COBS - Comet OBServation database

Recent Comet Brightness Estimates

4P/Faye
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 21.12, 19.2, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

12P/Pons-Brooks
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 26.05, 18.5, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Newtonian + CCD); 21.35, 18.5, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD); 18.79, 18.8, -- (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);

19P/Borrelly
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 16.25, 19.6, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD; 4' tail in p.a. 305 deg); 15.25, 19.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 27.91, 14.2, 2' (P. Dekelver, 0.3-m Newtonian + CCD); 25.85, 16.2, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 22.87, 16.3, 0.34' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD); 22.80, 16.3, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 21.89, 13.0, 4.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 18.84, 13.8, 2.5' (P. Lívanec, 0.102-m Refractor + CCD); 18.81, 16.4, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 17.97, 13.3, 3.01' (K. Hills, 0.5-m Newtonian + CCD); 16.86, 12.6, 3' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 15.89, 12.3, 5.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 15.85, 12.7, 4.7' (K. Hills, 0.5-m Newtonian + CCD); 14.89, 12.5, 5.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 13.94, 13.3, 1.5' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 12.89, 13.3, 2' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 11.97, 16.0, 0.56' (K. Hills, 0.5-m Newtonian + CCD); 05.86, 14.0, 2' (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD); feb 28.81, 13.2, 2' (P. Dekelver, 0.3-m Newtonian + CCD);

44P/Reinmuth
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 14.89, 19.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

48P/Johnson
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 27.27, 20.7, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD); 21.22, 21.3, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

61P/Shajn-Schaldach
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 15.87, 19.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

65P/Gunn
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 12.06, 18.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

77P/Longmore
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.05, 14.2, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 1' tail in p.a. 307 deg); 24.15, 14.9, 0.75' (K. Hills, 0.5-m Newtonian + CCD); 18.65, 14.9, 0.8' (C. Wyatt, 0.4-m Newtonian); 18.09, 15.7, 0.29' (S. Shurpakov, 0.41-m Newtonian + CCD); 16.47, 15.1, 0.3' (C. Wyatt, 0.4-m Newtonian); 16.10, 15.0, 0.75' (K. Hills, 0.5-m Newtonian + CCD); 15.49, 14.9, 0.5' (C. Wyatt, 0.4-m Newtonian); 15.04, 15.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 03.93, 15.4, 0.4' (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD); 03.16, 15.5, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 02.14, 15.3, 1' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.4' tail in p.a. 292 deg); 01.18, 15.3, 0.9' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 01.14, 15.1, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 1' tail in p.a. 304 deg);

80P/Peters-Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 21.40, 17.9, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

81P/Wild
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.11, 13.6, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 22.11, 13.6, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 21.77, 12.6, 1' (O. Miyazaki, 0.32-m Newtonian); 19.80, 12.6, 0.7' (O. Miyazaki, 0.32-m Newtonian); 19.10, 13.5, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 18.80, 12.1, 0.5' (O. Miyazaki, 0.32-m Newtonian); 18.68, 13.9, 0.6' (C. Wyatt, 0.4-m Newtonian; 2.8' tail in p.a. 270 deg); 17.09, 13.3, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 16.16, 12.8, 2.3' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.05° tail in p.a. 271 deg); 02.01, 12.0, 0.5' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD; 5' tail); 01.20, 11.3, 5.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); feb 28.76, 12.6, 1.5' (K. Harikae, 0.15-m Newtonian + CCD);

89P/Russell
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.91, 20.3, -- (G. Pappa, Piemonte,Italy (remote control), 0.3-m Newtonian + CCD); 21.30, 20.9, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

94P/Russell
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.01, 17.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 12.91, 18.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 05.85, 16.9, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

96P/Machholz
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 21.38, 15.6, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD); 08.15, 14.2, 1' (G. Pappa, Namibia (remote control), 0.36-m Ritchey-Chretien + CCD); 07.15, 14.0, 1' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 03.16, 13.5, 1' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); feb 28.80, 11.7, 1.8' (K. Harikae, 0.15-m Newtonian + CCD);

