4, … 25×100 B … Piotr Guzik
2020 Apr. 01.10 UT: m1=7.8, Dia.=9′, DC=3/, … 12-cm R(30x) … Maik Meyer
2020 Apr. 01.06 UT: m1=7.9, Dia.=10′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 31.77 UT: m1=8.2, Dia.=10′, DC=4, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Moon 43%]
2020 Mar. 31.11 UT: m1=7.6, Dia.=&15′, DC=2, … 15×80 B … Alex Scholten
2020 Mar. 30.78 UT: m1=7.9, Dia.=10′, DC=4, … 10×50 B … Piotr Guzik
2020 Mar. 30.28 UT: m1=8.0, Dia.=10′, DC=3, … 10×50 B … Carl Hergenrother
2020 Mar. 30.23 UT: m1=7.0, Dia.=19′, DC=3, … 10×50 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Mar. 29.90 UT: m1=7.6, Dia.=10.5′, DC=4, … 12-cm R(30x) … Maik Meyer
2020 Mar. 29.08 UT: m1=7.7, Dia.=10′, DC=3/, … 10×50 B … Piotr Guzik
2020 Mar. 28.97 UT: m1=7.9, Dia.=7′, DC=5, … 7×50 B … Toni Scarmato
2020 Mar. 28.95 UT: m1=8.5, Dia.=8.5′, DC=5/, … 25×100 B … Jakub Cerny
2020 Mar. 28.87 UT: m1=7.7, Dia.=&15′, DC=2, … 15×80 B … Alex Scholten
2020 Mar. 28.86 UT: m1=7.5, Dia.=9.5′, DC=4, … 12-cm R(30x) … Maik Meyer
2020 Mar. 28.13 UT: m1=7.2, Dia.=15′, DC=4, … 10×50 B … Carl Hergenrother
2020 Mar. 28.12 UT: m1=7.6, Dia.=9′, DC=5, … 30×125 B … Carl Hergenrother
2020 Mar. 27.84 UT: m1=7.7, Dia.=&15′, DC=2, … 15×80 B … Alex Scholten
2020 Mar. 27.82 UT: m1=7.6, Dia.=10.5′, DC=4, … 12-cm R(30x) … Maik Meyer
2020 Mar. 27.78 UT: m1=8.0, Dia.=8′, DC=3/, … 10×50 B … Piotr Guzik
2020 Mar. 26.97 UT: m1=7.9, Dia.=10′, DC=4, … 10×50 B … Piotr Guzik
2020 Mar. 25.89 UT: m1=8.4, Dia.=9′, DC=6, no tail, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Mar. 25.82 UT: m1=7.6, Dia.=11.5′, DC=4, … 12-cm R(30x) … Maik Meyer
2020 Mar. 25.77 UT: m1=8.0, Dia.=10′, DC=4, … 10×50 B … Piotr Guzik
2020 Mar. 25.16 UT: m1=8.0, Dia.=8′, DC=4, … 30×125 B … Carl Hergenrother
2020 Mar. 25.05 UT: m1=8.1, Dia.=10′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 24.83 UT: m1=8.4, Dia.=&12′, DC=2, … 15×80 B … Alex Scholten
2020 Mar. 24.82 UT: m1=7.6, Dia.=10.5′, DC=4, … 12-cm R(30x) … Maik Meyer
2020 Mar. 24.80 UT: m1=8.3, Dia.=10.5′, DC=4/, … 20×80 B … Marek Biely
2020 Mar. 24.78 UT: m1=8.2, Dia.=11′, DC=5, … 25.4-cm L(48x) … Alexsandr Morozov
2020 Mar. 24.14 UT: m1=7.9, Dia.=9′, DC=4, … 30×125 B … Carl Hergenrother
2020 Mar. 24.00 UT: m1=8.1, Dia.=12′, DC=3/, … 10×50 B … Piotr Guzik
2020 Mar. 23.90 UT: m1=8.7, Dia.=8.8′, DC=4, … 25×100 B … Jakub Cerny
2020 Mar. 23.90 UT: m1=8.7, Dia.=8.5′, DC=3/, … 20×80 B … Marek Biely
2020 Mar. 23.81 UT: m1=7.6, Dia.=10′, DC=4, … 12-cm R(30x) … Maik Meyer
2020 Mar. 22.84 UT: m1=8.4, Dia.=&12′, DC=2, … 15×80 B … Alex Scholten
2020 Mar. 22.81 UT: m1=7.8, Dia.=10′, DC=3, … 7×50 B … Uwe Pilz
2020 Mar. 22.81 UT: m1=7.7, Dia.=12′, DC=3/, … 12-cm R(30x) … Maik Meyer
2020 Mar. 22.13 UT: m1=7.9, Dia.=9′, DC=4, … 30×125 B … Carl Hergenrother
2020 Mar. 22.12 UT: m1=8.1, Dia.=12′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 22.85 UT: m1=8.9, Dia.=&10′, DC=3, … 15×80 B … Alex Scholten
2020 Mar. 21.81 UT: m1=7.7, Dia.=12′, DC=3/, … 12-cm R(30x) … Maik Meyer
2020 Mar. 21.43 UT: m1=8.9, Dia.=6.5′, DC=2/, … 40.0-cm L f/4.5(36x) … Seiichi Yoshida
2020 Mar. 21.16 UT: m1=8.5, Dia.=5′, DC=2, … 20-cm L(42x) … Alex Scholten
2020 Mar. 20.17 UT: m1=8.1, Dia.=8′, DC=3, … 30×125 B … Carl Hergenrother
2020 Mar. 19.81 UT: m1=7.9, Dia.=13′, DC=3, … 12-cm R(30x) … Maik Meyer
2020 Mar. 19.18 UT: m1=8.0, Dia.=15′, DC=1/, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Mar. 18.86 UT: m1=8.4, Dia.=10′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 18.80 UT: m1=8.0, Dia.=12.5′, DC=3, … 12.0-cm R f/5(30x) … Maik Meyer
2020 Mar. 17.87 UT: m1=8.4, Dia.=10′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 17.80 UT: m1=8.0, Dia.=11′, DC=3, … 12-cm R(30x) … Maik Meyer
2020 Mar. 16.88 UT: m1=8.5, Dia.=12′, DC=4, … 8×26 B … Timo Karhula
2020 Mar. 16.77 UT: m1=8.4, Dia.=12′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 15.80 UT: m1=8.5, Dia.=14′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 15.80 UT: m1=8.7, Dia.=12′, DC=3, … 20×100 B … Sandor Szabo
2020 Mar. 15.80 UT: m1=8.4, Dia.=9.5′, DC=3, … 12-cm R(30x) … Maik Meyer
2020 Mar. 15.77 UT: m1=8.5, Dia.=10′, DC=4/, … 25.4-cm L(30x) … Alexsandr Morozov
2020 Mar. 15.12 UT: m1=8.4, Dia.=9′, DC=4, … 30×125 B … Carl Hergenrother
2020 Mar. 14.94 UT: m1=8.6, Dia.=12′, DC=3, … 10×50 B … Piotr Guzik
2020 Mar. 14.90 UT: m1=8.6, Dia.=12′, DC=3, … 11×80 B … Carles Labordena
2020 Mar. 14.85 UT: m1=8.2, Dia.=12′, DC=3, … 10×50 B … Juan Jose Gonzalez
2020 Mar. 14.80 UT: m1=8.4, Dia.=11′, DC=3, … 12-cm R(30x) … Maik Meyer
2020 Mar. 13.96 UT: m1=8.6, Dia.=10′, DC=3, … 18×50 B … Timo Karhula
2020 Mar. 13.77 UT: m1=9.0, Dia.=10′, DC=2, … 10×50 B … Piotr Guzik
2020 Mar. 13.73 UT: m1=9.5, Dia.=6.5′, DC=4, … 25.4-cm L(70.5x) … Danil Sidorko
2020 Mar. 12.82 UT: m1=9.2, Dia.=–‘, DC=–, … 7×50 B … Uwe Pilz
2020 Mar. 12.81 UT: m1=8.9, Dia.=&7′, DC=2, … 20-cm L(42x) … Alex Scholten
2020 Mar. 12.80 UT: m1=9.0, Dia.=7′, DC=2, … 12-cm R(30x) … Maik Meyer
2020 Mar. 12.77 UT: m1=9.6, Dia.=7′, DC=3, … 25×100 B … Piotr Guzik
2020 Mar. 12.77 UT: m1=9.4, Dia.=10′, DC=2, … 10×50 B … Piotr Guzik
2020 Mar. 12.73 UT: m1=10.2, Dia.=2.5′, DC=5, … 25.4-cm L(70.5x) … Danil Sidorko
2020 Mar. 11.78 UT: m1=9.5, Dia.=&12′, DC=2, … 10×50 B … Piotr Guzik
2020 Mar. 11.77 UT: m1=9.8, Dia.=8′, DC=3, … 25×100 B … Piotr Guzik
2020 Mar. 06.45 UT: m1=11.5, Dia.=5′, DC=4, … 38-cm L(64x) … Bob King
2020 Mar. 05.27 UT: m1=10.7 CCD G, Dia.=12.4′, DC=-, … 28-cm T f/2.2 + CCD G … Terry Lovejoy
2020 Mar. 03.88 UT: m1=12.4 CCD G, Dia.=2.4′, DC=-, … 28-cm T f/2.2 + CCD G … Michael Jäger
2020 Feb. 29.96 UT: m1=11.9, Dia.=1.5′, DC=3, … 25.4-cm L(120x) … Alexsandr Morozov
2020 Feb. 28.80 UT: m1=12.6, Dia.=1.2′, DC=5, … 60.0-cm L(244x) … Sandor Szabo
2020 Feb. 28.15 UT: m1=11.5 CCD G, Dia.=0.25′, DC=-, … 28-cm T f/2.2 + CCD G … Michael Jäger
2020 Feb. 24.89 UT: m1=13.2, Dia.=1.7′, DC=4, … 60.0-cm L(187x) … Sandor Szabo
2020 Feb. 24.22 UT: m1=13.3, Dia.=0.9’, DC=3/, … 41-cm L(70x) … Alan Hale
2020 Feb. 20.10 UT: m1=13.8, Dia.=1.3′, DC=4, … 38-cm L(242x) … Bob King
2020 Feb. 19.94 UT: m1=11.7, Dia.=3′, DC=2, … 20-cm SCT(77x) … Juan Jose Gonzalez
2020 Feb. 18.93 UT: m1=14.4, Dia.=0.7′, DC=3, … 60.0-cm L f/4(305x) … Sandor Szabo (Sopron, Hungary)
2020 Feb. 18.81 UT: m1=14.7, Dia.=0.5′, DC=4, … 60.0-cm L f/4(305x) … Sandor Szabo (Sopron, Hungary)
2020 Feb. 18.39 UT: m1=12.5 CCD, Dia.=4′, … 28-cm SCT + CCD … Michael Mattiazzo (T68 New Mexico remotely, Australia)
2020 Feb. 17.27 UT: m1=13.8, Dia.=4.4′, … Carl Hergenrother
2020 Feb. 17.10 UT: m1=14.0, Dia.=0.5’, … 38-cm L(200x) … Bob King (Minnesota, USA)
2020 Feb. 03.94 UT: m1=16.5 CCD, Dia.=0.4, … 20.0-cm L + CCD … Artyom Novichonok

