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RECIENTES OBSERVACIONES VISUALES & CCD / RECENT COMET OBSERVATIONS
(actualizada al 13 de Mayo de 2022 / Updated 2022, May 13 – cometas.liada [AT] gmail.com).
Nueva Coordinación / Section coordinators: Alberto Anunziato (Argentina) – Pedro Ignacio Deaza Rincón (Colombia).

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NEWS: C/2022 E3 (ZTF), C/2021 P4 (ATLAS), C/2021 O3 (PanSTARRS) -debris field-, C/2021 E3 (ZTF), C/2020 Y2 (ATLAS), C/2020 R7 (ATLAS), C/2020 M5 (ATLAS), C/2020 K1 (PanSTARRS), C/2020 H6 (ATLAS), C/2019 U5 (PanSTARRS), C/2019 T4 (ATLAS), C/2019 L3 (ATLAS), C/2017 K2 (PanSTARRS), 117P/Helin-Roman-Alu, 116P/Wild 4, 104P/Kowal 2, 22P/Kopff, 19P/Borrelly, 9P/Tempel 2

C/2022 E3 (ZTF)
2022 May  07.99 UT: m1=15.0 CCD, Dia.=0.19', DC=8/, ... 0.41-m f/4.5 reflector+CCD ... Sergey Shurpakov (Baran', Belarus)
2022 Apr. 30.02 UT: m1=15.5 CCD, Dia.=0.14', DC=8/, ... 0.41-m f/3.9 reflector + CCD ... Sergey Shurpakov (Baran', Belarus)
P/2021 Q5 (ATLAS)
2021 Oct. 07.19 UT: m1=11.8, Dia.=4', DC=1/, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Wide and faint coma. Altitude: 34 deg. Field stars checked in DSS. Motion followed for 100 min. Limiting stellar magnitude near comet: 14.0 (HS). Zodiacal light. Mountain location, very clear sky. Sidgwick method. APASS comparison stars. SQM: 20.8]
2021 Sep. 19.80 UT: m1=13.5, Dia.=1.2', DC=1, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Sep. 17.14 UT: m1=11.6, Dia.=4', DC=1/ ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Las Retuertas - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1350 m) [Wide and faint coma. Altitude: 20 deg. Field stars checked in DSS. Motion followed for 90 min. Limiting stellar magnitude near comet: 13.7 (HS) at 166x. Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2021 Sep. 07.78 UT: m1=[15.5, Dia.=--, DC=--, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than mag 15.5 star in-focus. Altitude = 19.2°. Visual limiting magnitude= 15.5. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2021 Sep. 05.19 UT: m1=11.5, Dia.=4', DC=1/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Brighter than expected. Wide and faint coma. Altitude: 35 deg. Field stars checked in DSS. Comet close to the ephemeris position given in NEOCP-PCCP. Motion followed for 85 min. Limiting stellar magnitude near comet:13.4 (GSC). Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
C/2021 P4 (ATLAS)
2022 May  04.89 UT: m1=10.3, Dia.=5', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Camposagrado - Cuadros, León, Spain, 42º 42' N, 5º 41' W, alt. 1080 m) [Wide and faint outer coma. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2022 Apr. 29.95 UT: m1=14.5 CCD, Dia.=0.14', DC=8 , Tail 0.7' in PA=7 deg, ... 0.41-m f/3.9 reflector + CCD ... Sergey Shurpakov (Baran', Belarus)  
2022 Apr. 27.80 UT: m1=12.7, Dia.=1.5', DC=2/, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Gomel, RB)
2022 Apr. 28.88 UT: m1=10.5, Dia.=4', DC=3, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Cueto Rosales, León, Spain, 42º 46' N, 6º 02' W, alt. 1420 m) [Wide and faint outer coma. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
C/2021 O3 (PanSTARRS) -debris field-
2022 May  09.82 UT: m1=[9.6, Dia.=--, DC=--, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Gomel, RB) [Moon 48%]
2022 May  01.063 UT: m1=[6.9, Dia.=--, DC=--, ... 20.3-cm SCT(80x) ... Walter Webb (Millwood Lake Arkansas, USA, 33⁰6682 N 94⁰.3730W) [Began observing at 01:30 UT. Scanned comets predicted position until area set in horizon muck. No sighting]
2022 Apr. 27.083 UT: m1=[7.0, Dia.=--, DC=--, ... 15x70 B... Walter Webb (Ashdown,  Arkansas, USA) [Began observations at 0200UT. White Liffs, Arkansas 33.766135⁰ +94.05958. Used 7 magnitude star in Hyades. Observed plotted position of comet from twilight till position was only a degree above horizon. Area was still in twilight.  No sighting of comet. Wil Tirion Sky Atlas 2000.0]
2022 Apr. 19.36 UT: m1=[7.6, Dia.=--, DC=--, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Started my observation at 19.32 UT, I located a mag 7.6 star 1.28° away in P.A. 185° from the comets plotted position and panned to the field, I followed this field for about 25 minutes. No sighting of the comet, fainter than a mag 7.6 star in-focus and slightly defocussed. Difficult conditions, bright twilight from scattered sunlight on volcanic ash in the upper atmosphere hampered detection. Followed the field from 6.0° altitude to 0.6° altitude when obscured by trees on the local horizon. Limiting magnitude about 8.5 at the end of observation time, Sun altitude -15.8°. Thin cloud band present at the start time of my observation but cleared over a period of about 10 minutes. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= I, Cat= TK]
C/2021 F1 (Lemmon-PANSTARRS)
2022 Mar. 23.83 UT: m1=8.6, Dia.=7', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Pico Cañón - Pimiango, Asturias, Spain, 43º 23' N, 4º 31' W, alt. 200 m) [Altitude: 10 deg. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.3]
2022 Mar. 04.83 UT: m1=9.7, Dia.=5', 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: 20.7]
2022 Feb. 22.84 UT: m1=12.4, Dia.=0.8', DC=2, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2022 Feb. 19.84 UT: m1=10.3, Dia.=5', 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: 20.7]
2022 Feb. 06.24 UT: m1=11.2, Dia.=4', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1530 m) [Brighter than expected. Faint outer coma. Motion followed for 3.5 hours. Nearby field stars checked in DSS. Limiting star magnitude near comet: 14.0: (AQ). Mountain location, very clear sky. Sidgwick method. APASS comparison stars]
C/2021 E3 (ZTF)
2022 May  06.72 UT: m1=9.8, Dia.=5.2’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, semi-transparent coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 30.31 UT: m1=11.4, Dia.=1', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
C/2021 D1 (SWAN)
2021 Apr. 05.83 UT: m1=9.2, 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: 19 deg. Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Mar. 15.83 UT: m1=9.2, 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) [Observation made under better conditions, providing a wider coma diameter and brighter m1 estimate in comparison with my previous Mar. 12.83 observation. Altitude: 14 deg. Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Mar. 12.83 UT: m1=9.7, Dia.=5', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Altitude: 11 deg. Zodiacal light. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
C/2021 A7 (NEOWISE)
2021 Apr. 12.45 UT: m1=15.6, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, very diffuse coma. Sometimes appears to have a faint stellar pseudo-nucleus in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2021 A4 (NEOWISE)
2021 Apr. 12.40 UT: m1=14.9, Dia.=0.5’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Visible in periods of good seeing. Altitude= 17.0°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 12.85 UT: m1=11.7, Dia.=1.5', DC=3/, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
P/2021 A3 (STEREO) = P/2016 J3
2021 Jan. 16.78 UT: m1=9.7, Dia.=5', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Motion checked during a 25-min period. Altitude: 13 deg. Mountain location, very clear sky down to the horizon. Sidgwick method. Tycho-2 comparison stars. SQM: 19.6]
C/2021 A2 (NEOWISE)
2021 Feb. 07.50 UT: m1=10.3, Dia.=5', ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Somewhat enhanced through Swan Band filter]
2021 Feb. 06.85 UT: m1=10.4, Dia.=5', 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: 21.1]
2021 Feb. 06.79 UT: m1=11.0, Dia.=2', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Feb. 06.17 UT: m1=10.5, Dia.=3', DC=2/, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Feb. 02.46 UT: m1=10.3:, Dia.=3.5’, DC=4, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain due to busy star field. Coma very extended and transparent. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Jan. 25.69 UT: m1=11.0, Dia.=7’, DC=4, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 23.21 UT: m1=10.8, Dia.=3', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Jan. 13.50 UT: m1=11.4, Dia.=1.5’, DC=2/, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, observed in a region devoid of stars, coma may be a little larger. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Jan. 11.49 UT: m1=13.0, Dia.=1.2’, DC=2/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult due to diffuseness of the coma against a busy star field and poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
We adopted the upper envelope of the domain defined by visual observations as the visual light curve of the comet. Ferrin (2005) y Sosa – Fernández (2009).
C/2021 A1 (Leonard)
2022 Feb. 23.39 UT: m1=10.5 CCD, Dia.=2.8', ... 135mm f/2 lens+ CCD ... Martin Masek (Paranal, Chile) [no coma]
2022 Jan. 28.43 UT: m1=8.5, Dia.=1.9’, DC=4, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 3.5°. Faint tail visible, traced to 9’ in length in P.A. 112° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 23.95 UT: m1=7.5, Dia.=3', DC=5, ... 10x50 B ... Willian Souza (Pauba, SP, Brazil)
2022 Jan. 22.46 UT: m1=7,0, Tail=~0.25 degree, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Comet at low elevation. Coma small and ill-defined. Tail quite dense, giving comet the appearance of a nebulous streak]
2022 Jan. 21.97 UT: m1=7.5*, Dia.=4', DC=4, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 9°]
2022 Jan. 13.45 UT: m1=6.8, Dia.=5.6’, DC=5/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Faint tail visible, traced to 1.3° in P.A. 103° approximately. Tail is semi-opaque for the first 20’ in length and fading gradually to its extremity. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 08.48 UT: m1=5.3, Tail=~2 degrees, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2022 Jan. 08.44 UT: m1=5.6, Dia.=7.5’, DC=6, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight, Faint tail visible, traced to 1.3° in P.A. 097° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 04.47 UT: m1=4.7:, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2022 Jan. 04.03 UT: m1=5.0, Dia.=8', DC=6, ... 15x70 B ... Mariano Ribas (BuenosAires, Argentina)
2022 Jan. 03.44 UT: m1=4.9, Dia.=23’, DC=5/, ... Naked eye ... Chris Wyatt (Walcha, NSW, Australia) [Visible naked eye, 1° of tail length observed in P.A. 098° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 03.44 UT: m1=5.4, Dia.=6’, DC=5/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 5° in P.A. 098° approximately. Enhances well in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 02.46 UT: m1=4.8, Dia.=20’, DC=5/, ... Naked Eye ... Chris Wyatt (Walcha, NSW, Australia) [Visible naked eye, 1° of tail length observed in P.A. 094° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 02.45 UT: m1=5.1, Dia.=7’, DC=6/, ... 15x70 B [Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 2.2° in P.A. 094° approximately. The first degree or so of tail is opaque and fading gradually. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 02.01 UT: m1=4.0, Dia.=8', DC=8, Tail=2 deg. in PA:93 deg., ... 7x50 B ... A. Gonzalo Vargas (Cochabamba Bolivia)
2022 Jan. 01.97 UT: m1=4.8, Dia.=8', DC=7, Tail=1.5 deg. in PA:95 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2022 Jan. 01.48 UT: m1=4.3, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2022 Jan. 01.48 UT: m1=--, Dia.=--', DC=--, Tail=6 deg. ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2022 Jan. 01.45 UT: m1=4.6, Dia.=20’, DC=5/, ... Naked eye .... Chris Wyatt (Walcha, NSW, Australia) [Visible naked eye, 1.2° of tail length observed in PA 095° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 01.45 UT: m1=4.7, Dia.=7’, DC=6/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 3.6° in P.A. 095° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 31.98 UT: m1=4.9, Dia.=7', DC=6, Tail=2.4 deg., ... 20x80 B ... Roger Jiménez (Barquisimeto, Lara, Venezuela, 10° 04' N 69° 19' W, 606 msnm) [Altitude: 17 deg. Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 31.97 UT: m1=5.0, Dia.=8', DC=6, Tail=1.5 deg. in PA:95 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 31.47 UT: m1=4.5, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 31.44 UT: m1=4.6, Dia.=20’, DC=5/, ... Naked eye ... Chris Wyatt (Walcha, NSW, Australia) [Visible naked eye, 1 degree of tail length observed, PA 092° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 31.44 UT: m1=4.9, Dia.=6.5’, DC=6, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 3.2° in P.A. 092° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 30.98 UT: m1=4.8, Dia.=8', DC=6, Tail=2 deg. in PA:95 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 30.76 UT: m1=4.8, Dia.=6', DC=7, ... 25x100 B ... Juan Jose Gonzalez (Gamoniteiro - Sierra del Aramo, Asturias, Spain, 43º 11' N, 5º 55' W, alt. 1760 m) [Altitude: 3 deg. Astronomical twilight. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 30.48 UT: m1=4.3, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 30.44 UT: m1=4.5, Dia.=20’, DC=5/, ... Naked eye ... Chris Wyatt (Walcha, NSW, Australia) [Easily visible naked eye, 1 degree of tail length observed, PA 090° approximately. Best compared with Eta Indi. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 30.44 UT: m1=4.8, Dia.=8’, DC=6/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Comet in outburst. Faint tail visible, traced to 2.4° in P.A. 090° approximately. Disk-like inner coma with bright central condensation. Enhances in Swan Band filter. Coma appears more circular than parabolic in shape from previous observations. Through my 10” f/5 dob at x40 I could see some smooth ‘jet-like’ features within the coma either side of the pseudo-nucleus radiating slightly forward and behind the pseudo-nucleus and perpendicular to the tail axis and almost the same diameter as the coma. It was best viewed with averted vision. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dic. 29.75 UT: m1=5.2, Dia.=4', DC=7, Tail=50 arcmin., ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2021 Dec. 29.47 UT: m1=4.8, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 29.44 UT: m1=4.8, Dia.=17’, DC=3/, ... Naked eye ... Chris Wyatt (Walcha, NSW, Australia) [Faintly visible naked eye, and 1 degree of tail length observed, PA 090° approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 29.44 UT: m1=5.3, Dia.=7’, DC=6, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 8.5° in P.A. 090° approximately. A knot was observed as a large irregular diffuse patch about 4.7° from the coma, the tail was traced to Upsilon Pisces Austrini where it was about 1.2° in width and lost in the glare of bright stars. Coma and part of the tail enhanced in Swan Band filter. Altitude= 18.8°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 28.47 UT: m1=4.3, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 28.44 UT: m1=4.5, Dia.=10’, DC=6, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 9° in length in P.A. 090° approximately. Altitude= 18.8°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 27.98 UT: m1=4.4, Dia.=8', DC=6/, Tail=2.5 deg. in PA:95 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Atmospheric polution]