99P/Kowal
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 20.19, 17.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

107P/Wilson-Harrington
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 12.86, 19.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

113P/Spitaler
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 12.93, 19.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

118P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 27.94, 15.1, 1.2' (P. Dekelver, 0.3-m Newtonian + CCD); 25.86, 16.3, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 24.90, 15.2, 1.5' (K. Hills, 0.5-m Newtonian + CCD); 22.81, 16.3, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 16.85, 14.2, 1.5' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 15.92, 13.6, 4.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.08° tail in p.a. 269 deg); 14.91, 15.0, 1.5' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 12.89, 14.3, 1.2' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 11.95, 13.9, 3' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 1.8' tail in p.a. 239 deg); 11.92, 13.8, 3.7' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.09° tail in p.a. 268 deg); 10.89, 16.3, 0.56' (K. Hills, 0.5-m Newtonian + CCD); 07.86, 15.5, 0.3' (D. Heggie, Edinburgh, 0.13-m Newtonian + CCD); 02.82, 15.0, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.80, 14.0, 2' (P. Dekelver, 0.3-m Newtonian + CCD); feb 28.89, 14.0, 2' (P. Dekelver, 0.3-m Newtonian + CCD); 28.87, 13.2, 4.3' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.06° tail in p.a. 266 deg);

119P/Parker-Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 25.84, 16.0, 0.1' (S. Szabo, Agfalva, 0.6-m Newtonian); 23.90, 16.0, 0.94' (K. Hills, 0.5-m Newtonian + CCD); 15.91, 16.2, 0.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 12.91, 15.4, 0.8' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 09.99, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 08.94, 17.0, 0.44' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD); 05.86, 15.4, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);

129P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.83, 18.5, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Newtonian + CCD); 01.08, 19.3, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

169P/NEAT
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 21.16, 19.8, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

179P/Jedicke
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 10.87, 19.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

180P/NEAT
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 11.02, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

199P/Shoemaker
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 05.16, 17.2, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);

204P/LINEAR-NEAT
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 23.02, 18.5, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 15.99, 16.6, 0.9' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 12.95, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 02.07, 16.9, 0.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 01.93, 16.4, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.01, 16.3, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD);

211P/Hill
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.05, 19.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 16.15, 18.6, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD); 13.99, 18.5, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

219P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 04.27, 18.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

237P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 25.12, 12.8, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD); 22.18, 12.6, 0.9' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 18.69, 13.9, 0.2' (C. Wyatt, 0.4-m Newtonian); 02.04, 14.0, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

244P/Scotti
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.85, 18.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 22.79, 17.8, 0.34' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD); 19.85, 17.7, 0.33' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD); 12.91, 15.9, 0.5' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD);

256P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.20, 20.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 01.30, 19.7, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

263P/Gibbs
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 20.20, 17.3, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD; 1' tail in p.a. 185 deg); 18.68, 17.1, 0.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 0.5' tail in p.a. 255 deg); 17.99, 17.2, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD); 16.03, 17.2, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 14.04, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 03.00, 16.2, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 02.02, 16.3, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.10, 16.5, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 0.7' tail in p.a. 270 deg); 01.07, 17.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

299P/Catalina-PANSTARRS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 22.98, 19.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 12.96, 19.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