C/2019 Y1 (ATLAS)
2020 June 20.98 UT: m1=11.5, Dia.=2′, 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: 21.3]
2020 May  27.94 UT: m1=9.8, Dia.=4′, DC=2/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto Ventana, Asturias, Spain, 43º 03′ N, 6º 00′ W, alt. 1580 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 May  26.02 UT: m1=9.8, Dia.=5′, DC=2/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Renorios – Bello – Aller, Asturias, Spain, 43º 08′ N, 5º 38′ W, alt. 1200 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2020 May  21.76 UT: m1=10.1, Dia.=&3′, DC=3, … 10.2-cm R(58.8x) … Andrey Semenyuta (Pavlodar, Kazakhstan)
2020 May  19.80 UT: m1=10.2, Dia.=2′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May 18.90 UT: m1=9.6, Dia.=5′, DC=3, no tail, … 15-cm L(44x) … Carlos Labordena (Castellón, España)
2020 May  18.09 UT: m1=9.5, Dia.=5′, DC=3, … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto de la Cubilla, Asturias, Spain, 42º 59′ N, 5º 54′ W, alt. 1680 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2020 May  17.85 UT: m1=9.6, Dia.=6′, DC=3, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May  11.80 UT: m1=9.0, Dia.=3′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May  10.84 UT: m1=9.5, Dia.=5′, DC=5, … 13-cm L(26x) … Alexsandr Morozov (Sukhinichi, Russia)
2020 Apr. 30.77 UT: m1=8.1, Dia.=4′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 29.78 UT: m1=7.8, Dia.=5.5′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 28.12 UT: m1=8.8, Dia.=4′, DC=4, no tail, … 23.5-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 Apr. 26.78 UT: m1=8.5, Dia.=4′, DC=4/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.35]
2020 Apr. 25.77 UT: m1=7.5, Dia.=4.5′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 22.83 UT: m1=7.8, Dia.=4.5′, DC=4/, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.59]
2020 Apr. 16.88 UT: m1=8.2, Dia.=6′, DC=5, … 11.4-cm L(25x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.51]
2020 Apr. 15.50 UT: m1=8.9, Dia.=6′, DC=2, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 14.88 UT: m1=8.7, Dia.=3′, DC=4/, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.77]
2020 Apr. 11.76 UT: m1=8.4, Dia.=3.8′, DC=4, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.41]
2020 Mar. 31.74 UT: m1=9.0, Dia.=1.5′, DC=4/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Moon 43%]
2020 Mar. 24.75 UT: m1=9.0, Dia.=2.5′, DC=4/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.30]
2020 Mar. 18.79 UT: m1=7.7, Dia.=5′, DC=3/, … 12.0-cm R f/5(30x) … Maik Meyer (Linter Germany)
2020 Mar. 15.73 UT: m1=8.9, Dia.=3.5′, DC=4/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.35]
2020 Mar. 14.83 UT: m1=8.4, Dia.=3′, DC=7, … 25×100 B … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 11°. Morris method. Tycho-2 comparison stars. SQM: 20.8]
2020 Mar. 14.82 UT: m1=9.3, Dia.=2.5′, DC=6, … 15-cm L(30x) … Carlos Labordena (Castellón, España)
2020 Feb. 21.79 UT: m1=9.7, Dia.=3′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Feb. 19.81 UT: m1=9.6, Dia.=4′, DC=3, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Zodiacal light. Altitude: 16°. Sidgwick method. Tycho-2 comparison stars. SQM: 20.4]
2020 Feb. 14.79 UT: m1=10.8, Dia.=1.5′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España) [no tail]
2020 Jan. 31.78 UT: m1=11.7, Dia.=2′, DC=3, … 23.5-cm SCT(94x) … Carlos Labordena (Castellón, España) [no tail]
2020 Jan. 31.40 UT: m1=11.4, Dia.=1.4′, DC=3/, … 40.0-cm L f/4.5(144x) … Seiichi Yoshida (Ibaraki, Japan)

