Recent Comet Brightness Estimates

2P/Encke
Total-magnitude and coma-diameter estimates:
2020 Sep. 05.41, 13.2, 4.3' (T. Lehmann, SSO (remote), 0.106-m refractor)
2020 Aug. 31.40, 13.4, 4.4' (T. Lehmann, SSO (remote), 0.106-m refractor)

11P/Tempel-Swift-LINEAR
Total-magnitude and coma-diameter estimates:
2020 Sep. 19.88, 17.9, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 14.93, 18.2, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 10.86, 18.9, 0.25' (A. Novichonok, Simeiz observatory, 1.0-m Ritchey-Chretien)
2020 Aug. 30.12, 19.0, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2020 Sep. 20.10, 13.0, 1.2' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Sep. 19.97, 15.0, 0.3' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 19.79, 13.6, 0.75' (H. Kiiskinen, 0.4-m Ritchey-Chretien)
2020 Sep. 19.00, 13.3, 5.1' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 19.00, 12.3, 3.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 18.09, 12.2, 6.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.08-deg tail in p.a. 239)
2020 Sep. 18.03, 12.9, 2.3' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 16.11, 12.7, 1.8' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Sep. 15.09, 12.5, 5.9' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 15.00, 14.1, 0.9' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 14.98, 13.8, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 14.02, 13.0, 3.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 13.92, 14.8, 0.6' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 13.19, 12.4, 3.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 13.06, 13.9, 1' (V. Díaz, Puebla de Don Fadrique, Granada, Spain, 0.254-m Newtonian reflector)
2020 Sep. 12.09, 12.5, 6.4' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 09.93, 11.0, 5' (J. Gonzalez Suarez, Alto del Castro, 1720 m, Leon, Spain, 0.203-m Schmidt-Cassegrain)
2020 Sep. 05.97, 14.7, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 04.01, 14.6, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Aug. 30.15, 12.5, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Aug. 30.05, 13.8, 1.5' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)

58P/Jackson-Neujmin
Total-magnitude and coma-diameter estimates:
2020 Sep. 18.14, 16.1, 0.8' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 08.12, 13.9, 3' (S. Fritsche, Koeditz, 0.1-m refractor; 0.05-deg tail in p.a. 262)

84P/Giclas
Total-magnitude and coma-diameter estimates:
2020 Sep. 18.23, 16.6, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

88P/Howell
Total-magnitude and coma-diameter estimates:
2020 Sep. 24.94, 9.2, 3' (J. de Souza Aguiar, 0.27-m Newtonian reflector)
2020 Sep. 23.94, 9.1, 3' (J. de Souza Aguiar, 0.27-m Newtonian reflector)
2020 Sep. 23.40, 9.3, 6.2' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 22.41, 9.1, 6.5' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 21.41, 8.8, 2.5' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Sep. 14.44, 8.7, 6' (M. Mattiazzo, Swan Hill, Victoria, 25x100 binoculars)
2020 Sep. 14.44, 8.8, 4' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 13.43, 9.0, 5' (P. Camilleri, 20x80 binoculars)
2020 Sep. 12.72, 10.0, 3' (A. Novichonok, With Nikon D5200 (128-mm lens), 0.028-m refractor)
2020 Sep. 12.42, 8.8, 5' (P. Camilleri, 0.08-m refractor)
2020 Sep. 11.82, 9.0, 3' (C. Labordena, Vistabella, 0.2-m Schmidt-Cassegrain)
2020 Sep. 11.43, 8.8, 6' (P. Camilleri, 20x80 binoculars)
2020 Sep. 10.44, 8.9, 6' (P. Camilleri, 20x80 binoculars)
2020 Sep. 09.42, 8.6, 6' (M. Mattiazzo, Swan Hill, Victoria, 25x100 binoculars)
2020 Sep. 08.42, 8.9, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 07.85, 8.7, 8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Sep. 07.43, 9.0, 4' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 07.39, 8.9, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 06.94, 9.2, 3.5' (M. Goiato, 0.22-m Newtonian reflector)
2020 Sep. 06.94, 9.2, 3' (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 06.42, 9.0, 5' (P. Camilleri, 20x80 binoculars)
2020 Sep. 05.94, 9.2, 2' (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 05.83, 9.4, 2' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2020 Sep. 05.39, 9.0, 17' (T. Lehmann, SSO (remote), 0.106-m refractor)
2020 Sep. 04.94, 9.2, 2' (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 03.94, 9.2, 3' (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 02.94, 9.2, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 01.94, 9.3, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Aug. 30.94, 9.3, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Aug. 30.37, 9.2, 14' (T. Lehmann, SSO (remote), 0.106-m refractor)
2020 Aug. 29.94, 9.3, -- (J. de Souza Aguiar, 25x100 binoculars)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.00, 17.7, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