364P/PANSTARRS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.09, 13.7, 2' (P. Dekelver, 0.3-m Newtonian + CCD; 2.5' tail in p.a. 252 deg); 27.12, 13.9, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Newtonian + CCD); 27.03, 12.6, 2.5' (J. Gonzalez Suarez, Alto del Trichero, 1190 m, Leon, Spain, 0.203-m Schmidt-Cassegrain); 25.93, 14.3, 0.3' (S. Szabo, Agfalva, 0.6-m Newtonian); 25.90, 14.9, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 18.75, 15.1, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 1.6' tail in p.a. 255 deg); 18.66, 15.0, 0.3' (C. Wyatt, 0.4-m Newtonian); 17.94, 15.9, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD; 2.3' tail in p.a. 257 deg); 16.00, 15.0, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.05° tail in p.a. 254 deg); 15.00, 15.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 14.05, 15.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 12.11, 15.5, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 1.7' tail in p.a. 257 deg); 02.04, 16.4, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 0.7' tail in p.a. 265 deg); 01.12, 16.8, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 0.6' tail in p.a. 274 deg); 01.08, 16.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

402P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 23.99, 18.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 12.07, 18.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

408P/Novichonok-Gerke
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 04.87, 16.9, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);

423P/Lemmon
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 27.14, 22.5, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

451P/Christensen
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 01.11, 19.7, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);

452P/Sheppard-Jewitt
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 23.01, 19.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 20.11, 19.5, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD; 2.5' tail in p.a. 205 deg); 12.97, 19.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2014 UN271 (Bernardinelli-Bernstein)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 11.76, 17.4, 0.2' (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 23.92, 9.4, 2' (J. de Souza Aguiar, 25x100 Binoculars); 21.93, 9.4, 2' (J. de Souza Aguiar, 25x100 Binoculars); 19.94, 9.3, 2' (A. Amorim, 0.09-m Refractor); 19.93, 9.3, 2' (J. de Souza Aguiar, 25x100 Binoculars); 18.94, 9.1, 2' (A. Amorim, 0.09-m Refractor); 18.92, 9.3, 2' (J. de Souza Aguiar, 25x100 Binoculars); 18.43, 9.1, 7.5' (C. Wyatt, 15x70 Binoculars; 15' tail in p.a. 214 deg); 17.99, 9.0, -- (A. Amorim, 0.09-m Refractor); 16.95, 9.0, 2' (A. Amorim, 0.09-m Refractor); 16.92, 9.2, 2' (J. de Souza Aguiar, 25x100 Binoculars); 16.40, 9.2, 9' (C. Wyatt, 15x70 Binoculars; 21' tail in p.a. 199 deg); 15.39, 8.9, 8.5' (C. Wyatt, 15x70 Binoculars); 14.04, 9.0, -- (A. Amorim, 0.09-m Refractor); 12.80, 9.0, 3' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD; 30' tail); 11.95, 9.0, 2' (A. Amorim, 0.09-m Refractor); 10.77, 8.8, 16' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.85° tail in p.a. 214 deg); 06.93, 8.7, 3' (J. de Souza Aguiar, 25x100 Binoculars); 02.78, 8.7, 13' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.81° tail in p.a. 220 deg); feb 28.96, 8.9, 2' (A. Amorim, 0.09-m Refractor); 28.78, 8.6, 3' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD; 21' tail);

C/2019 E3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 05.84, 16.8, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

C/2019 K7 (SMITH)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.17, 18.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 16.18, 18.7, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD); 12.12, 18.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2019 L3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 23.99, 12.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 21.99, 11.9, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 19.52, 11.3, 0.9' (O. Miyazaki, 0.32-m Newtonian); 18.98, 11.8, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 18.45, 12.0, 2' (C. Wyatt, 0.4-m Newtonian); 16.98, 11.7, 2' (J. de Souza Aguiar, 0.3-m Newtonian); 16.46, 12.0, 2.3' (C. Wyatt, 0.4-m Newtonian); 15.97, 11.9, 1.7' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 15.53, 10.9, 0.9' (O. Miyazaki, 0.32-m Newtonian); 15.46, 11.9, 2.6' (C. Wyatt, 0.4-m Newtonian); 14.54, 11.0, 0.9' (O. Miyazaki, 0.32-m Newtonian); 11.98, 12.6, 1.5' (K. Hills, 0.5-m Newtonian + CCD); 11.82, 11.4, 5.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.24° tail in p.a. 339 deg); 05.61, 12.5, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 01.90, 11.7, 2' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