C/2019 U6 (Lemmon)
2020 Sep. 21.48 UT: m1=13.0, Dia.=1.2′, DC=2, … 40.0-cm L f/4.5(144x) … Seiichi Yoshida (Ibaraki, Japan)
2020 Sep. 15.76 UT: m1=12.6, Dia.=2′, DC=2, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Sep. 11.87 UT: m1=11.8, Dia.=1.5′, DC=2, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Sep. 09.87 UT: m1=10.3:, 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) [Mag. 11.1 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2020 Sep. 08.40 UT: m1=12.6, Dia.=1.8’, DC=2, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Difficult, very diffuse. Altitude= 15.8°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Sep. 07.89 UT: m1=10.2, 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: 21.3]
2020 Aug. 24.40 UT: m1=10.9, Dia.=2.8’, DC=2/, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Very diffuse and difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Aug. 15.90 UT: m1=10.4, Dia.=5′, DC=2, … 20-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 Aug. 13.67 UT: m1=[9.5, … 10.2-cm R(58x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [lm=4.7]
2020 Aug. 13.92 UT: m1=10.1, Dia.=6′, DC=2/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 Aug. 10.83 UT: m1=10.0, Dia.=4′, DC=3, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 08.95 UT: m1=10.5, Dia.=2.5′, DC=4, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 07.90 UT: m1=10.2, Dia.=3′, DC=2, … 12.5-cm L(61x) … Valentín Díaz (La Romaneta, Alicante, España)
2020 Aug. 06.83 UT: m1=10.2, Dia=2.5′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Aug. 05.35 UT: m1=10.2:, Dia.=3.7’, DC=3, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Star in coma, magnitude uncertain. Diffuse coma, hint of tail to the ESE. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 Aug. 01.91 UT: m1=9.7, Dia.=3′, DC=3, … 20-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 July 30.35 UT: m1=9.3, Dia= 5.4’, DC=3/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Diffuse, weakly condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 July 27.92 UT: m1=9.0:, Dia.=3′, DC=4, … 9-m R f/5.5(34x) … Willian Souza (Sao Paulo, Brazil)
2020 July 24.94 UT: m1=8.2, Dia.=10′, DC=3/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 17 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 July 23.93 UT: m1=9.0, Dia.=4′, DC=4/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 July 21.93 UT: m1=8.9, Dia.=4′, DC=4/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 21.35 UT: m1=8.4, Dia.=9’, DC=3/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma, opaque inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 20.95 UT: m1=8.3, Dia.=7′, DC=3/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 13 deg. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2020 July 19.93 UT: m1=8.7, Dia.=4′, DC=3/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 19.36 UT: m1=8.5, Dia.=9’, DC=5, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma, brightening to a well condensed and opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 18.89 UT: m1=8.4, Dia.=5′, DC=4, … 20-cm L(95x) … Carlos Labordena (Castellón, España)
2020 July 17.93 UT: m1=8.5, Dia.=5′, DC=4, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 17.38 UT: m1=7.4:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 July 12.95 UT: m1=7.9, Dia.=5′, DC=4/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 11.95 UT: m1=7.8, Dia.=5′, DC=4/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 11.91 UT: m1=7.7, Dia.=7′, DC=4, … 8-cm B(20x) … Valentín Díaz (Cancarix, Albacete, España)
2020 July 11.89 UT: m1=7.7, Dia.=5′, DC=3, no tail, … 15-cm L(44x) … Carlos Labordena (Castellón, España)
2020 July 10.93 UT: m1=7.7, Dia.=5′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 08.92 UT: m1=7.6, Dia.=4′,DC=4, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 July 07.92 UT: m1=7.6, Dia.=6′, DC=4/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 07.91 UT: m1=7.4, Dia.=6′, DC=4, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 12 deg. Astronomical twilight. Mountain location, clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2020 July 07.38 UT: m1=6.8:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 July 07.36 UT: m1=7.8, Dia.=9’, DC=5, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, fading to edges, well condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 05.92 UT: m1=7.5, Dia.=6′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2020 July 05.88 UT: m1=7.7, Dia.=6′, DC=4, no tail, … 15-cm L(30x) … Carlos Labordena (Castellón, España)
2020 July 04.92 UT: m1=7.4, Dia.=6′, DC=5, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2020 July 03.37 UT: m1=7.6, Dia.=9’, DC=4/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Hazy coma with a moderately condensed opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 01.92 UT: m1=7.0, Dia.=6′, DC=6, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 June 30.35 UT: m1=7.1, Dia.=8.5’, DC=5, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Diffuse coma, opaque centre, semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 29.36 UT: m1=7.1, Dia.=9’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 28.92 UT: m1=6.8, Dia.=6′, DC=5, Tail=30 arcmin. in PA: 120 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2020 June 28.35 UT: m1=6.2, Dia.=8′, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 June 24.94 UT: m1=6.5, Dia.=8′, DC=4/, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 24.92 UT: m1=6.8, Dia.=8′, DC=4, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 June 21.91 UT: m1=6.6, Dia.=9′, DC=5, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 June 21.35 UT: m1=6.7, Dia.=12’, DC=4/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 53’ in length in P.A. 125° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 20.96 UT: m1=6.3, Dia.=7′, DC=7, Tail=60 arcmin. in PA: 120 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 20.95 UT: m1=6.2, Dia.=9′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 20.91 UT: m1=6.5, Dia.=9′, DC=4/, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 June 19.93 UT: m1=6.2, Dia.=9′, DC=5/, Tail=1° in PA: 125 deg., … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 19.91 UT: m1=6.5, Dia.=8′, DC=5, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 June 19.36 UT: m1=6.7, Dia.=9’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 27’ in length in P.A. 130° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 17.99 UT: m1=6.2, Dia.=7, DC=6, … 25-cm L F/4.5(45x) … Gonzalo Vargas (Cochabamba Bolivia) [Faint tail 18′ long in a PA: 135° to 140 °]
2020 June 17.36 UT: m1=6.5, Dia.=8’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 26’ in PA: 137° approx. Star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 16.98 UT: m1=6.4, Dia.=7′, DC=5, … 25-cm L F/4.5(45x) … Gonzalo Vargas (Cochabamba Bolivia) [A faint tail is visible with around 16′ long in a PA: 110° to 135°]
2020 June 16.35 UT: m1=6.4, Dia.=8.5’, DC=5, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 22’ in PA: 136° approx., close to star. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 13.94 UT: m1=6.2, Dia.=7′, DC=7, Tail=30 arcmin. in PA: 130 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 13.93 UT: m1=6.0, Dia.=8′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 11.93 UT: m1=6.3, Dia.=7′, DC=7, Tail=30 arcmin. in PA: 135 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Thin clouds]
2020 June 11.92 UT: m1=6.1, Dia.=8′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Thin clouds]
2020 June 11.35 UT: m1=6.4, Dia.=8.5’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Coma enhances strongly in Swan Band filter. Background star in coma. Hint of faint tail to the SE approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 08.35 UT: m1=6.7, Dia.=8’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 15’ in length in PA: 141° approximately. Coma well condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 07.93 UT: m1=6.6, Dia.=7′, DC=7, Tail= 45 arcmin. in AP: 135 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 07.92 UT: m1=6.5, Dia.=8′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 07.91 UT: m1=6.2, Dia.=5′, DC=6, … 10×50 B … Willian Souza (Sao Paulo, Brazil)
2020 June 06.35 UT: m1=6.8, Dia.=6’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Coma diffuse, hint of tail to SE approximately, faint stellar pseudo-nucleus visible. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 05.35 UT: m1=6.8, Dia.=6’, DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Coma diffuse, opaque centre, faint stellar pseudo-nucleus sometimes visible. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 04.36 UT: m1=6.8, Dia.=6.5’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma diffuse with an opaque inner coma and faintly stellar pseudo-nucleus. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 03.35 UT: m1=6.5:, Dia.=6.3’; DC=5/, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Magnitude uncertain due to mag 8.0 star in coma. Bright central condensation, diffuse outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  31.92 UT: m1=6.5, Dia.=8’, DC=4, … 10.5-cm MC-T(45x) … Alberto Anunziato (Paraná, Argentina) [No tail, Mét. Sidgwick, Cat. Tycho II]
2020 May  30.94 UT: m1=6.7, Dia.=7′, DC=6/, Tail=30 arcmin. in PA: 135 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 May  30.93 UT: m1=6.6, Dia.=8′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 May  30.35 UT: m1=7.2, Dia.=6.5’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma faintly stellar at centre, opaque inner coma fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  28.93 UT: m1=6.7, Dia.=6′, DC=6/, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 May  28.35 UT: m1=7.4, Dia.=6.3’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Bright opaque centre, fading to edges, faint stellar pseudo-nucleus visible. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  27.35 UT: m1=7.2, Dia.=5’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Close to bright star. Stellar pseudo-nucleus with bright and opaque inner coma fading to edges. Enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  25.95 UT: m1=7.0, Dia.=7′, DC=6/, … Tail=45 arcmin. in AP: 140 deg., … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 20°]
2020 May 25.94 UT: m1=6.9, Dia.=8′, DC=6, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 23°]
2020 May 24.99 UT: m1=6.8, Dia.=7.6’, DC=6 … 25-cm L f/4.5(56x) … Gonzalo Vargas (Cochabamba, Bolivia) [A faint and broad tail from PA 78 to 130 degrees is better view when I slightly shake the telescope, a Sky Glow filter was used]
2020 May 23.99 UT: m1=7.0, Dia.=7.4’, DC=5, … 25-cm L f/4.5(56x) … Gonzalo Vargas (Cochabamba, Bolivia)
2020 May  21.95 UT: m1=7.1, Dia.=7’, DC=5, … 25-cm L f/4.5(56x) … Gonzalo Vargas (Cochabamba, Bolivia) [Comet’s coma appear some longer from AP angle from 165 to 177 degrees, some moments like a border tail, best view with averted vision]
2020 May  19.95 UT: m1=7.4, Dia.=6′, DC=6/, Tail=30 arcmin. in PA: 135°, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  19.94 UT: m1=7.4, Dia.=7′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  17.95 UT: m1=7.4, Dia.=6′, DC=6, Tail=30 arcmin. in PA: 135°, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  17.94 UT: m1=7.4, Dia.=7′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  17.36 UT: m1=7.3, … 10×50 … David A. J. Seargent (Cowra, NSW, Australia)
2020 May  16.98 UT: m1=8.3, Dia.=5.0’, DC=5, … 25-cm L(56x) … Gonzalo Vargas (Cochabanba Bolivia)
2020 May  16.95 UT: m1=7.5, Dia.=6′, DC=5, Tail=15 arcmin. in PA: 135°, … 20 x 100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [near star with m1: 8.09]
2020 May  16.94 UT: m1=7.4, Dia.=6′, DC=5, … 7×50 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  16.35 UT: m1=7.9, Dia.=5.2’, DC=6, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Close to stars, Opaque centre with faint stellar pseudo-nucleus, semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  15.37 UT: m1=7.4, … 10×50 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 May  14.38 UT: m1=7.9, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 May  14.35 UT: m1=8.0, Dia.=6.4’, DC=6, … 10×50 R … Chris Wyatt (Walcha, NSW, Australia) [Small diffuse and opaque outer coma, slightly brighter inner coma with stellar pseudo-nucleus. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  11.92 UT: m1=7.9, Dia.=4, DC=6, … 25×100 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  11.38 UT: m1=8.4, D=6, DC=5, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Some enhancement using Swan Band filter]
2020 May  10.93 UT: m1= 7.8, Dia.=6′, DC=5, Tail= 15 arcmin. in PA: 120°, … 20 x 100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  10.92 UT: m1=7.9, Dia.=3′, DC=6, … 25×100 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  10.36 UT: m1=8.1, Dia.=7.3’, DC=6, … 11×70 B … Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, brightening to an opaque centre. Well condensed centre with stellar pseudo-nucleus. Enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 May  09.90 UT: m1=7.8, Dia.=4, DC=6, … 25×100 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 May  08.91 UT: m1=8.0, Dia.=3, DC=6, … 25×100 B … José Guilherme de S. Aguiar (Campinas/SP, Brazil)
2020 Apr. 26.93 UT: m1=9.6, Dia.=4′, DC=3, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 25.37 UT: m1=9.3, Dia.=5.5’, DC=5, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, semi-transparent outer edge brightening to an opaque inner coma, almost stellar at centre. Enhances well in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 24.38 UT: m1=9.3, Dia.=5’, DC=5/, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Coma pale auqa-blue in colour, faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 22.40 UT: m1=9.6, Dia.=5.3’, DC=5/, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Enhances strongly in Swan Band filter. Very diffuse outer coma, sometimes appears to have a faint stellar pseudo-nucleus at centre. Inner coma appears elongated to the NW. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 19.94 UT: m1=10.3, Dia.=2′, DC=4, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 19.38 UT: m1=10.4, Dia.=3.8’, DC=5, … 40-cm L(59x) … Chris Wyatt (Walcha, NSW, Australia) [Star in coma. Coma shows opaque centre, fading to edges, semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 17.39 UT: m1=10.2, Dia.=4.6’, DC=4, … 25-cm L(40x) … Chris Wyatt (Walcha, NSW, Australia) [Coma shows opaque centre, moderately condensed fading to semi-transparent outer coma. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 16.42 UT: m1=10.6, DC=4, … 25.4-cm L(71x) … David A. J. Seargent (Cowra, NSW, Australia) [Marginally enhanced through Swan Band filter]
2020 Apr. 14.40 UT: m1=10.4, Dia.=4.2’, DC=4, … 25-cm L(40x) … Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Very diffuse semi-transparent outer coma brightening to an opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 11.40 UT: m1=10.7, Dia.=3’, DC=3, … 20-cm L(70x) … Michael Mattiazzo (Swan Hill, Australia)
2020 Apr. 11.39 UT: m1=10.5, Dia.=4.8’, DC=4/, … 25-cm L(40x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse semi-transparent outer coma, moderately condensed and opaque inner coma. Enhances in Swan Band filter. Windy conditions. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 31.42 UT: m1=12.3, Dia.=2.5’, DC=2/, … 25-cm L(74x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight … Outer coma diffuse, subtle brightening to centre. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Mar. 30.98 UT: m1=11.5, Dia.=1.5′, DC=3/, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Mar. 20.42 UT: m1=12.4, Dia.=2.2’, DC=3, … 40-cm L f:4.5(108x) … Chris Wyatt (Walcha, NSW, Australia) [Asteroid showing cometary activity. Mag 14.7 background star in coma. Coma well diffused with opaque central condensation. Slight enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 19.41 UT: m1=12.8, Dia.=2.2’, DC=3/, … 40-cm L f:4.5(108x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse and transparent and quite extended from the centre, inner coma opaque and moderately condensed. Asteroid showing cometary activity. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 18.41 UT: m1=13.5, Dia.=1.4’, DC=3, … 40-cm L f:4.5(108x) … Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Asteroid showing cometary activity. Coma diffuse with weakly condensed centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