115P/Maury
Total-magnitude and coma-diameter estimates:
2020 Sep. 15.86, 14.8, 2.2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)
2020 Sep. 10.87, 15.8, 1' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 05.87, 15.8, 0.9' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)

156P/Russell-LINEAR
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.04, 15.8, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

162P/Siding Spring
Total-magnitude and coma-diameter estimates:
2020 Sep. 02.55, 16.1, 0.1' (A. Pearce, Nedlands, W. Australia, 0.5-m Newtonian reflector)

173P/Mueller
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.13, 18.4, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

178P/Hug-Bell
Total-magnitude and coma-diameter estimates:
2020 Sep. 18.18, 18.2, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

186P/Garradd
Total-magnitude and coma-diameter estimates:
2020 Sep. 13.88, 19.0, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

215P/NEAT
Total-magnitude and coma-diameter estimates:
2020 Sep. 13.21, 17.3, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

249P/LINEAR
Total-magnitude and coma-diameter estimates:
2020 Sep. 16.13, 19.3, 0.3' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.14-deg tail in p.a. 283)
2020 Sep. 03.10, 18.9, 0.4' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.06-deg tail in p.a. 282)

254P/McNaught
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.00, 17.8, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

257P/Catalina
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.91, 16.8, 0.8' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)
2020 Sep. 09.88, 17.0, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor)

277P/LINEAR
Total-magnitude and coma-diameter estimates:
2020 Sep. 15.08, 19.3, 0.4' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)
2020 Sep. 12.04, 19.9, 0.4' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2020 Sep. 18.01, 15.7, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor; 1.4' tail in p.a. 200)
2020 Sep. 16.01, 15.5, 1.4' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.08-deg tail in p.a. 198)
2020 Sep. 15.01, 15.5, 1.6' (S. Fritsche, Koeditz, 0.1-m refractor; 2.0' tail in p.a. 189)
2020 Sep. 14.95, 15.0, 0.2' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 12.05, 15.8, 1.5' (S. Fritsche, Koeditz, 0.1-m refractor; 2.2' tail in p.a. 193)
2020 Sep. 12.00, 15.6, 1.1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.05-deg tail in p.a. 199)
2020 Sep. 11.88, 15.5, -- (G. Pappa, Trecastagni , 0.3-m reflector)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 21.84, 15.9, 0.2' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 19.86, 15.3, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 19.83, 15.8, 0.2' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 18.79, 16.0, 1.1' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 16.83, 15.7, 0.5' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 15.92, 15.2, 1.2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.4' tail in p.a. 4)
2020 Sep. 14.93, 15.4, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 14.90, 15.7, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 13.93, 15.1, 0.6' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 12.91, 15.2, 1.2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.9' tail in p.a. 8)
2020 Sep. 12.91, 13.5, 0.2' (W. Hasubick, 0.44-m Newtonian reflector)
2020 Sep. 12.79, 15.5, 1.5' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 11.96, 15.4, 1.2' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 10.90, 15.7, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 09.84, 15.6, 0.2' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 09.84, 15.0, 1.4' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 07.92, 15.6, 1.3' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 05.92, 15.3, 1.1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.5' tail in p.a. 5)
2020 Sep. 03.97, 15.7, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 02.96, 15.3, 1.1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.41, 12.4, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 11.85, 11.2, 2' (C. Labordena, Vistabella, 0.2-m Schmidt-Cassegrain)
2020 Sep. 09.84, 10.2, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Sep. 09.78, 10.5, 1.7' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 08.79, 13.4, 1.2' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 07.37, 12.0, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 05.37, 11.8, 6.1' (T. Lehmann, SSO (remote), 0.51-m Newtonian reflector; 0.4-deg tail in p.a. 348)