2021 Dec. 27.98 UT: m1=4.8, Dia.=8', DC=7, Tail=0.5 deg. in PA:90 deg., ... 9-cm R(28x) ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 27.98 UT: m1=5.0, Dia.=4', DC=6, Tail=1 deg., ... 20x80 B ... Roger Jiménez (Barquisimeto, Lara, Venezuela, 10° 04' N 69° 19' W, 606 msnm) [Altitude: 20 deg. Sidgwick method. Tycho-2 comparison stars. Soft haze in the comet observation area]
2021 Dec. 27.97 UT: m1=4.7, Dia.=8', DC=7, Tail=0.5 deg in PA:90 deg., ... 9-cm R(16x) ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 27.96 UT: m1=4.6, Dia.=10', DC=7, Tail=0.2 deg. in PA:90 deg., ... 10x42 B ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 27.47 UT: m1=4.1, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 26.98 UT: m1=4.0, Dia.=8', DC=6, ... 7x50 B ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 26.97 UT: m1=4.2, Dia.=10', DC=7, Tail=0.2 deg. in PA:90 deg., ... 15x70 B ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 26.97 UT: m1=3.7, Dia.=--, DC=8 ... Naked eye ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 26.97 UT: m1=3.8, Dia.=8', DC=7, Tail=2.5 deg. in PA:90 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 26.97 UT: m1=4.2, Dia.=10', DC=7, Tail=0.2 deg. in PA:90 deg., ... 15x70 B ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 26.48 UT: m1=4.2, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia) [Tail 3.5 degrees in 15x80 binocular. Some thin high cloud]
2021 Dec. 26.03 UT: m1=4.1, Dia.=10', DC=7, Tail=4.5 deg. in PA:90 deg., ... 15x70 B ... Mariano Ribas (Lima, Pcia. Buenos Aires, Argentina) [Comet altitude: 18°, Sun altitude: -17°]
2021 Dec. 25.97 UT: m1=3.8, Dia.=--, DC= 8, ... Naked eye ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 25.97 UT: m1=4.0, Dia.=10', DC=7, Tail=3 deg. in PA:90 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 25.48 UT: m1=4.1, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 25.48 UT: m1=--, Dia.=--', DC=--, Tail=5.5 deg. in PA=90 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Central condensatin less starlike. Tail visible NE, possibly glimpsed to 7 degrees with averted vision}
2021 Dec. 25.44 UT: m1=4.3, Dia.=10.7’, DC=5/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 2.6° in P.A. 088° approximately. Altitude = 18.5°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 25.43 UT: m1=3.7, Dia.=20’, DC=4, ... Naked eye .... Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Appears as a fuzzy spot with almost stellar centre. Faint tail visible, traced to 1.5° in length in P.A. 090° approximately. Altitude= 20.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 24.97 UT: m1=3.6, Dia.=--, DC=8, ... Naked eye ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2021 Dec. 24.97 UT: m1=3.7, Dia.=12', DC=7, Tail=2.5 deg. in PA:95 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2021 Dec. 24.47 UT: m1=3.4, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia) [Comet clearly in outburst]
2021 Dec. 24.47 UT: m1=--, Dia.=16, DC=7, Tail=3.0 deg. in PA=86 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 24.02 UT: m1=3.2, Dia.=8', DC=7, Tail=1 arcmin., ... 8x40 B ... Aldo Agustin Paredes Romero (Mexico City, Mexico) [Comet altitude: 15°, Sun altitude: -15°]
2021 Dec. 23.47 UT: m1=4.3, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 23.47 UT: m1=--, Dia.=--', DC=--, Tail=2.7 deg. in PA=83 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 23.44 UT: m1=5.0, Dia.=8’, DC=6, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 2.5° in P.A. 090° approximately. Differential atmospheric extinction corrections applied using Summer table Ic of Green. Altitude= 16.3°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 23.43 UT: m1=4.6, Dia.=20’, DC=4, ... 0.0E ... Chris Wyatt (Walcha, NSW, Australia) [Naked eye. Appears as a fuzzy spot with almost stellar centre. Differential atmospheric extinction corrections applied using Summer table Ic of Green. Altitude= 18.8°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 23.03 UT: m1=4.2, Dia.=10', DC=7, Tail=1.2 deg. in PA:90 deg., ... 15x70 B ... Mariano Ribas (Gorchs, Pcia. Buenos Aires, Argentina) [Comet altitude: 16°, Sun altitude: -17°]
2021 Dec. 22.97 UT: m1=4.5, Dia.=8', DC=6, Tail=60 arcmin. in PA:95 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 21°, Sun altitude: -15°]
2021 Dec. 22.75 UT: m1=4.5, Dia.=6', DC=7, Tail=0.6 deg. in PA:80 deg, ... 25x100 B ... Juan Jose Gonzalez (Sierra de Fario, Asturias, Spain, 43º 26' N, 5º 35' W, alt. 730 m) [Altitude: 5 deg. Start of evening astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 19.2]
2021 Dec. 21.97 UT: m1=4.0*, Dia.= --, DC=7 ... Naked eye ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 20°, Sun altitude: -15°, atmospheric extinction Table ICQ Ia applied]
2021 Dec. 21.97 UT: m1=4.1, Dia.=10', DC=6/, Tail=75 arcmin. in PA:90 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 20°, Sun altitude: -15°]
2021 Dec. 21.96 UT: m1=5.0*, Dia.=10', DC=5, Tail=0.2 deg. in PA:90 deg., ... 15x70 B ... Willian Souza (Sao Paulo, Brazil) [High clouds interference]
2021 Dec. 21.45 UT: m1=3.2, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 21.45 UT: m1=--, Dia.=--', DC=--, Tail=4.2 deg. in PA=90 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Coma very slightly fainter through Swan Band filter. Tail spectacular in 25x100B, brighter portion glimpsed naked eye]
2021 Dec. 20.97 UT: m1=2.8, Dia.=--, DC=8, ... Naked eye ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 18°, Sun altitude: -15°, atmospheric extinction Table ICQ Ia applied]
2021 Dec. 20.97 UT: m1=3.0, Dia.=12', DC=7, Tail=2.0° in PA:90 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 18°, Sun altitude: -15°, atmospheric extinction Table ICQ Ia applied]
2021 Dec. 20.93 UT: m1=3.0*, Dia.=10', DC=8, Tail=0.2 deg. in PA:90 deg., ... 15x70 B ... Willian Souza (Sao Paulo, Brazil, Brazil)
2021 Dec. 20.45 UT: m1=3.3, ... Naked eye ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 20.45 UT: m1=--, Dia.=8', DC=8, Tail=1.3 deg. in PA=90 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 20.43 UT: m1=3.6, Dia.=5’, DC=8, ... 10x50 R ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 14.4°, Az= 244°. Faint tail visible, traced to 30’ in length in P.A. 080° approximately. Sun altitude= -15.7°, Az= 229°. Moon Altitude= 2.7°, Az= 056°. Differential atmospheric extinction corrections applied using Summer table. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= B, Cat= TK]
2021 Dec. 19.96 UT: m1=4.6, Dia.=7', DC=6, Tail=1.5° in PA:90 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2021 Dec. 19.44 UT: m1=4.6, Tail=0.5 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Somewhat enhanced through Swan Band filter]
2021 Dec. 19.08 UT: m1=3.9, Dia.=10', DC=5, ... 16x70 B ... Charles S. Morris (Fillmore, CA, USA) [comet significantly brighter, comet was at ~8 deg. elevation, compared with a 4.48 and 4.54 stars, short tail visible]
2021 Dec. 19.033 UT: m1=4.6, Día.=7', DC=5, ... 20x50 B ... Luis Mansilla (Rosario, Argentina) [Urban sky. Alture: 7° 41'. Star comparation: Omega Sagittarii 4.7]
2021 Dec. 18.96 UT: m1=4.4, Dia.=7', DC=6, Tail=1.5° in PA:90 deg., ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2021 Dec. 18.08 UT: m1=4.2, Dia.=10', DC=5, ... 16x70 B ... Charles S. Morris (Fillmore, CA, USA) [comet was at ~8 deg. elevation, compared with a 4.59 star nearly the same elevation]
2021 Dec. 17.75 UT: m1=4.3, Dia.=5', DC=7, ... 10x50 B ... Juan Jose Gonzalez (Gamoniteiro - Sierra del Aramo, Asturias, Spain, 43º 11' N, 5º 55' W, alt. 1760 m) [Altitude: 6 deg. Start of evening astronomical twilight. Moonlight interference (phase 0.98). Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 17.3]
2021 Dec. 17.43 UT: m1=3.6, Dia.=14’, DC=3, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Extremely low altitude= 2.0°, Moonlight interference. Sun altitude= -16.6°. Appears as a faint smudge. Differential atmospheric extinction corrections applied using Summer table Ic by Green. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2021 Dec. 17.01 UT: m1=4.3, ...	17.5-cm	A(6x) ... Sergio Babino - Pablo Piriz (Rosario, Dto. Colonia, Uruguay)
2021 Dec. 17.004 UT: m1=[3.7, ... 20x50 B ... Luis Mansilla (Rosario, Argentina) [in nautical twilight, altitude: 7 deg.]
2021 Dec. 16.96 UT: m1=3.1:, Dia.=7', DC=6/, ... 7x50 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Many clouds, comet altitude: 6°, atmospheric extinction applied table Ic ICQ]
2021 Dec. 16.75 UT: m1=3.4, Dia.=7', DC=6, ... 10x50 B ... Juan Jose Gonzalez (Gamoniteiro - Sierra del Aramo, Asturias, Spain, 43º 11' N, 5º 55' W, alt. 1760 m) [In 25x100B: 0.4-deg tail in p.a. 70 deg. Altitude: 5 deg. Start of evening astronomical twilight. Moonlight interference (phase 0.95). Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 15.75 UT: m1=3.3, Dia.=7', DC=6/, ... 10x50 B ... Juan Jose Gonzalez (Sierra de Tineo, Asturias, Spain, 43º 22' N, 6º 23' W, alt. 1040 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 17.3. Altitude: 4 deg. Possible outburst. Near-stellar central condensation. Comparison stars near the same low altitude as the comet. Start of evening astronomical twilight. Mountain location. Some thin high clouds. Moonlight interference (phase 0.90)]
2021 Dec. 12.23 UT: m1=5.1, Dia.=8', DC=5, Tail=30', ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2021 Dec. 11.25 UT: m1=4.7, Dia.=12', DC=7, ... naked eye ... Juan Jose Gonzalez (Mora - Sierra del Castillo de Peñas Negras, Toledo, Spain, 39º 41' N, 3º 44' W, alt. 905 m) [In 10x50B: m1=4.9, Dia.=16', DC=6/, Tail=1.7 deg. in PA:330 deg. Naked eye: In-focus method. Tycho-2 comparison stars. SQM: 20.3]
2021 Dec. 08.56 UT: m1=5.4, Dia.=16', DC=4, ... 10x50 B ... Charles S. Morris (Fillmore, CA, USA)
2021 Dec. 08.24 UT: m1=5.9, Dia.=10', DC=5/, Tail=20' in PA:320 deg., ... 20x80 B ... Valentín Díaz (Elche ciudad, España) [contaminación lumínica]
2021 Dec. 06.56 UT: m1=5.6, Dia.=17', DC=3, ... 10x50 B ... Charles S. Morris (Fillmore, CA, USA)
2021 Dec. 06.01 UT: m1=6.3, Dia.=4', DC=4, Tail=25', ... 5-cm B(10x) ... Carlos Labordena (Ari, Maldivas)
2021 Dec. 05.56 UT: m1=5.8, Dia.=17', DC=2/, ... 10x50 B ... Charles S. Morris (Fillmore, CA, USA)
2021 Dec. 04.18 UT: m1=6.7, Dia.=5', DC=5, Tail=30' in PA:318 deg., ... 20x80 B ... Valentín Díaz (La Romaneta, Alicante, España) [Tail con dobson 25 cm, SQML en zona del cometa 20.20]
2021 Dec. 03.25 UT: m1=6.4, Dia.=12', DC=5, Tail=2.4 deg. in PA:310 deg, ... 10x50 B ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Dec. 03.20 UT: m1=7.1, Dia.=5', DC=4, Tail=50' in PA:320 deg., ... 20x80 B ... Valentín Díaz (Elche ciudad, España) [contaminacion luminica]
2021 Dec. 03.01 UT: m1=6.5, Dia.=4', DC=4, Tail=17', ... 5-cm B(10x) ... Carlos Labordena (Ari, Maldivas)
2021 Dec. 02.02UT: m1=6.6, Dia.=10', DC=4/, Tail=20 arcmin. in PA:320deg., … 20x60 B … Alexsandr Morozov(Novozybkov, Russia)
2021 Dec. 01.01 UT: m1=6.7, Dia.=4', DC=4, Tail=12', ... 5-cm B(10x) ... Carlos Labordena (Ari, Maldivas)
2021 Nov. 28.12 UT: m1=7.7, Dia.=5', DC=3, ... 20x80 B ... Valentín Díaz (Elche ciudad, España) [contaminación lumínica e interferencia lunar]
2021 Nov. 18.24 UT: m1=7.9, Dia.=8', DC=3, Tail=0.15 deg. in PA:320 deg., … 25x100 B … Juan Jose Gonzalez (Llano de las Ovejas - Sierra del Teleno, 1950 m, Leon, Spain, 42º 22' N, 6º 27' W, alt. 1950 m) [Beginning of astronomical twilight. Some moonlight interference. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.0]
2021 Nov. 16.08 UT: m1=8.7, Dia.=5.5', DC=5, Tail=4 arcmin. in PA: 300 deg., … 25.4-cm L(48x) …Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 11.22 UT: m1=8.7, Dia.=8', DC=3, Tail=0.4 deg. in PA:320 deg., ... 25x100 B ... Juan Jose Gonzalez (Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias, Spain, 43º 17' N, 4º 59' W, alt. 1120 m) [In 20 cm SCT (77x): m1=9.2, Dia.=6', DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Nov. 11.04 UT: m1=8.9, Dia.=8', DC=5, Tail=4' in PA:310 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 05.23 UT: m1=9.7, Dia.=5', DC=3/, Tail=0.3 deg. in PA: 330 deg., ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2021 Nov. 04.20 UT: m1=10.6, Dia.=3', DC=4, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Nov. 04.06 UT: m1=10.7, Dia.=4', DC=3/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 01.01 UT: m1=10.9, Dia.=3', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 16.08 UT: m1=11.8, Dia.=3.5', DC=2, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 07.20 UT: m1=11.2, 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) [Brighter than expected. Wide and faint outer coma. Altitude: 25 deg. Field stars checked in DSS. Limiting stellar magnitude near comet: 14.0 (AQ). Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Oct. 05.04 UT: m1=[12.5, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
C/2020 Y2 (ATLAS)
2022 May  06.47 UT: m1=14.9, Dia.=0.5’, DC=5, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  03.42 UT: m1=14.8, Dia.=0.6’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  02.39 UT: m1=14.8, Dia.=0.5’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Small round coma, faint stellar pseudo-nucleus visible in good seeing periods. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 20.37 UT: m1=15.0, Dia.=0.5’, DC=3, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 05.44 UT: m1=14.4, Dia.=0.6’, DC=5/6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 04.47 UT: m1=14.6, Dia.=0.7’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque centre, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 22.39 UT: m1=14.1, Dia.=0.7’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 21.39 UT: m1=14.4, Dia.=0.7’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Small and diffuse, poor seeing, close to mag 12.4 star but easy to see. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Dec. 14.70 UT: m1=15.1, Dia.=0.3’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
We adopted the upper envelope of the domain defined by visual observations as the visual light curve of the comet. Ferrin (2005) y Sosa – Fernández (2009). Helio Magnitude versus Days from T. – C/2020 T2 (Palomar) 2021 Oct. 25.4, Ho:2.4, n:8.0, T:+21 days.