C/2019 N1 (ATLAS)
2020 Aug. 13.89 UT: m1=10.6, Dia.=5′, DC=3, … 20-cm SCT(100x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2020 July 24.92 UT: m1=11.7, 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: 21.3]

C/2018 N2 (ASASSN) 
2020 Jan. 31.48 UT: m1=12.5, Dia.=0.7′, DC=3/, … 40.0-cm L f/4.5(144x) … Seiichi Yoshida (Ibaraki, Japan)
2020 Jan. 29.79 UT: m1=12.4, Dia.=0.9′, DC=3, … 25.4-cm L f/5(104x) … Maik Meyer (Linter, Germany)
2020 Jan. 25.68 UT: m1=12.6, Dia.=0.5′, DC=3, … 25-cm L F:5(150x) … Danil Sidorko (Korenovsk, Russia)
2020 Jan. 23.68 UT: m1=12.6, Dia.=1′, DC=2, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.41]
2020 Jan. 15.71 UT: m1=12.7, Dia.=0.7′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2020 Jan 03.95 UT: m1=12.3, Dia.=0.8′, DC=3, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]

C/2018 F4 (PanSTARRS)
2020 Aug. 26.77 UT: m1=15.1, Dia.=0.2’, DC=4, … 40-cm L f:4(182x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse and difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 24.38 UT: m1=13.9, Dia.=0.7’, DC=2/, … 40-cm L f:4(182x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.2° … Poor seeing, difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 22.38 UT: m1=13.9, Dia.=1’, DC=2/, … 40-cm L f:4(108x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.7° … Very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 19.38 UT: m1=13.7, Dia.=0.8’, DC=2/, … 40-cm L(182x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 14.1°. Diffuse, weakly condensed. Visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Mar. 20.41 UT: m1=14.1, Dia.=1’, DC=3/, … 40-cm L f:4.5(108x) … Chris Wyatt (Walcha, NSW, Australia) [Moderately condensed and opaque inner coma surrounded by transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 19.40 UT: m1=14.0, Dia.=1’, DC=4, … 40-cm L f:4.5(108x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small and moderately condensed centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 18.39 UT: m1=14.0, Dia.=1’, DC=3/, … 40-cm L f:4.5(108x) … Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, diffuse outer coma, small and moderately condensed central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