C/2017 Y2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 09.81, 15.5, 0.25' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2020 Sep. 13.96, 16.8, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 11.88, 16.2, -- (G. Pappa, Trecastagni , 0.3-m reflector)

C/2018 F4 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 13.20, 13.9, 0.9' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 02.82, 16.6, 0.2' (A. Pearce, Nedlands, W. Australia, 0.5-m Newtonian reflector)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2020 Sep. 21.87, 14.7, 0.5' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 20.95, 14.6, 0.6' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 19.84, 15.0, 0.3' (C. Harder, Jeersdorf, f, 215x531 binoculars)
2020 Sep. 19.84, 14.8, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 19.81, 14.1, 0.56' (H. Kiiskinen, 0.4-m Ritchey-Chretien)
2020 Sep. 18.83, 14.8, 2.2' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 18.81, 14.6, 0.8' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 17.84, 14.6, 0.8' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 16.85, 14.7, 0.6' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 15.89, 14.2, 2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.23-deg tail in p.a. 8)
2020 Sep. 14.89, 15.2, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 14.84, 14.1, 2.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 14.79, 14.6, 0.4' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 13.85, 13.9, 0.8' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 11.84, 14.3, 2' (S. Fritsche, Koeditz, 0.1-m refractor; 0.13-deg tail in p.a. 6)
2020 Sep. 11.82, 14.0, 2.2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.19-deg tail in p.a. 7)
2020 Sep. 07.93, 14.7, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)
2020 Sep. 07.83, 13.9, 3.1' (S. Fritsche, Koeditz, 0.1-m refractor; 0.14-deg tail in p.a. 6)
2020 Sep. 07.81, 14.2, 1.9' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.18-deg tail in p.a. 6)
2020 Sep. 05.98, 14.3, 1.9' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.12-deg tail in p.a. 7)
2020 Sep. 05.92, 15.4, -- (P. Carson, Fregenal de la Sierra Spain, 0.315-m Cassegrain reflector)

C/2018 U1 (Lemmon)
Total-magnitude and coma-diameter estimates:
2020 Sep. 19.82, 16.0, 0.1' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 14.81, 15.8, 0.15' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 12.88, 16.6, 0.6' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.6' tail in p.a. 41)
2020 Sep. 11.88, 16.6, 0.8' (S. Fritsche, Koeditz, 0.1-m refractor; 0.9' tail in p.a. 55)
2020 Sep. 08.87, 16.8, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.3' tail in p.a. 56)
2020 Sep. 07.85, 16.5, 0.7' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.3' tail in p.a. 47)
2020 Sep. 02.89, 16.6, 0.6' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.6' tail in p.a. 40)

C/2019 K7 (SMITH)
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.88, 15.8, 1.1' (S. Fritsche, Koeditz, 0.1-m refractor; 0.8' tail in p.a. 132)
2020 Sep. 13.94, 15.9, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 11.92, 15.1, 1.6' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 11.84, 15.7, 1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.7' tail in p.a. 140)
2020 Sep. 09.82, 15.8, 0.1' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 07.96, 16.0, 0.8' (S. Fritsche, Koeditz, 0.1-m refractor; 0.6' tail in p.a. 127)
2020 Sep. 05.87, 15.7, 0.8' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.06-deg tail in p.a. 142)

C/2019 L3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 18.96, 15.9, 0.9' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 15.05, 15.4, 1' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 15.04, 15.1, 0.9' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.8' tail in p.a. 219)
2020 Sep. 14.97, 15.1, 0.25' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 13.23, 15.1, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 13.05, 15.0, 1.2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.9' tail in p.a. 236)
2020 Sep. 12.94, 15.6, 1.1' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 11.89, 15.0, -- (G. Pappa, Trecastagni , 0.3-m reflector)
2020 Sep. 11.02, 15.4, 1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.9' tail in p.a. 240)
2020 Sep. 08.04, 15.3, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 03.02, 15.2, 0.9' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.9' tail in p.a. 224)

C/2019 O3
Total-magnitude and coma-diameter estimates:
2020 Sep. 12.00, 18.2, 0.6' (S. Fritsche, Koeditz, 0.1-m refractor)