C/2020 T2 (Palomar)
2021 Oct. 25.41 UT: m1=13.4, Dia.=0.6’, DC=5, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre, crowded star field. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 04.78 UT: m1=11.4, Dia.=1', DC=3, ... 20-cm SCT(117x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Sep. 19.41 UT: m1=10.4, Dia.=1.4', DC=3/, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Sep. 08.42 UT: m1=10.9, Dia.=3.7’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, opaque inner coma, stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 06.40 UT: m1=10.9, Dia.=3.9’, DC=5, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Background star in coma. Opaque centre, no enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 04.84 UT: m1=10.2, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2021 Aug. 31.42 UT: m1=10.7, Dia.=3.7’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre. Faint stellar pseudo-nucleus. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.42 UT: m1=10.9, Dia.=4.8’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter, faint stars in coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 13.53 UT: m1=10.9, Dia.=4.4’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 10.6°; Diffuse outer coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 10.89 UT: m1=9.8, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Aug. 10.39 UT: m1=10.7, Dia.=3.9’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus, opaque inner coma fading to semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 08.97 UT: m1=10.8, Dia.=3.0', DC=6, ... 9-cm R(34x) ... Willian Souza (Praia do Pauba-SP, Brazil)
2021 Aug. 07.98 UT: m1=10.7, Dia.=3.0', DC=6, ... 9-cm-R(50x) ... Willian Souza (Praia do Pauba-SP, Brazil)
2021 Aug. 06.89 UT: m1=11.1, Dia.=2.5', DC=3, ... 30-cm L(79x) ... Valentín Díaz (Almansa, Albacete, España)
2021 Aug. 06.45 UT: m1=10.6, Dia.=4.5’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Hint of faint tail to the ESE approximately. Stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 05.90 UT: m1=9.7, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 Aug. 05.87 UT: m1=10.8, Dia.=2.5', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 July 31.48 UT: m1=10.4, Dia.=4’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Hint of tail to the ESE. Stellar pseudo-nucleus, opaque inner coma, extended outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.44 UT: m1=10.6, Dia.=4’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Centre dims in Swan Filter, inner coma enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 July 29.39 UT: m1=10.4, Dia.=6’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 July 27.91 UT: m1=9.9, Dia.=6', DC=3/, ... 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]
2021 July 27.40 UT: m1=10.4, Dia.=5’, DC=5, ... 25-cm L f:5 (40x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter, no tail visible. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 July 22.49 UT: m1=10.2, Dia.=1.4', DC=3/, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 July 13.94 UT: m1=9.8, Dia.=6', DC=3/, ... 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: 21.3]
2021 July 12.40 UT: m1=10.5, Dia.=4.5’, DC=6, ... 40-cm L f:4(x59x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible (m2 13.4 approximately), opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 09.89 UT: m1=10.3, Dia.=4', DC=3, ... 20-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2021 July 09.86 UT: m1=10.7, Dia=2.5', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 July 08.94 UT: m1=9.7, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2021 July 05.86 UT: m1=10.3, Dia.=4', DC=3, ... 20-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2021 July 05.43 UT: m1=10.5, Dia=4.2’, DC=5/, ... 40-cm L f:4 (59x) ... Chris Wyatt (Walcha, NSW, Australia) [Inner coma dims in Swan Band while outer coma enhances slightly. Hint of faint tail to the East approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 July 04.96 UT: m1=9.8, Dia.=6', DC=3/, ... 20 cm SCT (77x) ... Juan Jose Gonzalez (La Camperona, Leon, Spain, 42º 51' N, 5º 12' W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM, 21.3]
2021 July 04.36 UT: m1=10.4, Dia.=3.8’, DC=5/6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Sometimes appears faintly stellar in good seeing. Star on NW edge of coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 30.90 UT: m1=10.5, Dia.=2.8', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 30.38 UT: m1=10.5, Dia.=3.8’, DC=5, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 June 29.73 UT: m1=[10.0, ... 10.2-cm R(50x) ... Andrey Semenyuta (Pavlodar, Kazakhstan)
2021 June 28.90 UT: m1=10.4, Dia.=4', DC=3, ... 20-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2021 June 27.96 UT: m1=9.5, Dia.=6', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 June 27.34 UT: m1=10.5, Dia.=3.8’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 18.92 UT: m1=10.9, Dia=2.5', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 15.46 UT: m1=10.6, Dia.=4’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus, opaque centre. Faint broad tail visible, traced to 8’ in length in P.A. 118° approximately. Coma dims in Swan Band filter, with the centre still visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 15.08 UT: m1=10.3, Dia.=3', DC=3/, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 June 13.92 UT: m1=10.3, Dia=3.5', DC=4/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 12.91 UT: m1=10.5, Dia.=5', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 June 09.96 UT: m1=9.9, 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: 21.5]
2021 June 07.95 UT: m1=10.3, Dia.=3', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 06.45 UT: m1=10.2, Dia.=4', ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 June 06.37 UT: m1=10.3, Dia.=4.3’, DC=6', ... 40-cm L f:4(x59) ... Chris Wyatt (Walcha, NSW, Australia) [Coma centre enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 June 04.96 UT: m1=10.0, Dia.=5', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2021 June 01.88 UT: m1=10.7, Dia.=6', DC=3/, ... 25.4-cm L(48x) ... Alexsandr Morozov(Novozybkov, Russia)
2021 May  31.44 UT: m1=10.4, ...25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 May  31.37 UT: m1=10.5, Dia.=5.6’, DC=6, ... 40-cm L f:4(x59) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, fading to semi-opaque outer coma. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  28.90 UT: m1=10.7, Dia.=3', DC=4, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 May  19.62 UT: m1=11.1, Dia.=3.5’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to stars. Opaque inner coma, semi-transparent outer coma. Low altitude =13.8°. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  17.47 UT: m1=10.9, Dia.=6’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, opaque inner coma fading to edges. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  15.93 UT: m1=10.5, Dia.=3.5', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  13.41 UT: m1=10.7, Dia.=7’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  12.43 UT: m1=10.6, Dia.=3.5’, DC=5/, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma centre opaque, diffuse outer coma. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  11.91 UT: m1=10.7, Dia.=4', DC=2,... 15-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2021 May  10.95 UT: m1=11.2, Dia.=2', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkqv, Russia)
2021 May  05.92 UT: m1=10.8, Dia.=4', DC=2, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 May  04.81 UT: m1=11.8, Dia.=2', DC=3/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  03.90 UT: m1=9.8, Dia.=7', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de Olleros de Alba, Leon, Spain, 42º 48' N, 5º 43' W, alt. 1210 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2021 Apr. 30.80 UT: m1=11.5, Dia.=2', DC=3, ... 25.4-cm L F/4.7(70.5x) ... Danil Sidorko (Korenovsk, Russia)
2021 Apr. 28.81 UT: m1=12.0, Dia=2', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 19.67 UT: m1=12.3, Dia.=2.8’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, Altitude= 17.6°. Stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 18.96 UT: m1=11.9, Dia.=2', DC=4/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 13.68 UT: m1=12.5, Dia.=2.6’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre fading to edges. No enhancement in Swan Band filter. Altitude= 19.3°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 12.67 UT: m1=12.2, Dia.=2.7’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, semi-transparent outer coma. Stellar centre in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Abr. 12.14 UT: m1=11.3, Dia.=2', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Apr. 11.17 UT: m1=11.9, Dia.=1.5', DC=4, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Apr. 11.04 UT: m1=11.7, Dia=1.6', DC=4, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 05.90 UT: m1=10.4, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2021 Apr. 05.05 UT: m1=11.2, Dia.=1.7', DC=4/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Mar. 25.70 UT: m1=12.8, Dia.=1.5’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [No tail, faint stellar pseudo-nucleus, opaque centre, fading to edges. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 24.66 UT: m1=12.5, Dia.=1.8’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter; Close to star. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 24.08 UT: m1=12.0, Dia.=1.5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Mar. 22.15 UT: m1=10.5, Dia.=7', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1570 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.7]
2021 Mar. 15.90 UT: m1=10.7, Dia.=6', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [From dark mountain skies the comet shows a large and very diffuse outer coma, Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
C/2020 R7 (ATLAS)
2022 May  06.73 UT: m1=13.9, Dia.=0.6’, DC=5/6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible in good seeing, diffuse coma, close to star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2020 R4 (ATLAS)
2021 June 09.94 UT: m1=11.5, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 June 06.39 UT: m1=14.0, Dia.=1.3’, DC=3/', ... 40-cm L f:4(x108) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slight brightening to centre. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 04.94 UT: m1=11.7, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 May  17.48 UT: m1=12.4, Dia.=3.5’, DC=2, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, weak brightening at centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 May  15.92 UT: m1=10.8, Dia.=5', DC=2, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  13.42 UT: m1=11.6, Dia.=3.8’, DC=3, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter, very diffuse, appears slightly elongated to the East approximately. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 May  12.51 UT: m1=10.1, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 May  11.89 UT: m1=10.1, Dia.=4', DC=3,... 15-cm SCT(30x) ... Carlos Labordena (Castellón, España)
2021 May  10.96 UT: m1=10.5, Dia.=5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  09.44 UT: m1=9.8, Dia.=4, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Slight enhancement using Swna Band filter]
2021 May  08.92 UT: m1=10.5, Dia.=8', DC=2/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  08.08 UT: m1=9.6, Dia.=8', DC=3/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1221 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 May  05.91 UT: m1=9.0, Dia.=6', DC=2,... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2021 May  05.90 UT: m1=9.3, Dia.=4', DC=3,... 20-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2021 May  04.82 UT: m1=8.9, Dia.=9', DC=4/, ... 25.4-cm L(30x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  03.92 UT: m1=8.3, Dia.=10', DC=3/, ... 25x100 B ... Juan Jose Gonzalez (Collada de Olleros de Alba, Leon, Spain, 42º 48' N, 5º 43' W, alt. 1210 m) [In 20 cm SCT (77x): m1=9.4, Dia.=7', DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2021 May  02.52 UT: m1=9.2, Dia.=6, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Apr. 30.77 UT: m1=9.1, Dia.=5.5', DC=4, ... 25.4-cm L F/4.7(70.5x) ... Danil Sidorko (Korenovsk, Russia)
2021 Apr. 28.80 UT: m1=9.0, Dia=7', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 21.24 UT: m1=9.2, Dia.=8', DC=2/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Apr. 19.71 UT: m1=9.9, Dia.=4.4’, DC=4, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Faint background stars in coma. Outer coma extended. Semi-transparent inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Apr. 18.97 UT: m1=9.0, Dia.=7', DC=2/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 17.03 UT: m1=7.7, Dia.=15', DC=3/, ... 10x50 B ... Juan Jose Gonzalez (Alto del Torno - Sierra Benzua, 43º 24' N, 4º 59' W, alt. 533 m) [In 25x100B: m1=7.8, Dia.=15', DC=3. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.5]
2021 Apr. 13.70 UT: m1=10.4, Dia.=3.9’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, faint stars in coma. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Apr. 12.69 UT: m1=10.3, Dia.=5.5’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma large and transparent. Faint opaque extension within coma to the West approximately. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Abr. 12.15 UT: m1=8.9, Dia.=6', DC=3, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2021 Apr. 12.12 UT: m1=7.9, Dia.=12', DC=3/, ... 25x100 B ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1270 m) [Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 Apr. 12.02 UT: m1=9.4, Dia.=4', DC=2, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 11.31 UT: m1= 9.0, Dia.=8', DC=2, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Apr. 11.30 UT: m1= 9.1, Dia.=7', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Apr. 10.33 UT: m1=9.0, Dia.=8', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Apr. 06.15 UT: m1=8.1, Dia.=10', DC=3/, ... 25x100 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [In 20-cm SCT(77x): m1=8.5, Dia.=7', DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Apr. 05.07 UT: m1=9.8, Dia.=4', DC=2, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 03.31 UT: m1=10.0, Dia.=4', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2021 Mar. 25.75 UT: m1=9.3, Dia.=3.4’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, well condensed. Semi-transparent outer coma. Faint hint of tail to the West approximately, about 3’ in length. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Mar. 24.71 UT: m1=9.5, Dia.=3.5’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band filter, Small stellar pseudo-nucleus visible, opaque centre fading to edges. Altitude= 19.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Mar. 24.09 UT: m1=10.4, Dia.=1.1', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Mar. 22.20 UT: m1=8.3, Dia.=8', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1570 m) [Altitude: 20 deg. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2021 Mar. 21.33 UT: m1=10.1, Dia.=3.5', DC=2, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Mar. 17.19 UT: m1=9.6, Dia.=3', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Mar. 13.21 UT: m1=8.4, 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) [Altitude: 12 deg. Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Jan. 07.77 UT: m1=9.5, Dia.=4', DC=3, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Altitude: 7 deg. Very clear sky down to the horizon. Sidgwick method. Tycho-2 comparison stars. SQM: 20.2]
C/2020 PV6 (PanSTARRS)
2021 Sep. 08.42 UT: m1=14.6, Dia.=0.9’, DC=4/5, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 04.91 UT: m1=13.3, Dia.=1.5', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Field stars checked in DSS. Motion followed for 60 min. Limiting stellar magnitude near comet: 14.8 (APASS). Sidgwick method. APASS comparison stars. SQM: 21.3]
2021 Aug. 31.41 UT: m1=14.8, Dia.=0.3’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Transparent coma, stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.41 UT: m1=14.6, Dia.=0.4’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, inner coma opaque, faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 13.54 UT: m1=14.7, Dia.=0.6’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 14.1°; Opaque centre, faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 10.40 UT: m1=14.6, Dia.=0.4’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, close to star but resolvable. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.46 UT: m1=14.9, Dia.=0.5’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.46 UT: m1=14.7, Dia.=0.5’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.41 UT: m1=14.6, Dia.=0.5’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult due to poor seeing at altitude 21.1°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2020 M5 (ATLAS)
2022 May  03.44 UT: m1=15.4, Dia.=0.3’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  02.41 UT: m1=15.4, Dia.=0.3’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse with opaque centre. Close to 16.2 mag star that was visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 05.44 UT: m1=15.1, Dia.=0.5’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 04.50 UT: m1=15.2, Dia.=0.5’, DC=4/, … 40-cm L f:4(261x) … Chris Wyatt (Walcha, NSW, Australia) [Visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2020 M3 (ATLAS)
2021 Feb. 06.91 UT: m1=10.8, Dia.=4', DC=2, ... 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: 21.4]
2021 Jan. 16.85 UT: m1=10.5, Dia.=4', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Jan. 13.83 UT: m1=10.3, Dia.=5', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Jan. 13.80 UT: m1=11.0, Dia.=3', DC=2, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Jan. 07.89 UT: m1=10.5, Dia.=5', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
C/2020 K1 (PanSTARRS)
2022 May  06.71 UT: m1=14.3, Dia.=0.3’, DC=4/5, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, small coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 30.04 UT: m1=14.5 CCD, Dia.=0.22', DC=3/, ... 0.41-m f/3.9 reflector + CCD ... Sergey Shurpakov (Baran', Belarus)
C/2020 J1 (SONEAR)
2022 Apr. 05.45 UT: m1=14.9, Dia.=0.5’, DC=3, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 15.5°, Visible in good seeing periods. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Feb. 09.75 UT: m1=14.1, Dia.=1.3’, DC=3, ... 25-cm L f:5(179x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Sep. 08.40 UT: m1=13.8, Dia.=1’, DC=3/4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 12.2°, Zodiacal light and glare from Venus interference. Difficult due to scintillation. Faint stellar pseudo-nucleus visible at times. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 31.40 UT: m1=13.8, Dia.=1’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.39 UT: m1=13.6, Dia.=1.3’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Zodiacal light interference. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 10.88 UT: m1=11.4, Dia.=3.5', DC=2, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Aug. 10.38 UT: m1=14.3, Dia.=0.5’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to bright star but resolvable. Opaque outer coma, stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.44 UT: m1=13.2, Dia.=1.5’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque inner coma, extended and transparent outer coma, faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 05.89 UT: m1=11.2, Dia.=5', DC=1/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 July 30.45 UT: m1=13.8, Dia.=0.9’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.40 UT: m1=13.8, Dia.=1’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse transparent outer coma, faint stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 27.90 UT: m1=11.3, Dia.=4', DC=1/, ... 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: 21.0]