C/2017 T2 (PANSTARRS)
2020 Sep. 11.85 UT: m1=11.2, Dia.=2′, DC=2, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Sep. 09.84 UT: m1=10.2, Dia.=6′, DC=1/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 15 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2020 Aug. 24.39 UT: m1=11.8, Dia.=1.6’, DC=3, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Diffuse and difficult to see. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Aug. 15.89 UT: m1=10.9, Dia.=3′, DC=2, … 20-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 Aug. 13.90 UT: m1=10.4, Dia.=6′, DC=2/, … 20-cm SCT(100x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Mag. 10.6 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 Aug. 08.96 UT: m1=10.3, Dia.=3′, DC=3, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 01.93 UT: m1=10.7, Dia.=2′, DC=3, … 20-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 July 24.95 UT: m1=9.8, Dia.=6′, 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: 21.4]
2020 July 21.36 UT: m1=10.4, Dia.=5’, DC=3/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse, coma appears slightly elongated to the NE approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 20.96 UT: m1=9.6, Dia.=6′, DC=4, … 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]
2020 July 19.37 UT: m1=10.3, Dia.=2.8’, DC=4/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse, moderately condensed opaque centre fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 18.90 UT: m1=10.3, Dia.=3′, DC=3, … 20-cm L(95x) … Carlos Labordena (Castellón, España)
2020 July 16.88 UT: m1=10.4, Dia.=3′, DC=3, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 July 12.96 UT: m1=10.0, Dia.=2.5′, DC=3, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 11.95 UT: m1=10.9, Dia.=3.5′, DC=4, … 28-cm-SCT(93x) … Valentín Díaz (Cancarix, Albacete, España)
2020 July 11.94 UT: m1=10.0, Dia.=2′, DC=3, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 11.90 UT: m1=9.8, Dia.=2′, DC=3, no tail, … 15-cm L(44x) … Carlos Labordena (Castellón, España)
2020 July 09.89 UT: m1=10.3, Dia.=2.5′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 July 08.38 UT: m1=10.1:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Very diffuse]
2020 July 07.35 UT: m1=10.1, Dia.=4.8’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight brightening to centre. Dims slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 30.35 UT: m1=9.7, Dia.=3.1’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Low altitude= 16.5°, Coma centre opaque, fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 29.94 UT: m1=10.1, Dia.=4′, DC=3, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 June 23.88 UT: m1=9.4, Dia.=5′, DC=4/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 June 22.89 UT: m1=9.9, Dia.=3′, DC=4, … 20-cm SCT(66x) … Valentín Díaz (La Romaneta, Alicante, España)
2020 June 21.00 UT: m1=9.1, Dia.=5′, DC=4, … 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]
2020 June 20.94 UT: m1=9.3, Dia.=3′, DC=3, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 20.93 UT: m1=9.2, Dia.=4′, DC=2/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 20.91 UT: m1=9.2, Dia.=2′, DC=2, no tail, … 20-cm SCT(57x) … Carlos Labordena (Castellón, España)
2020 June 19.91 UT: m1=9.9, Dia.=5′, DC=4, … 12.7-cm L(45x) … Valentín Díaz (La Romaneta, Alicante, España)
2020 June 19.35 UT: m1=9.4, Dia.=4’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 8.0°; Diffuse and transparent outer coma brightening to an opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 June 17.34 UT: m1=9.7, Dia.=5.5’, DC=3, … 25cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 6.6°. Diffuse, opaque centre, weakly condensed. Galaxy NGC 3953 noticeable in the field to the SW. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 June 16.88 UT: m1=9.5, Dia.=4′, DC=4, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 June 16.34 UT: m1=9.8, Dia.=3’, DC=4, … 25cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 5.8°. Diffuse outer coma, opaque inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2020 June 15.34 UT: m1=9.8:, Dia.=2’, DC=2/, … 25cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain due to very low altitude (= 5.0°) and 10.6 mag star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 June 13.92 UT: m1=9.1, Dia.=3′, DC=3, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 13°]
2020 June 12.90 UT: m1=8.9, Dia.=4′, DC=4, no tail, … 15-cm L(30x) … Carlos Labordena (Castellón, España)
2020 June 10.90 UT: m1=9.3, Dia.=3.5′, DC=3/, … 11.4-cm L(40x) … Alexsandr Morozov (Novozybkov, Russia)
2020 June 08.90 UT: m1=9.4, Dia.=4.5′, DC=5, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 June 07.90 UT: m1=8.5, Dia.=5′, DC=3, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma, no visible tail, slightly weaker]
2020 May  28.77 UT: m1=8.9, Dia.=3.2′, DC=6, … 10.2-cm R(40x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [method S, lm=4.8]
2020 May  27.93 UT: m1=8.5, Dia.=5′, DC=5, Tail=0.2 deg. in PA: 280 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto Ventana, Asturias, Spain, 43º 03′ N, 6º 00′ W, alt. 1580 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 May  27.85 UT: m1=8.6, Dia.=5′, DC=5, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May  27.88 UT: m1=8.3, Dia.=4′, DC=4, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma; no visible tail; Moon: 25%]
2020 May  27.82 UT: m1=8.1, Dia.=5.5′, DC=4, … 25.4-cm L F/4.7(40x, 70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May 26.88 UT: m1=9.0, Dia.=5′, DC=4, … 20×80 B … Valentín Díaz (La Roamneta, Alicante, España)
2020 May 26.00 UT: m1=8.6, Dia.=5′, DC=5, Tail=0.2 deg. in PA: 280 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Renorios – Bello – Aller, Asturias, Spain, 43º 08′ N, 5º 38′ W, alt. 1200 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2020 May 23.91 UT: m1=8.3, Dia.=4′, DC=4, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma, no visible tail] 2020 May 23.80 UT: m1=8.0, Dia.=5.3′, DC=4, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May 21.90 UT: m1=8.3, Dia.=4,5′, DC=4, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma. No visible tail]
2020 May 20.86 UT: m1=8.1, Dia.=4,5′, DC=4, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma, slightly brighter. No visible tail]
2020 May 21.86 UT: m1=9.3, Dia.=4′, DC=3 … 20.3-cm L F/6(37x) … Marian Legutko (Gliwice, Poland)
2020 May 19.90 UT: m1=8,3, Dia.=4,5′, DC=4, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma]
2020 May 19.90 UT: m1=8,3, Dia.=4,5′, DC=4, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma]
2020 May 19.80 UT: m1=8.2, Dia.=4′, DC=4, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May 18.89 UT: m1=8.6, Dia.=4′, DC=4, no tail, … 15-cm L(30x) … Carlos Labordena (Castellón, España)
2020 May 18.87 UT: m1=8,2, Dia.=5′, DC=4, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma]
2020 May 18.07 UT: m1=8.7, Dia.=5′, DC=4, Tail= 0.2 deg. in PA: 250 deg., … 20-cm SCT(77x) … Juan Jose Gonzalez (Puerto de la Cubilla, Asturias, Spain, 42º 59′ N, 5º 54′ W, alt. 1680 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2020 May 17.86 UT: m1=8.4, Dia.=6′, DC=5/, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May 11.80 UT: m1=7.7, Dia.=5.5′, DC=5, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May 11.89 UT: m1=7.9, Dia.=5′, DC=5, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Faint coma … Significative brightening increase since last observation]
2020 May  10.85 UT: m1=8.4, Dia.=4.5′, DC=6, … 13-cm L(26x) … Alexsandr Morozov (Sukhinichi, Russia)