C/2019 T2
Total-magnitude and coma-diameter estimates:
2020 Sep. 14.97, 16.2, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.6' tail in p.a. 30)
2020 Sep. 11.88, 15.7, -- (G. Pappa, Trecastagni , 0.3-m reflector)
2020 Sep. 08.00, 15.9, 0.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.6' tail in p.a. 348)

C/2019 T3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 18.05, 17.2, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 15.00, 17.0, 0.7' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.5' tail in p.a. 49)
2020 Sep. 13.00, 17.2, 0.5' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.4' tail in p.a. 59)
2020 Sep. 11.90, 16.5, -- (G. Pappa, Trecastagni , 0.3-m reflector)
2020 Sep. 11.00, 17.2, 0.6' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.4' tail in p.a. 88)
2020 Sep. 02.99, 17.3, 0.6' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)

C/2019 U6 (Lemmon)
Total-magnitude and coma-diameter estimates:
2020 Sep. 21.48, 13.0, 1.2' (S. Yoshida, 0.4-m Newtonian reflector)
2020 Sep. 20.90, 12.9, 1' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Sep. 19.88, 12.7, 1.7' (T. Karhula, Lofttjärn, Sweden, 0.453-m Newtonian reflector)
2020 Sep. 19.80, 12.9, 1.32' (H. Kiiskinen, 0.4-m Ritchey-Chretien)
2020 Sep. 18.90, 13.5, 1.5' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 17.89, 13.6, 1.5' (M. Smith, Heathwood Road, Cardiff, 0.12-m refractor)
2020 Sep. 16.92, 12.2, 2.2' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Sep. 15.82, 13.0, 2' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 15.80, 12.1, 4.9' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.15-deg tail in p.a. 185)
2020 Sep. 14.79, 12.0, 6.2' (S. Fritsche, Koeditz, 0.1-m refractor; 0.2-deg tail in p.a. 190)
2020 Sep. 14.42, 12.0, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 13.82, 13.7, 1.5' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 12.81, 11.9, 6.2' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.16-deg tail in p.a. 187)
2020 Sep. 11.87, 11.8, 1.5' (C. Labordena, Vistabella, 0.2-m Schmidt-Cassegrain)
2020 Sep. 11.80, 11.8, 6.2' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 10.82, 11.6, 8.3' (S. Fritsche, Koeditz, 0.1-m refractor; 0.27-deg tail in p.a. 189)
2020 Sep. 09.87, 10.3, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Sep. 09.85, 12.4, 2.25' (M. Smith, Heathwood Road, Cardiff, A200x120 binoculars)
2020 Sep. 09.80, 12.8, 1.1' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 09.80, 11.6, 8.6' (S. Fritsche, Koeditz, 0.1-m refractor; 0.16-deg tail in p.a. 191)
2020 Sep. 08.83, 11.6, 8.6' (S. Fritsche, Koeditz, 0.1-m refractor; 0.29-deg tail in p.a. 192)
2020 Sep. 08.40, 12.6, 1.8' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 07.95, 12.5, 1.8' (W. Kutschera, 0.54-m Newtonian reflector)
2020 Sep. 07.89, 10.2, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Sep. 07.88, 12.0, 4.9' (S. Fritsche, Koeditz, 0.1-m refractor; 0.13-deg tail in p.a. 179)
2020 Sep. 07.36, 12.5, 1.2' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 05.82, 11.7, 5.3' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.19-deg tail in p.a. 183)
2020 Sep. 02.84, 11.9, 1.1' (M. Meyer, 0.254-m Newtonian reflector)