2021 July 13.93 UT: m1=11.1, Dia.=4', DC=2, ... 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: 21.1]
2021 July 12.41 UT: m1=13.4, Dia.=1’, DC=6, ... 40-cm L f:4(x108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible at centre, opaque inner coma, transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 08.92 UT: m1=11.2, Dia.=4', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 July 05.50 UT: m1=13.9, Dia=0.6’, DC=6, ... 40-cm L f:4 (182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 July 04.95 UT: m1=11.2, Dia.=5', DC=2/, ... 20 cm SCT (77x) ... Juan Jose Gonzalez (La Camperona, Leon, Spain, 42º 51' N, 5º 12' W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM, 21.2]
2021 July 04.37 UT: m1=13.9, Dia.=1.3’, DC=4, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque coma, hint of elongation to the East approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 30.39 UT: m1=13.7, Dia.=1’, DC=4/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, small opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 27.35 UT: m1=13.6, Dia.=0.8’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 15.48 UT: m1=13.6, Dia.=1.8’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 15.12 UT: m1=12.3, Dia.=1.5', DC=5, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 June 09.97 UT: m1=11.6, Dia.=5', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 June 06.38 UT: m1=13.1, Dia.=2.0’, DC=6', ... 40-cm L f:4(x59) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 04.98 UT: m1=11.6, 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]
2021 May  31.40 UT: m1=12.9, Dia.=1.1’, DC=6, ... 40-cm L f:4(x108) ... Chris Wyatt (Walcha, NSW, Australia) [Coma appears elongated to the East approximately, stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  19.58 UT: m1=12.6, Dia.=1.8’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, semi-transparent outer coma. Appears to be elongated to the East approximately. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  17.50 UT: m1=13.0, Dia.=1.5’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  13.45 UT: m1=12.9, Dia.=1’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter, opaque centre with faint pseudo-nucleus visible in good seeing, semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 19.68 UT: m1=12.9, Dia.=0.7’, DC=4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with opaque centre. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 13.69 UT: m1=13.3, Dia.=0.9’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Sometimes shows faint stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Apr. 12.67 UT: m1=13.2, Dia.=0.6’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus, opaque outer coma. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 25.74 UT: m1=13.4, Dia.=0.4’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible, outer coma semi-opaque. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 24.70 UT: m1=13.3, Dia.=0.5’, DC=5, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2020 H6 (ATLAS)
2022 May 07.90 UT: m1=16.1 CCD, Dia.=0.24', DC=7/, Tail=1.20' in PA:227 deg., ... 0.41-m f/4.5 reflector+CCD ... Sergey Shurpakov (Baran', Belarus)
C/2020 F5 (MASTER)
2021 Oct. 25.46 UT: m1=14.9, Dia.=0.7’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse outer coma, faint stellar pseudo-nucleus visible in good seeing periods. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 09.63 UT: m1=14.7, Dia.=0.7’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 06.46 UT: m1=14.5, Dia.=1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible, diffuse outer coma. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 11.69 UT: m1=14.8, Dia.=0.4’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to 13.7 mag star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 08.46 UT: m1=14.7, Dia.=0.7’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, diffuse and transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 07.68 UT: m1=14.6, Dia.=0.4’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to mag 15.5 star but resolvable, coma opaque at centre with faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 31.44 UT: m1=14.8, Dia.=1’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus, semi-opaque coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.45 UT: m1=14.7, Dia.=0.5’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 10.43 UT: m1=14.4, Dia.=0.7’, DC=4/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.48 UT: m1=14.7, Dia.=0.7’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque inner coma, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 31.50 UT: m1=14.7, Dia.=0.5’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque centre pale-aqua blue in colour. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.50 UT: m1=14.9, Dia.=0.6’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre. Faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.46 UT: m1=15.1, Dia.=0.6’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, faint stellar pseudo-nucleus visible in good seeing. Altitude= 19.7°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 12.75 UT: m1=14.9, Dia.=0.5’, DC=6, ... 40-cm L f:4(x261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with opaque centre, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 06.72 UT: m1=14.9, Dia=0.5’, DC=6, ... 40-cm L f:4 (182x) ... Chris Wyatt (Walcha, NSW, Australia)[Diffuse, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 May  19.64 UT: m1=15.1, Dia.=0.6’, DC=3/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, Low altitude=16.6°. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 Apr. 19.73 UT: m1=15.3, Dia.=0.5’, DC=3/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult. Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 13.73 UT: m1=15.2, Dia.=0.6’, DC=4, .... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, centre opaque. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 12.75 UT: m1=15.3, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with opaque centre. Sometimes faintly stellar at centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2019 U5 (PanSTARRS)
2022 May 07.89 UT: m1=14.8 CCD, Dia.=0.38', DC=6/, Tail=2.13' in PA:74 deg., ... 0.41-m f/4.5 reflector+CCD ... Sergey Shurpakov (Baran', Belarus)
2022 May  06.51 UT: m1=14.5, Dia.=0.6’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 10.9°, Diffuse coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2019 T4 (ATLAS)
2022 May  06.48 UT: m1=12.3, Dia.=2.1’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus, opaque inner coma, transparent outer. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  04.93 UT: m1=10.4, Dia.=5', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Camposagrado - Cuadros, León, Spain, 42º 42' N, 5º 41' W, alt. 1080 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2022 May  03.44 UT: m1=12.2, Dia.=2.2’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus, opaque inner coma, transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  02.40 UT: m1=12.3, Dia.=1.5’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, m2 about mag 13.9 approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 29.88 UT: m1=11.2, Dia.=2', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Apr. 24.83 UT: m1=11.9, Dia.=1.7', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Gomel, RB)
2022 Apr. 28.92 UT: m1=10.6, Dia.=4', DC=3, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Cueto Rosales, León, Spain, 42º 46' N, 6º 02' W, alt. 1420 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2022 Apr. 22.00 UT: m1=11.6, Dia.=1', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Apr. 20.37 UT: m1=11.6, Dia.=1.2’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 05.45 UT: m1=11.6, Dia.=1.2’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Star in coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 04.48 UT: m1=11.9, Dia.=1.3’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, stellar pseudo-nucleus visible, opaque inner coma, thin diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 01.91 UT: m1=10.8, Dia.=4', DC=3, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Mag. 13.0 (APASS) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2022 Mar. 22.42 UT: m1=12.3, Dia.=0.9’ DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, stellar pseudo-nucleus. Coma almost disappears using Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 21.41 UT: m1=12.2, Dia.=1.2’ DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight interference -just on Moonrise-. Stellar pseudo-nucleus, opaque inner, small outer transparent coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 07.17 UT: m1=11.8, Dia.=1', DC=5, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Feb. 09.72 UT: m1=12.7, Dia.=1’ DC= 5, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to mag 12.1 star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Feb. 07.55 UT: m1=12.5; Dia.=0.8’ DC=5/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Small coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Jan. 31.49 UT: m1=12.7, Dia.=1.2’, DC=5/, ... 25-cm L f,5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible in good seeing. Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Jan. 03.52 UT: m1=13.3, Dia.=0.9’, DC=3/, ... 25-cm L f:5(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in periods of good seeing. Low altitude= 8.1°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Jan. 02.25 UT: m1=12.5, Dia.=0.5', DC=5, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 14.71 UT: m1=13.4, Dia.=0.7’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan band filter. Close to galaxy NGC 3923 (4.6’ away in P.A. 250°). Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Dec. 03.24 UT: m1=12.1, Dia.=2.0', DC=3, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Altitude: 16 deg. Sidgwick method. APASS comparison stars. SQM: 21.0]
2021 Oct. 09.73 UT: m1=13.8, Dia.=0.5’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 13.0°. Coma diffuse and opaque, faint star in coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 12.39 UT: m1=14.6, Dia.=0.4’, DC=4/5, ... 40-cm L f:4(x182x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 13.9°, Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 05.42 UT: m1=14.4, Dia=0.5’, DC=4/, ... 40-cm L f:4 (182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.5°; Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 June 27.36 UT: m1=14.3, Dia.=0.6’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, sometimes faint pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 06.38 UT: m1=14.3, Dia.=0.5’, DC=6', ... 40-cm L f:4(x182) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  31.38 UT: m1=14.3, Dia.=0.5’, DC=5/, ... 40-cm L f:4(x182) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque coma with faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  17.47 UT: m1=13.5, Dia.=0.6’, DC=5, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult due to proximity to star in coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  13.45 UT: m1=14.4, Dia.=0.2’, DC=5, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Small with opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 30.38 UT: m1=14.5, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse and small, opaque centre that sometimes appears stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 12.44 UT: m1=14.1, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult due to bright star but coma is resolvable. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 25.68 UT: m1=14.2, Dia.=1’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint pseudo-nucleus visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2019 N1 (ATLAS)
2021 Apr. 30.36 UT: m1=14.3, Dia.=0.9’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Apr. 12.42 UT: m1=14.2, Dia.=0.8’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible in good seeing. Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 25.76 UT: m1=13.5, Dia.=1’, DC=3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 13.9°, Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 24.67 UT: m1=14.3, Dia.=0.5’, DC=3/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 14.7°, Very diffuse with slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Feb. 09.46 UT: m1=12.9, Dia.=0.8’, DC=3/, ... 25-cm L f:5(179x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult. Visible in periods of good seeing, viewing over light polluted area of town. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 25.70 UT: m1=12.8, Dia.=2’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse with an opaque centre which appears to have stellar pseudo-nucleus in periods of good seeing. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 23.27 UT: m1=11.9, Dia.=1', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)

We adopted the upper envelope of the domain defined by visual observations as the visual light curve of the comet. Ferrin (2005) y Sosa – Fernández (2009). Helio Magnitude versus Days from T. – C/2019 L3 (ATLAS) 2022 May 04.9 / Ho:0.3, n:4.88, T:+5 days

C/2019 L3 (ATLAS)
2022 May  04.90 UT: m1=9.8, Dia.=3', DC=5, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Camposagrado - Cuadros, León, Spain, 42º 42' N, 5º 41' W, alt. 1080 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.4]
2022 May  03.42 UT: m1=10.6, Dia.=2.0’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to stars, faint stellar pseudo-nucleus, opaque inner coma, transparent outer coma. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  02.37 UT: m1=10.3, Dia.=1.9’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque inner coma, faint stellar pseudo-nucleus sometimes visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 29.86 UT: m1=10.2, Dia.=2.5', DC=4, no cola, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Apr. 28.90 UT: m1=9.8, Dia.=2.5', DC=5, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Cueto Rosales, León, Spain, 42º 46' N, 6º 02' W, alt. 1420 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2022 Apr. 24.79 UT: m1=10.0, Dia.=1.8', DC=4, ... 25.4-cm L(48x) ... Alexsandr Morozov (Gomel, RB)
2022 Apr. 21.94 UT: m1=10.4, Dia.=1.5', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Apr. 20.36 UT: m1=10.5, Dia.=1.3’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 4’ in length in P.A. 132° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 05.41 UT: m1=10.2, Dia.=2.3’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 04.44 UT: m1=10.2, Dia.=3.5’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 8.7’ in P.A. 093° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 02.87 UT: m1=10.3, Dia.=2', DC=5, no tail , ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Apr. 02.87 UT: m1=10.3, Dia.=2', DC=4, ... 8-cm R(40x) ... Valentín Díaz (La Romana, Spain)
2022 Apr. 01.85 UT: m1=9.7, Dia.=2.5', DC=6, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2022 Mar. 23.86 UT: m1=9.5, Dia.=2.5', DC=6, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Pico Cañón - Pimiango, Asturias, Spain, 43º 23' N, 4º 31' W, alt. 200 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2022 Mar. 22.40 UT: m1=9.9, Dia.=2.7’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Centre enhances in Swan Band filter, faint tail visible, traced to 4.4’ in length in P.A. 128° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 21.41 UT: m1=9.7, Dia.=3.5’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight encroaching, coma appears opaque at centre, with thin outer transparent coma and stellar pseudo-nucleus. Faint short coma extension to the ESE approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 08.72 UT: m1=9.7, Dia.=&4.0', DC=3, ... 10.2-cm R(50x) ... Andrey Semenyuta (Pavlodar, Kazakhstan)
2022 Mar. 07.00 UT: m1=9.6, Dia.=3', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Mar. 04.86 UT: m1=9.5, Dia.=3', DC=6, ... 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: 21.0]
2022 Feb. 27.79 UT: m1=9.9, Dia.=1.0', DC=5, ... 30.0-cm L(189x) ... Martin Mašek (Hodkovice nad Mohelkou, Czech Republic)
2022 Feb. 22.83 UT: m1=9.6, Dia.=3', DC=5, no tail ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Feb. 22.42 UT: m1=9.8, Dia.=4.0', DC=6/, ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Ibaraki, Japan)
2022 Feb. 21.08 UT: m1=9.1, Dia.=3', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2022 Feb. 19.85 UT: m1=9.5, Dia.=3', DC=6, ... 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: 21.1]
2022 Feb. 07.53 UT: m1=9.3; Dia.=2.8’; DC=5/, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Diffuse outer coma, opaque inner coma and stellar pseudo-nucleus visible sometimes. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Feb. 05.88 UT: m1=9.3, Dia.=4', DC=6, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars]