2020 Apr. 30.92 UT: m1=8.4, Dia.=3′, DC=4, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma … Moonlight]
2020 Apr. 30.77 UT: m1=8.4, Dia.=2′, DC=3/, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 29.78 UT: m1=8.0, Dia.=4′, DC=4, … 25-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 28.89 UT: m1=8.3, Dia.=4′, DC=4, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma]
2020 Apr. 28.14 UT: m1=9.2, Dia.=3′, DC=4, no tail, … 23.5-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 Apr. 27.86 UT: m1=8.4, Dia.=4′, DC=5, Tail= No visible tail, … 25×100 B … Jorge Rallo (Coslada-Madrid, Spain) [Very faint coma]
2020 Apr. 26.79 UT: m1=8.6, Dia.=4′, DC=4/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.42]
2020 Apr. 25.77 UT: m1=8.0, Dia.=3′, DC=4/, … 25-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 24.90 UT: m1=8.3, Dia.=3′, DC=5, Tail= No visible, … 25×100 B … Jorge Rallo (Madrid, Spain) [Very faint coma]
2020 Apr. 22.85 UT: m1=8.8, Dia.=5′, DC=5/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.59]
2020 Apr. 16.89 UT: m1=8.5, Dia.=4.2′, DC=5/, … 11.4-cm L(25x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.51]
2020 Apr. 16.16 UT: m1=7.9, Dia.=11′, DC=2, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 15.17 UT: m1=7.9, Dia.=13′, DC=1, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Apr. 14.89 UT: m1=8.3, Dia.=6′, DC=5/, … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.77]
2020 Apr. 11.78 UT: m1=8.1, Dia.=5′, DC=5/, Tail=10 arcmin. in PA 150 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [metod M, Lm=6.49]
2020 Apr. 10.75 UT: m1=8.8, Dia.=3′, DC=5, Tail=3′ in PA: 140 deg., … 25-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Apr. 02.18 UT: m1=7.8, Dia.=12′, DC=1, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Mar. 31.75 UT: m1=8.8, Dia.=4.5′, DC=5/, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Moon 43%]
2020 Mar. 24.77 UT: m1=8.5, Dia.=4′, DC=6, Tail=7 arcmin. in PA: 160 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.54]
2020 Mar. 21.44 UT: m1=8.8, Dia.=4.0′, DC=4/, … 40.0-cm L f/4.5(36x) … Seiichi Yoshida (Ibaraki, Japan)
2020 Mar. 19.66 UT: m1=9.2, Dia.=4.3′, DC=5, … 10.2-cm R(40x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [method S, lm=4.2]
2020 Mar. 19.18 UT: m1=8.1, Dia.=13′, DC=1, … 20×80 B … C. S. Morris (Fillmore, CA, U.S.A.)
2020 Mar. 18.81 UT: m1=8.9, Dia.=4.5′, DC=4/, … 12.0-cm R f/5(30x) … Maik Meyer (Linter Germany)
2020 Mar. 15.75 UT: m1=9.1, Dia.=5.5′, DC=5/, … 25.4-cm L (48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.35]
2020 Mar. 14.86 UT: m1=8.7, Dia.=3′, DC=5, … 25×100 B … 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]
2020 Mar. 14.85 UT: m1=8.9, Dia.=4′, DC=4, … 15-cm L(30x) … Carlos Labordena (Castellón, España)
2020 Mar. 13.73 UT: m1=9.1, Dia.=2.8′, DC=4/, Tail=3.5′ in PA: 120 deg., … 25-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Mar. 12.73 UT: m1=9.0, Dia.=3′, DC=4, Tail=4′ in PA: 120 deg., … 25-cm L F:4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Mar. 12.66 UT: m1=9.1, Dia.=4.0′, DC=5, … 10.2-cm R(40x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [method S, lm=4.5]
2020 Mar. 02.75 UT: m1=9.0, Dia.=4′, DC=4, … 25×100 B … Martin Lehky (Czech Republic)
2020 Feb. 28.85 UT: m1=9.0, Dia.=4′, DC=4, … 25×100 B … Martin Lehky (Czech Republic)
2020 Feb. 28.73 UT: m1=9.0, Dia.=4′, DC=5, Tail=7 arcmin. in PA: 120 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.30]
2020 Feb. 25.70 UT: m1=9.2, Dia.=2′, DC=5, Tail=4′ in PA: 102 deg., … 25-cm L F:4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Feb. 23.86 UT: m1=9.1, Dia.=3.5′, DC=5, Tail=5 arcmin. in PA: 115 deg., … 25.4-cm L(30x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.41]
2020 Feb. 22.92 UT: m1:9.3, Dia.=3.5′, DC=3, … 20×80 B, Valentín Díaz (Cancarix, Albacete, España)
2020 Feb. 21.84 UT: m1=8.9, Dia.=3.5′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Feb. 19.95 UT: m1=9.2, Dia.=4′, DC=4, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2020 Feb. 19.73 UT: m1=9.4, Dia.=4′, DC=5, Tail=7 arcmin. in PA: 108 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.35]
2020 Feb. 18.70 UT: m1=9.0, Dia.=2.3′, DC=5, Tail=1.5′ in PA: 110 deg., … 25-cm L F:4.7(42x, 70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Feb. 17.70 UT: m1=9.1, Dia.=2.8′, DC=5, … 25-cm L F:4.7(42x,70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Feb. 15.69 UT: m1=9.5, Dia=2.5’, DC=5, … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.30]
2020 Feb. 14.83 UT: m1=9.0, Dia.=3′, DC=4, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España) [no tail]
2020 Feb. 14.79 UT: m1=9.0, Dia.=4′, DC=4, … 25×100 B … Martin Lehky (Czech Republic)
2020 Feb. 13.72 UT: m1=9.3, Dia.=2.3′, DC=4/, … 25-cm L F:4.7(42x,70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Feb. 12.75 UT: m1=9.0, Dia.=4′, DC=3/, … 25×100 B … Martin Lehky (Czech Republic)
2020 Feb. 12.65 UT: m1=9.6, Dia.=2.8′, DC=5, … 10.2-cm R(40x) … Andrey Semenyuta (Pavlodar, Kazakhstan) [method S, lm=4.2]
2020 Feb. 05.74 UT: m1=9.2, Dia.=3.5′, DC=3/, … 25×100 B … Martin Lehky (Czech Republic)
2020 Feb. 05.05 UT: m1=9.8, Dia.=2’, DC=4/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2020 Feb. 03.14 UT: m1=8.9, Dia.=4′, DC=3/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Cordal de Neda – Abadín, Lugo, Spain, 43º 21′ N, 7º 27′ W, alt. 780 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2020 Jan. 31.85 UT: m1=9.2, Dia.=3′, DC=4, Tail=4 arcmin., … 23.5-cm SCT(94x) … Carlos Labordena (Castellón, España)
2020 Jan. 31.41 UT: m1=9.0, Dia.=5.5′, DC=6, … 40.0-cm L f/4.5(36x) … Seiichi Yoshida (Ibaraki, Japan)
2020 Jan. 29.78 UT: m1=9.4, Dia.=2.5′, DC=4, Tail= 0.04 arcmin. in PA: 130 deg., … 25.4-cm L f/5(64x) … Maik Meyer (Linter, Germany)
2020 Jan. 28.78 UT: m1=9.5, Dia.=3′, DC=4, … 25.4-cm L f/5(64x) … Maik Meyer (Linter, Germany)
2020 Jan. 26.86 UT: m1=9.0, Dia.=4′, DC=4, … 8-cm B(11x) … Carlos Labordena (Castellón, España) [no tail]
2020 Jan. 26.85 UT: m1=9.1, Dia.=3.5′, DC=4, Tail=4 arcmin., … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Jan. 26.83 UT: m1=9.3, Dia.=3′, DC=5, Tail=1.5 arcmin. in AP: 110 deg., … 12.7-cm L(45x) … Valentín Díaz (La Romaneta, Alicante, España)
2020 Jan. 25.68 UT: m1=9.2, Dia.=2.5′, DC=5, Tail=3.5 arcmin. in PA: 120 deg., … 25-cm L F:5(42x,70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Jan. 23.69 UT: m1=9.9, Dia.=1.5′, DC=6, Tail=2 arcmin. in PA: 130 deg., … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.54]
2020 Jan. 16.68 UT: m1=9.5, Dia.=2′, DC=3/, Tail=3.5′ in PA: 120 deg., … 25-cm L F:5(42x,70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 Jan. 15.68 UT: m1=9.7, Dia.=3′, DC=6, Tail=8 arcmin. in PA: 130 deg., … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method M, green zone]
2020 Jan. 14.89 UT: m1=8.8, Dia.=4′, DC=4, … 8-cm B(11x) … Carlos Labordena (Castellón, España)
2020 Jan. 14.88 UT: m1=9.0, Dia.=3.5′, DC=5, Tail=4 arcmin., … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Jan. 05.12 UT: m1=9.6, Dia.=4′, DC=4/, … 20-cm SCT(100x) … Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54′ N, 5º 49′ W, alt. 1490 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2020 Jan 03.95 UT: m1=9.8, Dia.=4′, DC=6, Tail=10 arcmin. in PA: 150 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Novozybkov, Russia) [method M, green zone]
2020 Jan. 01.64 UT: m1=9.9, Dia.=1.5′, DC=5/, Tail=3.5 arcmin. in PA: 145 deg., … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia) [method M, moon 35%]