C/2020 F3 (NEOWISE)
Total-magnitude and coma-diameter estimates:
2020 Sep. 22.40, 10.6, 3' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 14.43, 9.5, 5' (M. Mattiazzo, Swan Hill, Victoria, 25x100 binoculars)
2020 Sep. 14.43, 10.0, 3' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 13.42, 10.0, 3' (P. Camilleri, 20x80 binoculars)
2020 Sep. 12.41, 9.8, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 11.83, 9.2, 3' (C. Labordena, Vistabella, 0.2-m Schmidt-Cassegrain)
2020 Sep. 11.42, 9.5, 4' (P. Camilleri, 20x80 binoculars)
2020 Sep. 10.43, 9.3, 4' (P. Camilleri, 20x80 binoculars)
2020 Sep. 09.77, 9.6, 2.5' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 09.41, 8.9, 5' (M. Mattiazzo, Swan Hill, Victoria, 25x100 binoculars)
2020 Sep. 08.41, 9.0, 7' (C. Wyatt, 0.25-m Newtonian reflector; 36.0' tail in p.a. 59)
2020 Sep. 07.86, 8.9, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2020 Sep. 07.42, 9.2, 3' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 07.39, 8.7, 8.4' (C. Wyatt, 0.25-m Newtonian reflector; 32.0' tail in p.a. 63)
2020 Sep. 06.93, 9.5, 3' (M. Goiato, 0.22-m Newtonian reflector)
2020 Sep. 06.93, 9.2, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 06.41, 9.5, 4' (P. Camilleri, 20x80 binoculars)
2020 Sep. 05.93, 9.2, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 05.84, 8.7, 3' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2020 Sep. 05.37, 8.8, 15' (T. Lehmann, SSO (remote), 0.106-m refractor; 1.65-deg tail in p.a. 64)
2020 Sep. 05.13, 8.7, 2' (C. Hergenrother, 30x125 binoculars)
2020 Sep. 04.93, 9.1, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 03.93, 9.0, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 02.93, 8.8, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 01.92, 8.7, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Sep. 01.37, 8.6, 13' (T. Lehmann, SSO (remote), 0.106-m refractor; 1.17-deg tail in p.a. 61)
2020 Aug. 30.92, 8.3, -- (J. de Souza Aguiar, 25x100 binoculars)
2020 Aug. 29.91, 8.3, -- (J. de Souza Aguiar, 25x100 binoculars)

C/2020 J1 (SONEAR)
Total-magnitude and coma-diameter estimates:
2020 Sep. 05.55, 15.5, 0.1' (A. Pearce, Nedlands, W. Australia, 0.5-m Newtonian reflector)

C/2020 M3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 26.76, 9.4, 9' (M. Mattiazzo, Swan Hill, Victoria, 25x100 binoculars)
2020 Sep. 26.29, 10.2, 4' (M. Goiato, 0.22-m Newtonian reflector)
2020 Sep. 25.15, 10.6, 3' (J. de Souza Aguiar, 0.27-m Newtonian reflector)
2020 Sep. 24.21, 10.3, 3' (M. Goiato, 0.22-m Newtonian reflector)
2020 Sep. 24.14, 10.5, 2' (J. de Souza Aguiar, 0.27-m Newtonian reflector)
2020 Sep. 22.63, 9.4, 7.5' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 20.54, 10.3, 7' (M. Mattiazzo, Swan Hill, Victoria, 0.2-m Newtonian reflector)
2020 Sep. 16.82, 10.2, 6' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 16.05, 10.5, 5' (A. Novichonok, With Nikon D5200 (128-mm lens), 0.026-m refractor)
2020 Sep. 16.05, [10.0, -- (A. Novichonok, Simeiz observatory, +27 C, 0.2-m Newtonian reflector)
2020 Sep. 14.83, 10.4, 4' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 14.56, 10.6, 6' (M. Mattiazzo, Swan Hill, Victoria, 0.2-m Newtonian reflector)
2020 Sep. 14.05, [10.0, -- (A. Novichonok, Simeiz observatory, +27 C, 0.2-m Newtonian reflector)
2020 Sep. 13.20, 12.6, 1.9' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)
2020 Sep. 12.67, 10.6, 6' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 09.81, 11.0, 2.5' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 09.54, 10.6, 6' (M. Mattiazzo, Swan Hill, Victoria, 0.2-m Newtonian reflector)
2020 Sep. 08.50, 10.3, 6.8' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 07.81, 10.8, 2' (P. Camilleri, 0.406-m Newtonian reflector)
2020 Sep. 07.76, 14.7, 0.3' (A. Pearce, Nedlands, W. Australia, 0.5-m Newtonian reflector)
2020 Sep. 05.76, 14.8, 0.3' (A. Pearce, Nedlands, W. Australia, 0.5-m Newtonian reflector)
2020 Aug. 31.79, 10.5, 14' (T. Lehmann, SSO (remote), 0.106-m refractor)
2020 Aug. 30.73, 10.7, 13' (T. Lehmann, SSO (remote), 0.106-m refractor)
2020 Aug. 30.65, 11.4, 2' (G. van Buitenen, Siding Spring, AU (Q62), 0.127-m refractor)
2020 Aug. 29.73, 10.6, 15' (T. Lehmann, SSO (remote), 0.106-m refractor)