2022 Feb. 04.77 UT: m1=9.2, Dia.=2', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2022 Jan. 31.47 UT: m1=9.6, Dia.=2.5’, DC=6, ...  25-cm L f,5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stars in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 29.95 UT: m1=9.0, Dia.=2.7', DC=6, ... 20-cm L(63x) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 28.90 UT: m1=9.2, Dia.=4', DC=5, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Jan. 28.48 UT: m1=9.4, Dia.=2.7’, DC=6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to star. Opaque centre, coma dims in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 23.04 UT: m1=9.2, Dia.=3', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Jan. 21.86 UT: m1=9.1, Dia.=4', DC=6, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2022 Jan. 14.25 UT: m1=8.8, Dia.=4', DC=6, Tail=0.2 deg. in PA:320 deg., ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1221 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2022 Jan. 06.88 UT: m1=9.4, Dia.=3', DC=5, no tail ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Jan. 06.12 UT: m1=9.3, Dia.=3', DC=4, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Jan. 03.96 UT: m1=9.3, Dia.=2.5', DC=6, ... 12.5-cm L(25X) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 03.48 UT: m1=9.3, Dia.=5’, DC=6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 11’ in length in P.A. 312° approximately. Opaque inner coma enhances, outer coma dims in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 02.17 UT: m1=9.4, Dia.=2.5', DC=5, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Jan. 01.48 UT: m1=9.6, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 30.87 UT: m1=9.3, Dia.=3', DC=6, Tail=0.2 deg. in PA:310 deg., ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 29.49 UT: m1=9.0, Dia.=3’, DC=6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 14.7°. Enhances in Swan Band filter. Faint stellar pseudo-nucleus visible, bright opaque inner coma with semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 26.12 UT: m1=9.7, Dia.=2', DC=5, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 18.66 UT: m1=9.5, Dia.=2.2', DC=6/, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Dec. 14.67 UT: m1=9.5, Dia.=3.2’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 10’ in length in P.A. 287° approximately. Inner coma enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 13.66 UT: m1=9.4, Dia.=3.5’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 9.2’ in length in P.A. 267° approximately. Inner coma enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 12.27 UT: m1=9.8, Dia.=3', DC=4/, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 11.21 UT: m1=9.4, Dia.=6', DC=6, ... 25x100 B ... Juan Jose Gonzalez (Mora - Sierra del Castillo de Peñas Negras, Toledo, Spain, 39º 41' N, 3º 44' W, alt. 905 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2021 Dec. 04.29 UT: m1=9.9, Dia.=2', DC=5, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 02.96 UT: m1=9.6, Dia.=5', DC=6, Tail=0.2 deg. in PA:300 deg, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Nov. 16.07 UT: m1=10.0, Dia.=2.5', DC=6/, …25.4-cm L(48x) …Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 15.29 UT: m1=9.9, Dia.=2', DC=4, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 13.72 UT: m1=10.2, Dia.=4’, DC=6, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 5.8’ in length in P.A. 290° approximately. Centre enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Nov. 11.13 UT: m1=9.6, Dia.=4', DC=5, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias, Spain, 43º 17' N, 4º 59' W, alt. 1120 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 Nov. 09.84 UT: m1=10.5, Dia.=2', DC=4/, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 07.038 UT: m1=10.5, Dia.=2', DC=6, ... 20-cm L(70x)... Valentín Díaz (La Romana, Alicante, España)
2021 Nov. 05.13 UT: m1=9.5, Dia.=5', DC=4/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Nov. 04.07 UT: m1=10.2, Dia.=2', DC=4, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Nov. 02.29 UT: m1=10.0, Dia.=2', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Oct. 31.98 UT: m1=10.7, Dia.=3.5', DC=5/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 27.90 UT: m1=9.6, 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: 20.8]
2021 Oct. 19.07 UT: m1=10.3, Dia.=3', DC=6, ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 09.74 UT: m1=11.1, Dia.=4’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 9.2°, Coma dims in Swan Band filter. Opaque inner coma, stellar pseudo-nucleus visible in good seeing. Faint tail traced to 3.7’ in length in P.A. 280° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 07.90 UT: m1=10.5, Dia=2.6', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 07.02 UT: m1=9.9, Dia.=4', DC=4, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Sep. 30.87 UT: m1=10.9, Dia.=2', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 05.16 UT: m1=10.8, Dia.=3', DC=5, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Sep. 19.78 UT: m1=11.0, Dia.=1.6', DC=7, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Sep. 17.12 UT: m1=10.5, Dia.=5', DC=4, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Las Retuertas - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1350 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Sep. 09.97 UT: m1=11.2, Dia.=1.5', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 05.02 UT: m1=10.7, Dia.=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. Tycho-2 comparison stars. SQM: 21.0]
2021 Sep. 03.97 UT: m1=11.2, Dia.=1.8', DC=5, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Aug. 20.98 UT: m1=11.4, Dia.=2', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 11.09 UT: m1=10.9, Dia.=4', 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. Tycho-2 comparison stars. SQM: 21.1]
2021 Aug. 08.94 UT: m1=11.5, Dia.=2', DC=3, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 06.10 UT: m1=11.3, Dia.=2.0', DC=3/, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 July 14.12 UT: m1=11.2, Dia.=2.5', 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: 21.0]
2021 July 9.09 UT: m1=11.4, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 July 06.95 UT: m1=11.9, Dia.=1.4', DC=3/ ...25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 10.10 UT: m1=11.2, 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: 20.6]
2021 June 07.94 UT: m1=12.1, Dia.=1.4', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 10.79 UT: m1=11.9, Dia.=1.2', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Apr. 05.88 UT: m1=11.3, Dia.=2.3', DC=4/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Apr. 02.79 UT: m1=11.8, Dia.=1.5', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Mar. 15.85 UT: m1=11.7, Dia.=1.5', DC=5, ... 20-m SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Mar. 09.66 UT: m1=[9.5, ... 10.2-cm R(50x) ... Andrey Semenyuta (Pavlodar, Kazakhstan) [It's too weak for a 102-mm telescope]
C/2019 F1 (ATLAS-Africano)
2021 Oct. 09.64 UT: m1=14.9, Dia.=0.5’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 06.44 UT: m1=14.8, Dia.=0.4’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Faintly stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 11.68 UT: m1=14.8, Dia.=0.7’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, sometimes faintly stellar. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 08.46 UT: m1=14.9, Dia.=0.6’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 07.71 UT: m1=14.7, Dia.=0.4’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, faint stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 31.43 UT: m1=14.8, Dia.=0.5’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.45 UT: m1=14.9, Dia.=0.5’, DC=5, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 13.56 UT: m1=15.0, Dia.=0.3’, DC=5/6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to star, opaque centre, well condensed. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 10.42 UT: m1=14.9, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, sometimes faintly stellar. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.47 UT: m1=14.9, Dia.=0.6’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, faint stellar pseudo-nucleus visible. Close to stars but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 31.51 UT: m1=14.7, Dia.=0.5’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to star, but resolvable. Windy conditions. Diffuse coma with faint stellar pseudo-nucleus sometimes visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.49 UT: m1=14.8, Dia.=0.6’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, faint stellar pseudo-nucleus visible in good seeing. Transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.45 UT: m1=14.9, Dia.=0.5’, DC=3/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 12.78 UT: m1=14.8, Dia.=0.5’, DC=6, ... 40-cm L f:4(x261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma with faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 06.70 UT: m1=14.8, Dia=0.5’, DC=4, ... 40-cm L f:4 (261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 July 05.47 UT: m1=14.9, Dia=0.3’, DC=4, ... 40-cm L f:4 (261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 June 27.37 UT: m1=14.8, Dia.=0.5’, DC=5, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slight brightening to centre, almost faintly stellar at centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 15.47 UT: m1=14.7, Dia.=0.6’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, with faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  31.41 UT: m1=14.8, Dia.=0.3’, DC=5/, ... 40-cm L f:4(x261) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, coma opaque with faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  19.61 UT: m1=14.9, Dia.=0.5’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  17.52 UT: m1=14.5, Dia.=0.7’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint outer coma, opaque inner coma, sometimes stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  13.73 UT: m1=15.1, Dia.=0.5’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, semi-transparent diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 19.77 UT: m1=14.9, Dia.=0.4’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible in good seeing, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 13.69 UT: m1=14.7, Dia.=0.6’, DC=5/, .... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma with faint stellar pseudo-nucleus in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 12.68 UT: m1=14.8, Dia.=0.5’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus, semi-transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 25.72 UT: m1=14.8, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre that appears stellar in good seeing periods. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 24.68 UT: m1=14.8, Dia.=0.3’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with small centre, sometimes stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
C/2018 U1 (Lemmon)
2021 Sep. 08.43 UT: m1=15.2, Dia.=0.3’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse. Slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 31.42 UT: m1=15.1, Dia.=0.4’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 13.55 UT: m1=15.2, Dia.=0.4’, DC=5/6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 10.41 UT: m1=15.3, Dia.=0.4’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, sometimes faintly stellar surrounded by 3 stars but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.43 UT: m1=15.3, Dia.=0.5’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, close to stars but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 31.50 UT: m1=15.0, Dia.=0.5’, DC=3/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Windy conditions. Diffuse coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.48 UT: m1=15.0, Dia.=0.5’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with faint stellar pseudo-nucleus visible in good seeing, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.44 UT: m1=15.0, Dia.=0.5’, DC=5, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Visible in good seeing. Diffuse and opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 05.48 UT: m1=15.0, Dia=0.3’, DC=5/, ... 40-cm L f:4 (261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 May  19.59 UT: m1=15.1, Dia.=0.4’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse. Stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  17.51 UT: m1=15.2, Dia.=0.3’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in good seeing periods, slight brightening to and opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  13.70 UT: m1=15.2, Dia.=0.4’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, small coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
We adopted the upper envelope of the domain defined by visual observations as the visual light curve of the comet. Ferrin (2005) y Sosa – Fernández (2009). Helio Magnitude versus Days from T. – C/2017 K2 (PANSTARRS) 2022 May 6.7, Ho:1.85, n:3.52 / linecurve in gray: Ho:4.3, n:2.72
C/2017 K2 (PANSTARRS)
2022 May  09.96 UT: m1=10.4, Dia.=2.2', DC=4/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Gomel, RB)
2022 May  07.11 UT: m1=10.2, Dia.=2', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 May  06.70 UT: m1=10.3, Dia.=2.0’, DC=5/6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Inner coma enhances in Swan Band filter, outer coma dims, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 30.27 UT: m1=10.1, Dia.=3', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Apr. 29.98 UT: m1=10.4 CCD, Dia.=0.56', DC=5/, ... 0.41-m f/3.9 reflector + CCD ... Sergey Shurpakov (Baran', Belarus)
2022 Apr. 29.02 UT: m1=10.3, Dia.=3', DC=3/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Cueto Rosales, León, Spain, 42º 46' N, 6º 02' W, alt. 1420 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2022 Apr. 24.98 UT: m1=11.1, Dia.=1', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Gomel, RB)
2022 Apr. 01.17 UT: m1=11.8, Dia.=1.5', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Feb. 22.83 UT: m1=11.7:, Dia.=1.6', DC=4, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2022 Feb. 09.79 UT: m1=11.8, Dia.=1.2’, DC=3/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to star, diffuse with opaque centre. Low altitude= 8.0°. Poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Feb. 06.25 UT: m1=10.6, Dia.=3', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars]
2022 Jan. 14.22 UT: m1=11.1, Dia.=2.5', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1221 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2021 Nov. 23.66 UT: m1=11.7, Dia.=1.8', DC=3, … 25.4-cm L(171.4x) … Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 09.66 UT: m1=11.8, Dia.=2.1', DC=2/, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 31.68 UT: m1=11.7, Dia.=2.5', DC=2/, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 27.81 UT: m1=10.8, Dia.=3', 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: 21.0]
2021 Oct. 22.68 UT: m1=11.9, Dia.=2.5', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 08.72 UT: m1=11.7, Dia.=2.5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 06.93 UT: m1=10.4, Dia.=3', DC=3, ... 20-cm SCT (100x) ... Juan Jose Gonzalez ( Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m ) [ Sidgwick method. Tycho-2 comparison stars. SQM: 21.0.].
2021 Oct. 06.40 UT: m1=12.7, Dia.=1.2’, DC=4/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude = 11.3°, Diffuse outer coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 03.73 UT: m1=12.0, Dia.=2.5', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 28.85 UT: m1=11.7, Dia.=2.2', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46' N, 5º 53' W, alt. 1190 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Sep. 27.75 UT: m1=12.1, Dia.=1.5', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 08.81 UT: m1=12.3, Dia.=1.5', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep 0.6.41 UT: m1=13.1, Dia.=1.2’, DC=4/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, close to star but resolvable. Moderately condensed centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 05.76 UT: m1=12.3, Dia.=2.5', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Sep. 04.92 UT: m1=12.2, Dia.=1.5', DC=4/, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.3]
2021 Aug. 31.40 UT: m1=13.0, Dia.=1.8’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque inner coma, semi-transparent outer coma. Pseudo-nucleus visible in good seeing. Altitude= 19.8°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.40 UT: m1=13.0, Dia.=1.4’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, Opaque inner coma, semi-transparent outer, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 19.94 UT: m1=12.1, Dia.=1.8', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 13.52 UT: m1=13.0, Dia.=1’, DC=3/4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 9.2°; Close to stars but resolvable. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 10.93 UT: m1=12.3, Dia.=1.0', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.6]
2021 Aug. 10.40 UT: m1=13.2, Dia.=1.1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 08.92 UT: m1=12.2, Dia.=2.5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 06.45 UT: m1=13.1, Dia.=1’, DC=5, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 19.9°, No enhancement in Swan Band filter, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 05.91 UT: m1=12.2, Dia.=1.5', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.5]
2021 July 31.48 UT: m1=13.2, Dia.=1’, DC=3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 18.1°, Diffuse, opaque centre, sometimes faintly stellar at centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.84 UT: m1=12.3, Dia.=1.6', DC=3/ ... 25.4-cm L(120x) ...Alexsandr Morozov (Novozybkov, Russia)
2021 July 30.45 UT: m1=13.3, Dia.=1’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 19.9°, No enhancement in Swan Band filter. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.40 UT: m1=13.2, Dia.=1.5’, DC=4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 19.1°, Dims in Swan Band filter. Diffuse outer coma, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 27.92 UT: m1=12.2, Dia.=1.0', DC=4/, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46' N, 5º 53' W, alt. 1190 m) [Sidgwick method. APASS comparison stars. SQM: 21.4]
2021 July 27.41 UT: m1=13.5, Dia.=0.8’, DC=3, ... 25-cm L f:5 (179x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 19.0°, Diffuse outer coma, slight brightening to centre. Close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 13.96 UT: m1=12.1, Dia.=1.5', 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. APASS comparison stars. SQM: 21.5]
2021 July 12.42 UT: m1=13.5, Dia.=1’, DC=5/6, ... 40-cm L f:4(x108x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 13.5°, Diffuse outer coma, opaque inner coma, sometimes appears faintly stellar at centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 08.96 UT: m1=12.2, Dia.=1.5', DC=4, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.5]
2021 July 06.92 UT: m1=12.5, Dia.=1.5', DC=4 ...25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 July 05.49 UT: m1=13.5, Dia=1’, DC=5/6, ... 40-cm L f:4 (182x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, semi-transparent outer coma. Faint stellar pseudo-nucleus visible in good seeing. Altitude= 16.5°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 July 04.98 UT: m1=12.3, Dia.=1.5', DC=4, ... 20 cm SCT (133x) ... Juan Jose Gonzalez (La Camperona, Leon, Spain, 42º 51' N, 5º 12' W, alt. 1530 m) [Sidgwick method. APASS comparison stars. SQM, 21.4]
2021 June 30.90 UT: m1=12.8, Dia.=1.1', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 15.50 UT: m1=13.5, Dia.=1.3’, DC=4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter. Low altitude = 11.0°. Opaque centre, diffused outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 13.91 UT: m1=12.7, Dia.=1', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 June 09.99 UT: m1=12.2, Dia.=1.5', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.6]
2021 June 05.00 UT: m1=12.3, Dia.=1.5', DC=4, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. APASS comparison stars. SQM: 21.3]