C/2017 K2 (PANSTARRS)
2020 Aug. 25.04 UT: m1=14.6, Dia.=0.3′, DC=6, … 20-cm SCT(200x) … Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain, 43º 10′ N, 5º 54′ W, alt. 1221 m) [Nearby field stars checked in DSS. In-focus method. Tycho-2 comparison stars. SQM: 21.2]

289P/Blanpain
2020 Jan. 31.80 UT: m1=[14.7, … 40.0-cm L f/4.5(257x) … Seiichi Yoshida (Ibaraki, Japan)

246P/NEAT 
2020 Apr. 24.43 UT: m1=15.0, Dia.=0.4’, DC=5/, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Small opaque inner coma, diffuse outer coma, faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Apr. 22.43 UT: m1=14.7, Dia.=0.9’, DC=4, … 40-cm L f:4(182x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque inner coma, sometimes appears faintly stellar at centre in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Apr. 19.43 UT: m1=14.8, Dia.=0.6’, DC=5/, … 40-cm L(182x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small opaque centre, faint pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 20.68 UT: m1=15.3, Dia.=0.3’, DC=5/, … 40-cm L f:4.5(182x) … Chris Wyatt (Walcha, NSW, Australia) [Very small coma, opaque inner coma, sometimes appears faintly stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

210P/Christensen
2020 May  10.35 UT: m1=12.9, Dia.=1.1’, DC=3, … 25-cm L f:5(125x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitiude= 12.5°. Difficult, diffuse with slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

162P/Siding Spring
2020 Aug. 26.74 UT: m1=15.3, Dia.=0.2’, DC=5/, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in periods of good seeing, close to star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

114P/Wiseman-Skiff
2020 Jan. 31.43 UT: m1=14.0, Dia.=0.5′, DC=4, … 40.0-cm L f/4.5(257x) … Seiichi Yoshida (Ibaraki, Japan)

88P/Howell
2020 Sep. 21.41 UT: m1=8.8, Dia.=2.5′, DC=2, … 40.0-cm L f/4.5(75x) … Seiichi Yoshida (Ibaraki, Japan)
2020 Sep. 11.82 UT: m1=9.0, Dia.=3′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Sep. 08.42 UT: m1=8.9, Dia.=4.5’, DC=5, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Star on edge of coma, opaque centre well condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Sep. 07.85 UT: m1=8.7, 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: 8 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2020 Sep. 07.42 UT: m1=8.9, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Enhanced using Swan Band filter]
2020 Sep. 06.95 UT: m1=9.2, Dia.=3.5′, DC=4, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Sep. 05.83 UT: m1=9.4, Dia.=2′, DC=2, … 20-cm SCT(57x) … Carlos Labordena (Castellón, España)
2020 Aug. 24.41 UT: m1=9.6, Dia.=4’, DC=3/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, 35% illuminated Moon 6° away to the North approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Aug. 15.86 UT: m1=9.7, Dia.=5′, DC=3, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 Aug. 13.88 UT: m1=9.4, Dia.=7′, DC=2, … 20-cm SCT(77x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Altitude: 11 deg. End of astronomical twilight. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2020 Aug. 08.98 UT: m1=10.3, Dia.=3′, DC=4, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 05.37 UT: m1=10.4, Dia.=3.8’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque centre. Observed 10 mins after local Moon rise. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 30.37 UT: m1=10.3, Dia.=4’, DC=2/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Very diffuse and extended coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 July 24.91 UT: m1=10.1, Dia.=3.5′, DC=2/, … 20-cm SCT(100x) … Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55′ N, 5º 48′ W, alt. 1720 m) [Altitude: 15 deg. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2020 July 23.39 UT: m1=10.3:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 July 21.35 UT: m1=10.2, Dia.=4.6’, DC=4, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 July 19.38 UT: m1=11.4, Dia.=2.9’, DC= 3/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 July 12.98 UT: m1=11.2, Dia.=2′, DC=3/, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 07.35 UT: m1=11.4, Dia.=4.3’, DC=2, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse and transparent. Slightly opaque in centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 June 20.98 UT: m1=11.6, Dia.=2′, DC=3, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 June 20.94 UT: m1=10.7, 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: 20.9]
2020 June 20.89 UT: m1=11.7, Dia.=2′, DC=2, no tail, … 20-cm SCT(80x) … Carlos Labordena (Castellón, España)
2020 June 17.35 UT: m1=11.8, Dia.=4’, DC=3, … 25cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, slightly brighter but weakly condensed centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 June 16.37 UT: m1=11.7, Dia.=3’, DC=3, … 25cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, weakly condensed and opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 June 11.35 UT: m1=11.9, Dia.=3’, DC=3, … 25-cm L f:5(74x) … 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]
2020 May  23.80 UT: m1=12.8, Dia.=1′, DC=3, … 25.4-cm L F/4.7(70.5x) … Danil Sidorko (Korenovsk, Russia)
2020 May  17.84 UT: m1=12.7, Dia.=1.5′, DC=2/, … 25.4-cm L(120x) … Alexsandr Morozov (Novozybkov, Russia)
2020 May  10.39 UT: m1=13.6, Dia.=0.8’, DC=3, … 25-cm L f:5(125x) … Chris Wyatt (Walcha, NSW, Australia) [Difficult due to proximity to a 11.2 mag star. Diffuse outer coma with slightly brighter centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 24.42 UT: m1=14.2, Dia.=1.2’, DC=4, … 40-cm L f:4(182x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, m,oderately condensed centre, sometimes appears faintly stellar at centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Apr. 22.43 UT: m1=14.3, Dia.=1’, DC=5/, … 40-cm L f:4(182x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small inner coma with faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Apr. 19.42 UT: m1=14.8, Dia.=0.4’, DC=5/, … 40-cm L(261x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, slightly brighter centre. Sometimes appears faintly stellar at centre in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2020 Mar. 20.66 UT: m1=15.4, Dia.=0.4’, DC=3/, … 40-cm L f:4.5(182x) … Chris Wyatt (Walcha, NSW, Australia) [Small diffuse outer coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]