C/2020 N1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2020 Sep. 13.97, 18.0, 0.4' (K. Hills, Comphot version 1.2.6, 0.5-m Newtonian reflector)

C/2020 P1 (NEOWISE)
Total-magnitude and coma-diameter estimates:
2020 Sep. 25.40, 10.8, 2.5' (M. Mattiazzo, Swan Hill, Victoria, 0.07-m reflector)
2020 Sep. 24.91, 10.7, -- (J. de Souza Aguiar, 0.27-m Newtonian reflector)
2020 Sep. 23.91, 10.6, -- (J. de Souza Aguiar, 0.27-m Newtonian reflector)
2020 Sep. 23.38, 10.3, 3' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 22.39, 10.7, 2.5' (C. Wyatt, 0.25-m Newtonian reflector)
2020 Sep. 21.44, 12.3, 1.5' (M. Mattiazzo, Swan Hill, Victoria, 0.07-m reflector)
2020 Sep. 20.42, 13.2, 1.5' (M. Mattiazzo, Swan Hill, Victoria, 0.28-m Schmidt-Cassegrain)
2020 Sep. 14.42, 13.9, 1' (M. Mattiazzo, Swan Hill, Victoria, 0.28-m Schmidt-Cassegrain)
2020 Sep. 09.42, 14.6, 0.5' (M. Mattiazzo, Swan Hill, Victoria, 0.28-m Schmidt-Cassegrain)

C/2020 Q1 (Borisov)
Total-magnitude and coma-diameter estimates:
2020 Sep. 19.99, 13.7, 1.8' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 18.88, 11.1, 5.9' (M. Lostak, 0.2-m Newtonian reflector)
2020 Sep. 18.78, 15.2, 1' (V. Bahyl, observatory "Júlia", Zvolenská Slatina, Slovak Republic, Europe, 0.2359-m Schmidt-Cassegrain; 2.0' tail in p.a. 90)
2020 Sep. 18.05, 12.1, 9.1' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 17.91, 13.4, 1.8' (C. Harder, Jeersdorf, f, 0.531-m Newtonian reflector)
2020 Sep. 15.13, 12.0, 8.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 15.12, 12.3, 6.5' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.0' tail in p.a. 244)
2020 Sep. 14.99, 12.5, 1.3' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 13.09, 12.7, 6.1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.7' tail in p.a. 233)
2020 Sep. 12.13, 12.9, 4.7' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 12.08, 12.5, 7.1' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.3' tail in p.a. 233)
2020 Sep. 12.02, 11.3, 4' (C. Labordena, Vistabella, 0.2-m Schmidt-Cassegrain)
2020 Sep. 11.89, 13.0, -- (G. Pappa, Trecastagni , 0.3-m reflector)
2020 Sep. 11.08, 12.7, 6.5' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 1.3' tail in p.a. 239)
2020 Sep. 09.94, 10.1, 7' (J. Gonzalez Suarez, Alto del Castro, 1720 m, Leon, Spain, 0.203-m Schmidt-Cassegrain)
2020 Sep. 09.85, 13.4, 0.7' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2020 Sep. 08.08, 12.9, 5.5' (S. Fritsche, Koeditz, 0.1-m refractor)
2020 Sep. 07.94, 12.9, 5.3' (T. Lehmann, Weimar, 0.279-m Newtonian reflector; 0.9' tail in p.a. 234)
2020 Sep. 07.92, 10.8, 2.5' (J. Gonzalez Suarez, Alto del Castro, 1720 m, Leon, Spain, 0.203-m Schmidt-Cassegrain)
2020 Sep. 03.06, 12.7, 5.5' (T. Lehmann, Weimar, 0.279-m Newtonian reflector)
2020 Aug. 31.98, 15.5, 1' (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien; 0.5' tail in p.a. 260)