2021 June 01.90 UT: m1=12.7, Dia.=1.2', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 May  19.63 UT: m1=13.8, Dia.=0.8’, DC=5, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude=14.7°, Diffuse, opaque centre, almost stellar. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  13.70 UT: m1=14.0, Dia.=0.5’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slightly brighter centre. Altitude= 16.0°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 19.75 UT: m1=14.1, Dia.=0.5’, DC=3, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 17.7°. Close to star. Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Apr. 12.74 UT: m1=13.9, Dia.=0.3’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 17.2°; Close to star but resolvable. Diffuse with opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 25.76 UT: m1=14.0, Dia.=0.4’, DC=3/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 16.3°, Diffuse coma, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 24.74 UT: m1=13.9, Dia.=0.6’, DC=3/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 13.6°, Diffuse coma, slight brightening to centre which is opaque. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Mar. 21.43 UT: m1=14.2, Dia.=0.6’, DC=3/, ... 41-cm R(229x) ... Alan Hale (Cloudcroft NM, USA)
398P/Boattini = P/2020 P2
2021 Jan. 16.82 UT: m1=11.2, Dia.=4', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Jan. 13.80 UT: m1=10.8, Dia.=4', DC=2, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2021 Jan. 13.48 UT: m1=13.0, Dia.=0.6’, DC=5/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to stars. Opaque central condensation, semi-transparent outer coma. Faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 11.47 UT: m1=12.9, Dia.=0.9’, DC=5/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma small, close to stars. Stellar pseudo-nucleus visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Jan. 10.00 UT: m1=11.7, Dia.=1', DC=4, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Jan. 07.85 UT: m1=11.2, Dia.=4', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Jan. 05.45 UT: m1=12.5, Dia.=1.4’, DC=4/, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, moderately condensed centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 04.08 UT: m1=11.7, Dia.=1', DC=4/, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
284P/McNaught
2021 Sep. 11.72 UT: m1=14.7, Dia.=0.6’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre, faint stellar pseudo-nucleus visible in good seeing. Windy conditions. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
252P/LINEAR
2021 Aug. 31.39 UT: m1=14.0, Dia.=0.7’, DC=1/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, very difficult. Zodiacal light interference. Low altitude= 14.8°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 28.38 UT: m1=13.7, Dia.=0.9’, DC=1, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, very difficult. Zodiacal light interference, low altitude= 16.8°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 10.38 UT: m1=11.6, Dia.=2.3’, DC=1/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre. Weakly condensed. Altitude = 13.8°. Enhances in Swan Band filter, interference from zodiacal light and glare from Venus. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
246P/NEAT 
2021 Oct. 25.43 UT: m1=15.3, Dia.=0.5’, DC=3/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse and weakly condensed. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 06.41 UT: m1=14.9, Dia.=0.3’, DC=3, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, very diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 10.42 UT: m1=14.5, Dia.=0.5’, DC=5, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.48 UT: m1=14.4, Dia.=0.5’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.43 UT: m1=14.3, Dia.=0.6’, DC=4/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.43 UT: m1=14.1, Dia.=0.7’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible in good seeing. Outer coma transparent and extended. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 12.73 UT: m1=14.5, Dia.=0.6’, DC=5/6, ... 40-cm L f:4(x261x) ... Chris Wyatt (Walcha, NSW, Australia) [Pseudo-nucleus sometimes visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 06.70 UT: m1=13.8, Dia=0.8’, DC=4/, ... 40-cm L f:4 (182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 July 05.46 UT: m1=14.0, Dia=0.6’, DC=5, ... 40-cm L f:4 (182x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult due to proximity to background stars. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 May  19.60 UT: m1=14.3, Dia.=0.8’, DC=4/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, transparent outer coma brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  17.53 UT: m1=15.0, Dia.=0.5’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Visible in good seeing as a diffuse patch with opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  13.72 UT: m1=14.5, Dia.=0.7’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 19.70 UT: m1=14.4, Dia.=0.5’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Apr. 12.73 UT: m1=15.1, Dia.=0.4’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse and small coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
156P/Russell-LINEAR
2021 Feb. 09.42 UT: m1=12.0, Dia.=1’, DC=3/, ... 25-cm L f:5(125x) .. Chris Wyatt (Walcha, NSW, Australia) [Diffuse, low altitude= 11.9°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Feb. 06.89 UT: m1=11.0, Dia.=3', 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: 21.2]
2021 Feb. 02.44 UT: m1=12.8, Dia.=2’, DC=3/, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre, close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Feb. 01.74 UT: m1=11.5, Dia.=1.5', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Jan. 16.83 UT: m1=10.8, Dia.=3', DC=3, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Jan. 16.75 UT: m1=11.3, Dia.=2', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Jan. 13.81 UT: m1=10.6, Dia.=5', DC=3, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Jan. 13.78 UT: m1=10.8, Dia.=4', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Jan. 13.47 UT: m1=12.0, Dia.=1.7’, DC=6, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre with stellar pseudo-nucleus visible, coma appears slightly fanned to the East approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 11.45 UT: m1=12.0, Dia.=2.3’, DC=5, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Altitude= 18.0°. At x40 I can fit M33 on the western side of the field with the comet visible on the East side, (1.3° separation). Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 07.84 UT: m1=10.8, Dia.=4', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Jan. 05.44 UT: m1=11.8, Dia.=0.9’, DC=6, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 03.00 UT: m1=11.0, Dia.=2', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
141P/Machholz 2
2021 Feb. 09.44 UT: m1=13.3, Dia.=0.8’, DC=3, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Feb. 06.83 UT: m1=10.5, Dia.=5', 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]
2021 Feb. 02.45 UT: m1=11.2, Dia.=5’, DC=3, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, star on edge of coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Feb. 01.72 UT: m1=11.4, Dia.=2.5', DC=2, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Jan. 16.81 UT: m1=10.2, Dia.=4', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2021 Jan. 13.79 UT: m1=9.8, Dia.=6', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Zodiacal light. Altitude: 35 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Jan. 13.46 UT: m1=10.6, Dia.=4’, DC=3, ... 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= S, Cat= AQ]
2021 Jan. 11.44 UT: m1=10.3, Dia.=4.2’, DC=3, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, opaque centre but weakly condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Jan. 09.98 UT: m1=10.4, Dia.=3', DC=2/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Jan. 07.80 UT: m1=10.1, Dia.=6', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Altitude: 30 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Jan. 05.43 UT: m1=10.5, Dia.=5’, DC=6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Jan. 02.98 UT: m1=10.3, Dia.=3', DC=2/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
132P/Helin–Roman-Alu
2021 Nov. 11.02 UT: m1=11.9, Dia.=3', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias, Spain, 43º 17' N, 4º 59' W, alt. 1120 m) [Faint outer coma. Field stars checked in DSS. Limiting stellar magnitude near comet: 14.7 (AQ). Mountain location, very clear sky. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Oct. 25.47 UT: m1=13.7, Dia.=1.2’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, m2= 14.8 approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 09.65 UT: m1=14.0, Dia.=0.8’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, very diffuse and transparent outer coma. Dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 06.48 UT: m1=14.2, Dia.=0.5’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, bright central condensation with stellar pseudo-nucleus. Galaxy UGC 212 visible in the same field, 1.7’away to the SSE. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
117P/Helin-Roman-Alu
2022 May  06.75 UT: m1=14.9, Dia.=0.4’, DC=5/6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Small coma, busy starfield though resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 June 06.40 UT: m1=15.3, Dia.=0.6’, DC=4', ... 40-cm L f:4(x182) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse, slightly brighter at centre, sometimes appears faintly stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  31.39 UT: m1=15.2, Dia.=0.4’, DC=6, ... 40-cm L f:4(x261) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible in good seeing. Semi-opaque outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  19.57 UT: m1=15.1, Dia.=0.3’, DC=3/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, close to star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  17.49 UT: m1=15.0, Dia.=0.4’, DC=4, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse with opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  13.44 UT: m1=15.2, Dia.=0.4’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in good seeing. Opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
116P/Wild 4
2022 May  06.48 UT: m1=13.8, Dia.=1.0’, DC=5, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  03.43 UT: m1=13.8, Dia.=1.3’, DC=3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 May  02.38 UT: m1=13.7, Dia.=1’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, faint stellar pseudo-nucleus sometimes visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 29.92 UT: m1=13.8 CCD, Dia.=0.17', DC=6/ , Tail 1.5' in PA=110 deg, ... 0.41-m f/3.9 reflector + CCD ... Sergey Shurpakov (Baran', Belarus)
2022 Apr. 20.39 UT: m1=13.6, Dia.=1.4’, DC=3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 05.43 UT: m1=14.0, Dia.=1.4’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 22.42 UT: m1=13.2, Dia.=1.7’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 21.42 UT: m1=13.7, Dia.=0.9’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight interference. 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]
2022 Feb. 09.72 UT: m1=14.0, Dia.=0.9’, DC=4, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to faint stars. Transparent outer coma, opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
111P/Helin-Roman-Crockett
2021 Mar. 09.68 UT: m1=[9.5, ... 10.2-cm R(50x) ... Andrey Semenyuta (Pavlodar, Kazakhstan) [It's too weak for a 102-mm telescope]
108P/Ciffreo
2022 Jan. 14.24 UT: m1=13.1, Dia.=1.0', DC=3, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1221 m) [Nearby field stars checked in DSS. Limiting star magnitude near comet: 14.5: (AQ). Mountain location, very clear sky. Sidgwick method. APASS comparison stars. SQM: 20.8]
104P/Kowal
2022 May  03.41 UT: m1=14.7, Dia.=0.8’, DC=2/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, Diffuse with weak centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Apr. 05.42 UT: m1=12.6, Dia.=1.4’, DC=2/3, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Apr. 04.45 UT: m1=12.9, Dia.=1.5’, DC=2/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Apr. 02.88 UT: m1=11.2, Dia.=2', DC=2, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Apr. 01.84 UT: m1=10.5, Dia.=4', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Mag. 11.1 star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2022 Mar. 23.85 UT: m1=10.0, Dia.=5', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Pico Cañón - Pimiango, Asturias, Spain, 43º 23' N, 4º 31' W, alt. 200 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2022 Mar. 22.40 UT: m1=11.2, Dia.=3.6’, DC=2/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, transparent extended coma. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Mar. 21.40 UT: m1=11.5, Dia.=2.7’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Busy star field, diffuse coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 04.85 UT: m1=9.9, Dia.=5', 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: 21.0]
2022 Feb. 27.78 UT: m1=10.5, Dia.=2.2', DC=2, ... 30.0-cm L(128x) ... Martin Mašek (Hodkovice nad Mohelkou, Czech Republic)
2022 Feb. 22.81 UT: m1=10.2, Dia.=3', DC=3, no tail ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Feb. 22.41 UT: m1=10.7, Dia.=2.0', DC=3, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2022 Feb. 19.82 UT: m1=9.9, Dia.=5', DC=3, ... 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: 21.0]
2022 Feb. 05.87 UT: m1=9.3, Dia.=6', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1530 m) [Some moonlight interference. Sidgwick method. Tycho-2 comparison stars]
2022 Feb. 04.74 UT: m1=10.1, Dia.=5', DC=2, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2022 Jan. 31.46 UT: m1=9.2, Dia.=7.5’, DC=4, ...  25-cm L f,5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre, enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 28.81 UT: m1=9.9, Dia.=5', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Jan. 28.45 UT: m1=9.8, Dia.=5.3’, DC=4, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, centre enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 23.00 UT: m1=9.7, Dia.=4', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Jan. 21.81 UT: m1=9.4, Dia.=8', 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]
2022 Jan. 07.69 UT: m1=10.2, Dia.=3', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2022 Jan. 03.46 UT: m1=9.5, Dia.=5’, DC=3/, ... 25-cm L f:5(40x) .. Chris Wyatt (Walcha, NSW, Australia) [Diffuse with opaque centre. Enhances in Swan band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 30.48 UT: m=10.0, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Possibly slightly brighter using Swan Band filter]
2021 Dec. 31.98 UT: m1=10.6, Dia.=2', DC=4, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 30.84 UT: m1=9.9, Dia.=7', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 29.47 UT: m1=10.5, Dia.=5’, DC=3/, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter, diffuse and opaque inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 26.98 UT: m1=10.9, Dia.=2', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [near a star with m1: 9.22]
88P/Howell
2021 Feb. 06.80 UT: m1=9.7, 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: 17 deg. Zodiacal light. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2021 Jan. 16.80 UT: m1=10.0, Dia.=5', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Altitude: 19 deg. Sidgwick method. Tycho-2 comparison stars]
2021 Jan. 13.78 UT: m1=10.1, Dia.=5', DC=2/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Zodiacal light. Altitude: 23 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2021 Jan. 13.45 UT: m1=12.3, Dia,=1.3’, DC=3/, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, Low altitude= 7.4°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Jan. 11.44 UT: m1=11.9, Dia.=1.8’, DC=2/, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter, very diffuse. Altitude= 13.4°. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Jan. 07.79 UT: m1=10.2, Dia.=5', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Altitude: 20 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.4]
67P/Churyumov-Gerasimenko
2022 Apr. 05.42 UT: m1=13.7, Dia.=1.1’, DC=2/3, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, very slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Apr. 04.45 UT: m1=13.5, Dia.=1’, DC=3, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Apr. 01.87 UT: m1=11.5, Dia.=2', DC=3, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2022 Mar. 23.87 UT: m1=11.4, Dia.=2', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Pico Cañón - Pimiango, Asturias, Spain, 43º 23' N, 4º 31' W, alt. 200 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2022 Mar. 22.41 UT: m1=13.3, Dia.=1.7’, DC=3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 21.40 UT: m1=13.5, Dia.=1.5’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to star but resolvable. Faint outer coma, small but stellar pseudo-nucleus visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 04.87 UT: m1=11.0, Dia.=2', DC=2/, ... 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: 21.0]
2022 Feb. 27.83 UT: m1=12.8, Dia.=0.5', DC=2, ... 30.0-cm L(189x) ... Martin Mašek (Hodkovice nad Mohelkou, Czech Republic)
2022 Feb. 22.84 UT: m1=10.8, Dia.=2', DC=3, no tail ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Feb. 22.43 UT: m1=12.3, Dia.=1.0', DC=3, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2022 Feb. 19.86 UT: m1=10.5, Dia.=3', DC=3, ... 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: 21.1]
2022 Feb. 09.71 UT: m1=10.7, Dia.=3.4’, DC=3/, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, weakly condensed. Altitude= 16.4°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Feb. 07.54 UT: m1=10.2; Dia.=3.4’; DC=4, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, weakly condensed. Semi-transparent inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Feb. 05.90 UT: m1=9.9, Dia.=4', DC=4, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars]
2022 Feb. 04.76 UT: m1=10.6, Dia.=2', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2022 Jan. 31.48 UT: m1=10.3, Dia.=4.3’, DC=5/, ... 25-cm L f,5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Star in coma, Diffuse outer coma, opaque inner coma. No enhancement in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 29.97 UT: m1=9.5, Dia.=4.5', DC=3, ... 20-cm L(63x) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 28.93 UT: m1=9.7, Dia.=4', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Jan. 22.48 UT: m1=9.1, ... 25x100 B .... David A. J. Seargent (Cowra, NSW, Australia)
2022 Jan. 21.87 UT: m1=9.5, Dia.=5', DC=5, ... 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: 20.7]
2022 Jan. 14.26 UT: m1=9.4, Dia.=4', DC=5, Tail=0.1 deg. in PA:290 deg., ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1221 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2022 Jan. 07.99 UT: m1=8.9, Dia.=5', DC=4, Tail=9 arcmin. in AP=289 deg., ... 8-cm B(20X) ... Valentín Díaz (La Romana, Alicante, Spain) [Tail with 30-cm L 78X]
2022 Jan. 06.91 UT: m1=9.5, Dia.=4', DC=4, no tail ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Jan. 03.99 UT: m1=9.2, Dia.=4', DC=5, ... 12.5-cm L(40X) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 03.51 UT: m1=9.0, Dia.=3.4’, DC=5, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 10’ in length in P.A. 265° approximately. Dims in Swan Band filter. Altitude= 9.9°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 02.19 UT: m1=9.4, Dia.=4', DC=4, ... 22-cm L(60x)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 30.90 UT: m1=9.2, Dia.=5', DC=5, Tail=0.3 deg. in PA:280 deg., ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars.].