58P/Jackson-Neujmin
2020 Aug. 25.15 UT: m1=10.9, Dia.=3.5′, DC=1/, … 20-cm SCT(77x) … Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain, 43º 10′ N, 5º 54′ W, alt. 1221 m) [Altitude: 23 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2020 July 25.14 UT: m1=10.3, 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) [Wide and diffuse outer coma. Altitude: 13 deg. Astronomical twilight. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2020 July 19.77 UT: m1=11.4, Dia.=2.4’, DC=4, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Diffuse, brightening gradually to centre. Does not enhance in Swan Band filter. Altitude = 17.6°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 June 21.77 UT: m1=10.9, Dia.=2.6’, DC=3/, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 12.7°. Diffuse with weakly condensed and opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 May  31.36 UT: m1=10.2, Dia.=2.5, DC=2/, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 May  03.35 UT: m1=10.1 (S), Dia.=3′, DC=3, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Apr. 28.79 UT: m1=10.4, Dia.=3.4’, DC=4, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Altitude was 19.5° in twilight (8 mins after the beginning of Astro twilight) and Zodiacal light. Very diffuse, centre enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 Apr. 25.78 UT: m1=10.6, Dia.=2.6’, DC=3/, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Coma shows an opaque diffuse centre fading to semi-transparent edge, enhances in Swan Band filter. Low altitude = 17.0°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Apr. 24.77 UT: m1=10.7, Dia.=2.5’, DC=3/, … 25-cm L f:5(74x) … Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre. Enhances only slightly using Swan Band filter. Low altitude= 11.7° and in Zodiacal light. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]

29P/Schwassmann-Wachmann 1 
2020 Sep. 22.89 UT: m1=13.1, Dia.=1′, DC=2/, … 25.4-cm L(240x) … Alexsandr Morozov (Novozybkov, Russia)
2020 Sep. 13.06 UT: m1=13.9, Dia.=1′, DC=5, … 25-cm L(225x) … Valentín Díaz (La Puebla de Don Fadrique, Granada, España) [SQML: 21.35, MALI:14.6, limit conditions]
2020 Sep. 09.93 UT: m1=11.0:, 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) [Faint and diffuse outer coma, remnant of previous outbursts. Nearby field stars checked in DSS. Mag. 12.6 (AQ) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 Aug. 26.78 UT: m1=13.5, Dia.=1’, DC=2, … 40-cm L f:4(182x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse smudge, difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 Aug. 25.01 UT: m1=10.8, Dia.=5′, DC=2, … 20-cm SCT(100x) … Juan Jose Gonzalez (Collado del Fresno – Aramo, Asturias, Spain, 43º 10′ N, 5º 54′ W, alt. 1221 m) [Faint and diffuse outer coma diameter 5′, providing m1=10.8 (100x). Brighter inner coma diameter 3′, providing m=11.5 (133x). Nearby field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2020 Aug. 24.73 UT: m1=13.0, Dia.=1.2’, DC=2/, … 25-cm L f:5(125x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2020 July 19.77 UT: m1=[14.6, Dia.=–, DC=–, … 25-cm L f:5(125x) … 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]
2020 June 21.78 UT: m1=[14.4, Dia.=–, DC=–, … 25-cm L f:5(125x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 16.0°. Not visible, fainter than mag 14.4 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2020 Feb. 19.82 UT: m1=11.3, Dia.=1.5′, DC=4, … 20-cm SCT(133x) … Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46′ N, 5º 53′ W, alt. 1190 m) [Zodiacal light. In evolution after the recent outburst. Sidgwick method. Tycho-2 comparison stars. SQM: 20.4]

2P/Encke
2020 Aug. 08.97 UT: m1=10.9, Dia.=2′, DC=2, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 Aug. 05.36 UT: m1=10.5, Dia.=6.5’, DC=2/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 July 30.36 UT: m1=10.2, Dia.=4.6’, DC=2/, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Very diffuse and weakly condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2020 July 27.92 UT: m1=9.0, Dia.=1′, DC=7, … 9-cm R f/5.5(34x) … Willian Souza (Sao Paulo, Brazil)
2020 July 23.92 UT: m1=9.2, Dia.=4′, DC=3, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2020 July 23.36 UT: m1=9.6:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 July 21.92 UT: m1=8.9, Dia.=4′, DC=3/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 21.34 UT: m1=9.2, Dia.=4.3’, DC=4, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Diffuse, moderately condensed centre; Twilight. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 19.92 UT: m1=8.6, Dia.=3′, DC=3/, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 19.37 UT: m1=9.3:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 July 19.35 UT: m1=8.8, Dia.=5.5’, DC=4, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Very diffuse outer coma, moderately condensed centre. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 17.92 UT: m1=8.6, Dia.=3′, DC=4, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 17.36 UT: m1=8.7; DC=7, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Larger and more diffuse than earlier]
2020 July 15.37 UT: m1=8.5:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia)
2020 July 13.35 UT: m1=8.4:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Moderately enhanced through Swan Band Filter)
2020 July 10.92 UT: m1=7.9, Dia.=2.5′, DC=6, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2020 July 08.35 UT: m1=7.7:, … 25×100 B … David A. J. Seargent (Cowra, NSW, Australia) [Resembled an out-of-focus star. Enhanced through Swan Band Filter]
2020 July 08.89 UT: m1=7.7, Dia.=1′,DC=7, … 15×70 B … Willian Souza (Sao Paulo, Brazil)
2020 July 07.91 UT: m1=7.6*, Dia.=3′, DC=7, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, sun altitude: -12°, comet altitude: 14°, atmospheric extinction applied with average table]
2020 July 07.35 UT: m1=7.8, Dia.=3.4’, DC=6, … 15×70 B … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 6.8°, appears like a hazy star. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 07.34 UT: m1=7.8, Dia.=2.1’, DC=6, … 25-cm Lf:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.9°, Twilight. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 July 05.91 UT: m1=7.5*, Dia.=3′, DC=7, … 20×100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight. Sun altitude: -12°, comet altitude: 12°, atmospheric extinction applied with average table, full moon altitude: 4° on the east horizon]
2020 June 30.341 UT: m1=7.3, Dia.=0.5’, DC=8, … 25-cm L f:5(40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Twilight; Low altitude= 4.3°, Sun altitude= -14.4°. Small and aqua blue in colour, enhances strongly in Swan Band filter. Star-like pseudo-nucleus surrounded by a thin hazy coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2020 June 29.335 UT: m1=7.5, Dia.=0.8’, DC=8, … 25-cm L f:5 (40x) … Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Twilight, Low altitude= 4.7°, Sun altitude= -12.9°. Highly condensed, star-like pseudo-nucleus with thin hazy edge of the coma. First found when comet was at 7.2° altitude. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]


Dto. Publicaciones SECCION COMETAS LIADA
“Desde 1958 – Semper Observandum”
cometas.liada [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 que la 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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