2021 Dic. 29.91 UT: m1=9.5, Dia.=3', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Dec. 26.14 UT: m1=9.1, Dia.=4', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) 
2021 Dec. 18.67 UT: m1=8.9, Dia.=3.3', DC=4, ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Dec. 14.68 UT: m1=9.6, Dia.=3.2’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Tail visible, traced to 15.5’ in length in P.A. 274° approximately; Short coma extension to the WSW adjacent to tail. Outer coma dims in Swan Band but centre enhances. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 13.67 UT: m1=10.2, Dia.=2.1’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Tail visible, traced to 11.2’ in length in P.A. 279° approximately. Star in coma. Inner coma enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 12.26 UT: m1=8.8, Dia.=6', DC=4/, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 12.20 UT: m1=8.7, Dia.=7', DC=5, no tail, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2021 Dec. 11.19 UT: m1=8.3, Dia.=8', DC=5, Tail=0.5 deg. in PA:290 deg., ... 25x100 B ... Juan Jose Gonzalez (Mora - Sierra del Castillo de Peñas Negras, Toledo, Spain, 39º 41' N, 3º 44' W, alt. 905 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2021 Dec. 04.27 UT: m1=9.0, Dia.=4', DC=5, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 04.28 UT: m1=8.9, Dia.=5', DC=4/, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 04.21 UT: m1=8.8, Dia.=5', DC=6, ... 20x80 B, ... Valentín Díaz (La Romaneta, Alicante, España)
2021 Dec. 03.00 UT: m1=8.4, Dia.=7', DC=5/, Tail=0.6 deg. in PA:290 deg., ... 25x100 B ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [In 20 cm SCT (77x): m1=9.0, Dia.=4', DC=5. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Nov. 28.29 UT: m1=9.0, Dia.=5', DC=4/, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2021 Nov. 16.06 UT: m1=9.0, Dia.=3.5', DC=5, Tail=5 arcmin. in PA: 290 deg., … 25.4-cm L(48x) … Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 15.27 UT: m1=9.0, Dia.=5', DC=5, … 22-cm L(60x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 15.28 UT: m1=8.9, Dia.=6', DC=4, … 20x100 B … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 13.67 UT: m1=9.1, Dia.=3.3’, DC=6, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Tail visible, traced to 12’ in length in P.A. 275°. Coma centre enhances in Swan Band filter. -Observing with Warwick Holmes, Australian Electrical Engineer for ESA Rosetta/Philae spacecraft. Gave him his first visual of the comet upon which the spacecraft he helped build now call home-. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Nov. 11.11 UT: m1=9.2, Dia.=4', DC=5/, ... 25x100B ... Juan Jose Gonzalez (Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias, Spain, 43º 17' N, 4º 59' W, alt. 1120 m) [In 20 cm SCT (77x): m1=9.8, Dia.=4', DC=5, Tail= 0.25 deg. in PA 280 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 Nov. 09.85 UT: m1=9.0, Dia.=3', DC=6, Tail=6 arcmin. in PA: 290 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 07.01 UT: m1=10.0, Dia.=2.3', DC=5, ... 20-cm L(70x) ... Valentín Díaz (La Romana, Alicante, España)
2021 Nov. 05.21 UT: m1=9.9, Dia.=4', DC=5, Tail= 0.15 deg. in PA: 280 deg., ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m ) [ Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2021 Nov. 04.10 UT: m1=9.5, Dia.=3', DC=4, ... 20cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Nov. 04.05 UT: m1=9.5, Dia.=2.2', DC=7, Tail=5 arcmin. in PA: 280 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 02.25 UT: m1=9.5, Dia.=3', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Little or no enhance with comet filter]
2021 Oct. 31.97 UT: m1=9.6, Dia.=1.8', DC=6, Tail=3.5 arcmin. in PA: 280 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 27.91 UT: m1=9.9, Dia.=4', DC=4/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Altitude: 8 deg. Before moonrise. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2021 Oct. 16.06 UT: m1=10.6, Dia.=1.3', DC=6, Tail=3 arcmin. in PA: 285 deg., ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 13.21 UT: m1=10.1, Dia.=2', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Oct. 09.68 UT: m1=10.7, Dia.=2.1’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 11’ in length in P.A. 265° approximately. Outer coma dims in Swan Band filter but centre enhances. Inner coma appears fanned slightly along tail axis. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 08.71 UT: m1=10.5, Dia.=2.6’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter, Faint tail visible, traced to 7.5’in length in P.A. 265° approximately. With comet placed on the North-West edge of the field, Messier 1 (Crab Nebula) is visible on the opposite edge of the field. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 07.89 UT: m1=11.3, Dia.=1.5', DC=5, Tail=3 arcmin. in PA: 260 deg., ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 07.00 UT: m1=10.1, Dia.=4', DC=4/, Tail=0.2 deg. in PA: 260 deg., ... 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: 20.9]
2021 Oct. 05.13 UT: m1=10.1, Dia.=3.5', DC=4, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Sep. 30.86 UT: m1=11.2, Dia.=2', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 19.75 UT: m1=11.3, Dia.=1.1', DC=7/, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Sep. 17.08 UT: m1=10.8, Dia.=4', DC=4 ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Las Retuertas - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1350 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Sep. 11.73 UT: m1=11.8, Dia.=1.2’, DC=6, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 6.2’ in length in P.A. 260° approximately. Opaque oval inner coma extending into the tail about 2.5’ before fading gradually to its extremity. Coma dims in Swan Band filter but pseudo-nucleus enhances. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 09.99 UT: m1=12.0, Dia.=1', DC=6, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 08.40 UT: m1=12.9, Dia.=1.5’, DC=5/6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, faint stellar pseudo-nucleus visible in good seeing. Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 07.72 UT: m1=12.4, Dia.=1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 3.5’ in length in P.A. 260° approximately. Opaque inner coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 05.00 UT: m1=10.9, Dia.=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. Tycho-2 comparison stars. SQM: 21.2]
2021 Sep. 02.91 UT: m1=12.1, Dia.=1', DC=5, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Aug. 13.58 UT: m1=13.5, Dia.=0.8’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 1.3’ in length in P.A. 263° approximately. Stellar pseudo-nucleus visible, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 11.06 UT: m1=11.3, Dia.=4', DC=3/ ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Wider coma diameter and significantly brighter m1 estimate in comparison with my previous Aug. 6.08 observation. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2021 Aug. 10.73 UT: m1=13.6, Dia.=0.9’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 2.3’ in length in P.A. 253° approximately. No enhancement in Swan Band filter. Stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.73 UT: m1=13.9, Dia.=1.3’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Opaque inner coma, pale aqua-blue stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.08 UT: m1=12.7, Dia.=1.5', DC=5, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Motion followed for 30 min. Limiting stellar magnitude: 14.7. Sidgwick method. APASS comparison stars. SQM: 21.4]
2021 July 12.76 UT: m1=15.0, Dia.=0.4’, DC=5/6, ... 40-cm L f:4(x182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse opaque inner coma, appears stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 06.73 UT: m1=15.1, Dia=0.3’, DC=6, ... 40-cm L f:4 (261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse outer coma, stellar pseudo-nucleus visible in good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
57P/du Toit-Neujmin-Delporte
2021 Nov. 07.97 UT: m1=11.8:, Dia.=1.5', DC=3/, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2021 Oct. 27.78 UT: m1=11.3, Dia.=2.0', DC=4, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2021 Oct. 25.42 UT: m1=12.7, Dia.=0.9’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 2.6’ in length in P.A. 084°, Coma dims in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 22.95 UT: m1=11.5, Dia.=1.5', DC=5, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
29P/Schwassmann-Wachmann 1
2022 Apr. 01.89 UT: m1=11.2, Dia.=5', DC=1/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Faint and diffuse coma, remnant of previous outbusts. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6]
2022 Mar. 22.38 UT: m1=[14.3, Dia.=--, DC=--, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than mag 14.3 star in-focus. Altitude = 16.8°. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2022 Mar. 21.38 UT: m1=[13.9, Dia.=--, DC=--, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than mag 13.9 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2022 Feb. 07.52 UT: m1=[14.2; Dia.=--; DC=--, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than a magnitude 14.2 star in-focus. Altitude= 10.8°. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2022 Jan. 31.46 UT: m1=[14.6, Dia.=--, DC=--, ... 25-cm L f,5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, Fainter than a mag 14.6 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ
2022 Jan. 28.45 UT: m1=[14.7, Dia.= --, DC=--, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible. Fainter than a mag 14.7 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2022 Jan. 03.49 UT: m1=[14.1, Dia.=--, DC=--, ... 25-cm L f:5(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible. Fainter than 14.1 magnitude star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2021 Dec. 30.86 UT: m1=10.5, Dia.=7', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 02.84 UT: m1=10.2, Dia.=6', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Nov. 13.69 UT: m1=11.0, Dia.=2.9’, DC=2/, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2021 Nov. 11.09 UT: m1=10.1, Dia.=5', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias, Spain, 43º 17' N, 4º 59' W, alt. 1120 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Nov. 09.83 UT: m1=12.0, Dia.=2', DC=1/, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 05.11 UT: m1=10.0, Dia.=4', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Nov. 04.05 UT: m1=10.8, Dia.=3', DC=2, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Nov. 04.03 UT: m1=10.4, Dia.=5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 31.81 UT: m1=10.9, Dia.=3', DC=2, ... 25.4-cm L(171.4x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 27.87 UT: m1=10.1, Dia.=4', 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: 20.9]
2021 Oct. 19.07 UT: m1=11.9, Dia.=1.5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 13.23 UT: m1=10.6, Dia.=2.5', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Oct. 09.69 UT: m1=10.9, Dia.=2.3’, DC=4, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Post-outburst, Coma dims in Swan Band filter but coma centre appears to enhance slightly. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 08.73 UT: m1=11.0, Dia.=1.6’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Post-outburst, Coma dims in Swan Band filter but inner coma appears to enhance slightly. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 07.88 UT: m1=10.7, Dia.=1.3', DC=6, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Oct. 07.01 UT: m1=10.4, Dia.=2.5', DC=6, ... 20 cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [In evolution after the recent outbursts. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Oct. 05.03 UT: m1=11.0, Dia.=1.5', DC=7, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Oct. 03.82 UT: m1=11.2, Dia.=1.2', DC=7, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 30.84 UT: m1=11.0, Dia.=1', DC=8/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 29.84 UT: m1=10.8, Dia.=0.4', DC=9, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 28.93 UT: m1=11.2, Dia.= --, DC=8, ... 20 cm SCT (77x) ... Juan Jose Gonzalez (Alto del Trichero, León, Spain, 42º 46' N, 5º 53' W, alt. 1190 m) [In outburst. Near-stellar appearance. Comet close to star of mag. 12.4 (GSC). Altitude: 16 deg. Observation made before moonrise. In-focus method. Tycho-2 comparison stars. SQM: 20.6.].
2021 Sep. 17.10 UT: m1=12.9, Dia.=1.5', DC=3, ... 20-cm SCT(166x) ... Juan Jose Gonzalez (Las Retuertas - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1350 m) [In evolution after the recent outburst. Field stars checked in DSS. Limiting stellar magnitude near comet: 14.5 (APASS). Sidgwick method. APASS comparison stars. SQM: 21.2]
2021 Sep. 11.76 UT: m1=14.8, Dia.=0.4’, DC=2/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, close to mag 14.3 star but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Sep. 07.75 UT: m1=14.4, Dia.=0.8’, DC=3, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Sep. 05.04 UT: m1=13.2, Dia.=0.5', DC=5, ... 20-cm SCT(166x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [In evolution after the recent outburst. Field stars checked in DSS. Limiting stellar magnitude near comet: 14.5 (APASS). Sidgwick method. APASS comparison stars. SQM: 21.2]
2021 Aug. 10.76 UT: m1=[14.9, Dia.=--, DC=--, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.9 star “in-focus”. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2021 Jan. 13.82 UT: m1=10.8, Dia.=6', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada de la Cobertoria, Asturias, Spain, 43º 9' N, 5º 54' W, alt. 1179 m) [Faint and diffuse outer coma, remnant of previous outbursts. Mag. 11.4 (TK) star in coma. Nearby field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Jan. 13.47 UT: m1=[14.4, Dia.=--, DC=--, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.4 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2021 Jan. 11.46 UT: m1=[14.3, Dia.=--, DC=--, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible, fainter than magnitude 14.3 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
2021 Jan. 07.82 UT: m1=11.0, Dia.=6', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Faint and diffuse outer coma, remnant of previous outbursts. Nearby field stars checked in DSS. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Jan. 05.44 UT: m1=[13.5, Dia.=--, DC=--, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Not visible; fainter than magnitude 13.5 star in-focus. Comparison stars checked using APASS data in Guide 9.0, Method= I, Cat= AQ]
22P/Kopff
2022 May  06.76 UT: m1=11.8, Dia.=2.5’, DC=3, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, very diffuse. Slight interference by glare from Mars nearby. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
19P/Borrelly
2022 May  04.91 UT: m1=10.2, Dia.=4', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Camposagrado - Cuadros, León, Spain, 42º 42' N, 5º 41' W, alt. 1080 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2022 Apr. 29.85 UT: m1=13.3 CCD, Dia.=0.28', DC=7 , Tail 0.9' in PA=75 deg, ... 0.41-m f/3.9 reflector + CCD ... Sergey Shurpakov (Baran', Belarus)
2022 Apr. 29.84 UT: m1=10.9, Dia.=2.5', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Apr. 24.80 UT: m1=11.2, Dia.=1.5', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Gomel, RB)
2022 Apr. 28.91 UT: m1=10.3, Dia.=3.5', DC=4, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Cueto Rosales, León, Spain, 42º 46' N, 6º 02' W, alt. 1420 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2022 Apr. 02.86 UT: m1=10.4, Dia.=2.5', DC=4, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Apr. 01.86 UT: m1=9.9, Dia.=3.5', DC=5, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.7]
2022 Mar. 23.84 UT: m1=9.8, Dia.=3.5', DC=5, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Pico Cañón - Pimiango, Asturias, Spain, 43º 23' N, 4º 31' W, alt. 200 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2022 Mar. 22.38 UT: m1=9.8, Dia.=2.5’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 8.7°, Diffuse coma, opaque centre. Twilight interference. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2022 Mar. 21.38 UT: m1=9.8, Dia.=2.5’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 9.2°, Twilight interference. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Mar. 06.97 UT: m1=9.7, Dia.=3', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Mar. 04.84 UT: m1=9.4, Dia.=4', DC=5, ... 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: 20.9]
2022 Feb. 27.76 UT: m1=10.0, Dia.=2.0', DC=4, ... 30.0-cm L(128x) ... Martin Mašek (Hodkovice nad Mohelkou, Czech Republic)
2022 Feb. 22.80 UT: m1=9.5, Dia.=3', DC=4, no tail ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Feb. 22.40 UT: m1=9.2, Dia.=4.5', DC=4/, ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Ibaraki, Japan)
2022 Feb. 20.97 UT: m1=9.1, Dia.=3', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Feb. 19.81 UT: m1=9.3, Dia.=4', DC=5, ... 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: 20.9]
2022 Feb. 05.85 UT: m1=9.1, Dia.=5', DC=5, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain, 42º 54' N, 5º 48' W, alt. 1530 m) [Some moonlight interference. Sidgwick method. Tycho-2 comparison stars]
2022 Feb. 04.73 UT: m1=9.3, Dia.=4', DC=6, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia)
2022 Jan. 31.45 UT: m1=8.8, Dia.=8’, DC=6, ... 25-cm L f,5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint elongations of the coma to the South and East. Opaque centre, stellar pseudo-nucleus visible. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 29.86 UT: m1=9.4, Dia.=3', DC=4, ... 20-cm L(63X) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 28.78 UT: m1=9.5, Dia.=4', DC=5, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2022 Jan. 28.44 UT: m1=8.9, Dia.=5’, DC=6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma dims in Swan Band filter and enhances inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2022 Jan. 22.98 UT: m1=8.7, Dia.=4', DC=4, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2022 Jan. 21.98 UT: m1=8.8, Dia.=4', DC=4, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Clouds]
2022 Jan. 21.84 UT: m1=8.8, Dia.=7', DC=5, ... 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: 21.2]
2022 Jan. 07.66 UT: m1=9.2, Dia.=4', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2022 Jan. 03.47 UT: m1=9.3, Dia.=3.8’, DC=6, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band filter. Opaque centre, diffuse outer, stellar pseudo-nucleus. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 31.99 UT: m1=9.5, Dia.=4', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 31.49 UT: m1=9.0, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 31.45 UT: m1=9.5, Dia.=8.5’, DC=5/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, transparent outer, opaque inner coma with faint stellar central condensation. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 30.83 UT: m1=9.1, Dia.=5', DC=4, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 30.50 UT: m1=8.9, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)
2021 Dec. 29.47 UT: m1=9.0, Dia.=7.5’, DC=4/, ... 15x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Diffuse outer, opaque inner coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Dec. 25.98 UT: m1=9.6, Dia.=4', DC=4/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 25.02 UT: m1=9.7, Dia.=3', DC=4, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 04.97 UT: m1=10.7, Dia.=2', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Dec. 02.82 UT: m1=9.8, Dia.=6', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Altitude: 10 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2021 Nov. 27.96 UT: m1=11.0, Dia.=2.5', DC=4, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 21.96 UT: m1=11.1, Dia.=2', DC=4, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 02.12 UT: m1=11.6, Dia.=1.5', DC=4, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Oct. 25.44 UT: m1=12.9, Dia.=1.2’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, transparent outer coma. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 09.64 UT: m1=13.6, Dia.=1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter, stellar pseudo-nucleus visible, transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 08.69 UT: m1=13.4, Dia.=1.3’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar pseudo-nucleus visible, bright star to the South-West in the field, annoying. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 06.45 UT: m1=13.7, Dia.=1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter, Faint stellar pseudo-nucleus visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 11.71 UT: m1=14.6, Dia.=0.6’, DC=6, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement, opaque centre, stellar centre in good seeing. Windy conditions. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 08.48 UT: m1=15.0, Dia.=0.3’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma small, whitish coloured centre, faint stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 07.70 UT: m1=14.9, Dia.=0.6’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint stellar pseudo-nucleus visible, diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 31.45 UT: m1=15.2, Dia.=0.4’, DC=6, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, semi-transparent coma, stellar pseudo-nucleus. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.47 UT: m1=15.0, Dia.=0.4’, DC=4/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, opaque coma, close to faint star. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]17P/Holmes
2021 Aug. 11.14 UT: m1=13.5, Dia.=0.8', DC=4, ... 20-cm SCT(206x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Brighter after the recent outburst. Sidgwick method. APASS comparison stars. SQM: 21.2]
15P/Finlay
2021 Sep. 19.77 UT: m1=13.3, Dia.=0.9', DC=2, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Sep. 07.01 UT: m1=12.5:, Dia.=1', DC=2/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Sep. 05.12 UT: m1=11.3, Dia.=3', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2021 Aug. 21.01 UT: m1=11.8, Dia.=1.8', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 11.11 UT: m1=10.3, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Aug. 10.77 UT: m1=11.9, Dia.=1.6’, DC=3/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 13.8°, Diffuse, weakly condensed. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 07.99 UT: m1=12.1, Dia.=2', DC=4/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 06.12 UT: m1=10.1, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2021 Aug. 06.10 UT: m1=11.2, Dia.=1.5', DC=5, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 July 19.35 UT: m1=10.7, Dia.=3', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 July 14.11 UT: m1=10.2, 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: 20.9]
2021 July 12.77 UT: m1=11.3, Dia.=2.6’, DC=4, ... 40-cm L f:4(x59x) ... Chris Wyatt (Walcha, NSW, Australia) [Altitude= 18.6°, Diffuse, opaque centre. Enhances slightly in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 10.10 UT: m1=10.8, Dia.=3', DC=2, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 July 09.10 UT: m1=10.3, Dia.=5', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 July 06.76 UT: m1=11.1, Dia=2.9’, DC=4, ... 40-cm L f:4 (59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Opaque inner coma, semi-transparent outer coma. Altitude= 18.6°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
10P/Tempel 2
2021 Aug. 10.74 UT: m1=14.8, Dia.=0.6’, DC=2/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 July 12.76 UT: m1=13.6, Dia.=1.1’, DC=3/4, ... 40-cm L f:4(x182x) ... 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]
2021 July 06.75 UT: m1=13.5, Dia=1’, DC=3/4, ... 40-cm L f:4 (182x) ... 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]
2021 Apr. 19.78 UT: m1=11.2, Dia.=3.1’, DC=4, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 15.5°. Enhances in Swan Band filter. Diffuse with opaque centre. Zodiacal light interference. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Apr. 13.76 UT: m1=11.4, Dia.=3.1’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 10.0°. Diffuse outer coma brightening gradually to and opaque centre. Enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Apr. 12.76 UT: m1=11.4, Dia.=1.5’, DC=4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 10.1°. Enhances in Swan Band filter. Diffuse, opaque inner coma. Zodiacal light interference. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Apr. 10.35 UT: m1=10.1, Dia.=3', DC=4, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 18° / Sun altitude: -14°]
2021 Mar. 25.77 UT: m1=10.6, Dia.=2’, DC= 3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 12.3°, Zodiacal light interference. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2021 Mar. 24.77 UT: m1=10.6, Dia.=1.6’, DC=3/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.2°, zodiacal light interference. Enhances slightly in Swan Band filter. Opaque centre, fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
9P/Tempel 1
2022 May  06.74 UT: m1=14.7, Dia.=0.7’, DC=2, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
8P/Tuttle
2021 Nov. 13.71 UT: m1=10.4, Dia.=3.5’, DC=3, … 40-cm L f:4(59x) … Chris Wyatt (Walcha, NSW, Australia) [Altitude= 16.5°, Very diffuse, enhances slightly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2021 Oct. 13.32 UT: m1=9.5, Dia.=2.5', DC=4/, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Comet altitude: 17° / Sun altitude: -15°]
2021 Oct. 09.72 UT: m1=9.2, Dia.=2.9’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 9.4°, Enhances strongly in Swan Band filter. Opaque coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2021 Sep. 11.77 UT: m1=8.9, Dia.=3.1’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 11.7°, Opaque coma, well condensed, enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK
2021 Sep. 07.77 UT: m1=9.0, Dia.=2.8’, DC=5, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 9.9°, Diffuse opaque coma, enhances strongly in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
7P/Pons-Winnecke
2021 Sep. 11.70 UT: m1=14.1, Dia.=1.3’, DC=3, ... 40-cm L f:4(182x) ... 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]
2021 Sep. 08.47 UT: m1=13.6, Dia.=1.5’, DC=2/3, ... 40-cm L f:4(108x) ... 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]
2021 Sep. 07.69 UT: m1=14.0, Dia.=0.9’, DC=4, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 31.45 UT: m1=12.4, Dia.=4.4’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, slight opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 28.46 UT: m1=12.9, Dia.=2.2’, DC=4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 13.57 UT: m1=12.8, Dia.=2.5’, DC=5/6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, opaque centre, stellar pseudo-nucleus sometimes visible. No enhancement in Swan Band filter. Close to grouping of faint stars. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 Aug. 10.44 UT: m1=11.7, Dia.=4.4’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Very diffuse and extended coma. Slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 06.50 UT: m1=11.6, Dia.=4’, DC=4, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Star in coma, very diffuse and extended outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 31.51 UT: m1=11.8, Dia.=6’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter, outer coma very tenuous and extended. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 30.50 UT: m1=13.0, Dia.=1.9’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, stellar pseudo-nucleus visible. Close to stars. Outer coma extended. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 29.47 UT: m1=12.4, Dia.=1.8’, DC=5/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims in Swan Band filter. Opaque centre, sometimes faintly stellar in good seeing. Transparent outer coma. Close to stars. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 12.74 UT: m1=11.2, Dia.=3.1’, DC=5, ... 40-cm L f:4(x59x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse opaque centre, sometimes appears faintly stellar. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 July 09.11 UT: m1=10.5, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2021 July 06.71 UT: m1=11.8, Dia=4.8’, DC=6, ... 40-cm L f:4 (59x) ... Chris Wyatt (Walcha, NSW, Australia) [Dims slightly in Swan Band filter. Outer coma extended, slight interference from stars on NE edge of coma. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2021 June 15.22 UT: m1=11.2, Dia.=3', DC=3/. ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 June 10.08 UT: m1=10.6 Dia.=5', DC=2/, Tail= 0.15 deg. in PA 270 deg,... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 June 05.10 UT: m1=10.8, Dia.=4', DC=2/, Tail= 0.15 deg. in PA 260 deg, ... 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]
2021 May  19.62 UT: m1=12.8, Dia.=2’, DC=4/, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Opaque centre, transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method=M, Cat=AQ]
2021 May  13.72 UT: m1=14.4, Dia.=0.3’, DC=5/, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Opaque centre, small coma. Close to bright stars but resolvable. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 May  08.13 UT: m1=11.3, Dia.=2.5', DC=1/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Collado del Fresno - Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1221 m) [From dark mountain skies the outer coma appears large and very diffuse. Nearby field stars checked in DSS. Motion checked over a 50-min period. Limiting star magnitude near comet: 13.9 (APASS). Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 May  06.96 UT: m1=12.9, Dia.=1.5', DC=2, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
6P/d'Arrest
2022 Jan. 21.80 UT: m1=10.5, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2022 Jan. 03.46 UT: m1=11.3, Dia.=4.2’, DC=4, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse and extended, slightly brighter centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Dec. 30.82 UT: m1=10.0, Dia.=6', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 29.48 UT: m1=10.4, Dia.=6.5’, DC=3, ... 25-cm L f:5(40x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, faint star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2021 Dec. 02.83 UT: m1=10.1, Dia.=6', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Nov. 27.98 UT: m1=10.6, Dia.=3', DC=3, … 22-cm L(160x) … Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Near a star with m1: 9.17]
2021 Nov. 07.98 UT: m1=10.1, Dia.=4', DC=2, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 05.02 UT: m1=10.1, Dia.=4', DC=2, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Nov. 02.96 UT: m1=10.2, Dia.=4', DC=2, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Oct. 27.80 UT: m1=10.2, Dia.=5', DC=1/, ... 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: 20.6]
2021 Oct. 25.45 UT: m1=10.6, Dia.=4.5’, DC=3/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Very large and diffuse coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 06.43 UT: m1=12.2, Dia.=1.9’, DC=4, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, weakly condensed. Slight enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 04.80 UT: m1=11.6, Dia.=2', DC=2, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Sep. 08.44 UT: m1=13.6, Dia.=0.8’, DC=2, ... 40-cm L f:4(261x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, difficult due to crowded star field. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 04.85 UT: m1=11.1, 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) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Aug. 31.43 UT: m1=12.5, Dia.=2.9’, DC=2/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, very diffuse and extended. Slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Aug. 10.91 UT: m1=11.8, 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) [Wide and faint outer coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
4P/Faye
2022 Feb. 07.53 UT: m1=12.6; Dia.=1’; DC=3, ... 25-cm L f:5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, difficult. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2022 Jan. 31.47 UT: m1=13.0, Dia.=0.7’, DC=3, ... 25-cm L f,5(125x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, Very diffuse. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ
2022 Jan. 29.92 UT: m1=12.3, Dia.=1.5', DC=3, ... 20-cm L(96x) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 07.97 UT: m1=11.4, Dia.=1.3', DC=3, ... 30-cm L (115X) ... Valentín Díaz (La Romana, Alicante, Spain)
2022 Jan. 06.89 UT: m1=11.6, Dia.=1.5', DC=3, no tail ... 20-cm SCT(117x) ... Carlos Labordena (Castellón, España)
2022 Jan. 03.48 UT: m1=12.0, Dia.=2.4’, DC=4/, ... 25-cm L f:5(74x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, dims in Swan Band filter, opaque centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Dec. 30.88 UT: m1=11.2, Dia.=1.5', DC=2/, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Collado de Vega Cubiellos - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 55' W, alt. 1516 m) [Sidgwick method. Tycho-2 comparison stars]
2021 Dec. 18.68 UT: m1=11.5, Dia.=0.5', DC=6, ... 40.0-cm L f/4.5(257x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Dec. 14.69 UT: m1=12.0, Dia.=1.4’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint and slightly fanned tail visible, traced to 4.5’in length in P.A. 297° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ)
2021 Dec. 13.69 UT: m1=12.3, Dia.=0.8’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma dims in Swan Band filter. Faint tail visible, traced to 3.2’in length in P.A. 275°. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Dec. 03.22 UT: m1=10.8, Dia.=3', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Sierra de Nuestra Señora - Castrocontrigo, León, Spain, 42º 10' N, 6º 12' W, alt. 1150 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Nov. 16.05 UT: m1=11.0, Dia.=1.5', DC=3, … 25.4-cm L(171.4x) … Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 13.72 UT: m1=11.6, Dia.=1.9’, DC=3, … 40-cm L f:4(108x) … Chris Wyatt (Walcha, NSW, Australia) [Weakly condensed oval-shaped coma oriented East-West. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2021 Nov. 11.17 UT: m1=11.0, Dia.=3', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias, Spain, 43º 17' N, 4º 59' W, alt. 1120 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1.]
2021 Nov. 11.03 UT: m1=11.3, Dia.=1.5', DC=3, ... 25.4-cm L(171.4x) ...Alexsandr Morozov (Sukhinichi, Russia)
2021 Nov. 05.09 UT: m1=11.2, Dia.=3', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Matadeon de los Oteros, Leon, Spain, 42º 20' N, 5º 23' W, alt. 870 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9]
2021 Nov. 04.14 UT: m1=11.3, Dia.=2', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2021 Oct. 31.96 UT: m1=11.1, Dia.=2', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 19.08 UT: m1=11.6, Dia.=2', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Oct. 13.25 UT: m1=10.8, Dia.=2', DC=4, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Oct. 09.67 UT: m1=11.9, Dia.=1.6’, DC=5/, ... 40-cm L f:4(59x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 7.5’in length in P.A. 274° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 08.72 UT: m1=12.0, Dia.=1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma transparent, inner coma opaque, faint stellar pseudo-nucleus visible. Faint tail traced to 4.7’ in length in P.A. 272° approximately. Encroaching fog during observation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Oct. 07.18 UT: m1=10.5, Dia.=3', DC=2/, ... 20 cm SCT (100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2021 Oct. 05.15 UT: m1=11.2, Dia.=3', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Oct. 05.03 UT: m1=11.3, Dia.=1.5', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 19.76 UT: m1=11.8, Dia.=1.8', DC=4/, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Ibaraki, Japan)
2021 Sep. 17.13 UT: m1=10.3, Dia.=5', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Las Retuertas - Sierra del Aramo, Asturias, Spain, 43º 10' N, 5º 54' W, alt. 1350 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2021 Sep. 11.75 UT: m1=11.9, Dia.=1.1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 5.2’ in length in P.A. 267° approximately. Coma dims in Swan Band filter. Opaque inner coma, transparent outer coma elongated along the axis of the tail about 2.6’ in length before gradually fading in brightness. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 09.99 UT: m1=11.4, Dia.=1', DC=4/, Tail= 2 arcmin. in PA: 265 deg., ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Sep. 07.74 UT: m1=11.4, Dia.=1.2’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, traced to 5’ in length in P.A. 267° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Sep. 05.03 UT: m1=10.5, Dia.=4', 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: 21.0]
2021 Sep. 04.97 UT: m1=11.1, Dia.=2.5', DC=4/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Sukhinichi, Russia)
2021 Sep. 04.32 UT: m1=10.9, Dia.=3', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2021 Aug. 21.00 UT: m1=12.0, Dia.=1.2', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 11.08 UT: m1=11.0, Dia.=4', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 Aug. 10.75 UT: m1=12.4, Dia.=1.1’, DC=6, ... 40-cm L f:4(108x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Faint tail visible, traced to 4’ in length in P.A. 260° approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 07.95 UT: m1=11.7, Dia.=1.2', DC=3, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 Aug. 06.74 UT: m1=12.8, Dia.=0.9’, DC=5/, ... 40-cm L f:4(182x) ... Chris Wyatt (Walcha, NSW, Australia) [No enhancement in Swan Band filter. Close to star but resolvable. Diffuse coma, opaque centre, stellar pseudo-nucleus sometimes visible. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2021 Aug. 06.08 UT: m1=11.2, Dia.=2', DC=3, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España) [no tail]
2021 Aug. 06.09 UT: m1=10.9, Dia.=4', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2021 July 15.97 UT: m1=[12.8, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia)
2021 July 14.09 UT: m1=10.8, Dia.=4', 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: 21.1]
2021 July 09.08 UT: m1=11.1, Dia.=4', DC=2/, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain, 42º 55' N, 5º 48' W, alt. 1720 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]

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)

  • Últimas observaciones / Recent Observations

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