C/2019 O3
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 20.20, 17.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 10.24, 17.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 03.17, 17.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2019 T4 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.07, 12.6, 4' (P. Dekelver, 0.3-m Newtonian + CCD; 14.2' tail in p.a. 241 deg); 26.95, 12.7, 1' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 25.94, 13.7, 0.6' (S. Szabo, Agfalva, 0.6-m Newtonian); 24.17, 12.3, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 21.75, 13.2, 0.8' (O. Miyazaki, 0.32-m Newtonian); 19.79, 12.9, 0.7' (O. Miyazaki, 0.32-m Newtonian); 19.18, 12.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 19.12, 11.8, 1.8' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 18.79, 12.2, 1.1' (O. Miyazaki, 0.32-m Newtonian); 18.67, 13.0, 1.9' (C. Wyatt, 0.4-m Newtonian); 18.00, 14.0, 0.48' (S. Shurpakov, 0.41-m Newtonian + CCD; 6' tail in p.a. 242 deg); 16.13, 13.1, 1.5' (K. Hills, 0.5-m Newtonian + CCD); 16.09, 12.7, 4.9' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.18° tail in p.a. 240 deg); 16.05, 13.1, 1.7' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 03.02, 12.9, 2' (P. Dekelver, 0.3-m Newtonian + CCD); 02.10, 12.8, 0.75' (K. Hills, 0.5-m Newtonian + CCD); 02.06, 12.7, 4' (P. Dekelver, 0.3-m Newtonian + CCD; 11.4' tail in p.a. 241 deg); 01.99, 12.5, 1' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 01.22, 13.6, 0.9' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 01.16, 13.0, 2' (P. Dekelver, 0.3-m Newtonian + CCD; 9.4' tail in p.a. 244 deg); feb 28.81, 12.6, 0.8' (O. Miyazaki, 0.32-m Newtonian); 28.75, 13.2, 2' (K. Harikae, 0.15-m Newtonian + CCD);

C/2019 U5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.02, 11.9, 4' (P. Dekelver, 0.3-m Newtonian + CCD; 11.6' tail in p.a. 48 deg); 27.08, 10.3, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain); 26.94, 11.4, 2' (C. Harder, Jeersdorf f, 0.298-m Newtonian; 4' tail in p.a. 45 deg); 25.96, 11.5, 1.5' (V. Díaz, La Romana, Alicante, Spain, 0.25-m Newtonian); 25.92, 12.4, 1' (S. Szabo, Agfalva, 0.6-m Newtonian); 25.88, 14.4, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 24.83, 11.5, 2.7' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 24.14, 12.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 23.92, 12.9, 0.8' (M. Dionisi, Sassari, 0.25-m Newtonian + CCD; 6' tail in p.a. 45 deg); 22.79, 12.7, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD); 22.13, 12.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 21.17, 11.6, 1.5' (M. Goiato, 0.22-m Newtonian); 19.84, 11.0, 1.5' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 19.55, 11.9, 0.9' (O. Miyazaki, 0.32-m Newtonian); 19.14, 11.9, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 19.10, 11.5, 2' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 18.83, 11.8, 0.8' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 18.66, 12.4, 1.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 15' tail in p.a. 43 deg); 18.44, 12.2, 1.5' (C. Wyatt, 0.4-m Newtonian; 5.6' tail in p.a. 53 deg); 18.07, 13.2, 0.72' (S. Shurpakov, 0.41-m Newtonian + CCD; 7.7' tail in p.a. 57 deg); 17.97, 11.5, 0.7' (M. Kwinta, 0.3-m Newtonian); 17.78, 12.2, 1' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 17.13, 11.8, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 16.46, 12.1, 1.3' (C. Wyatt, 0.4-m Newtonian); 16.05, 12.0, 4.9' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.18° tail in p.a. 44 deg); 15.89, 10.5, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain); 15.55, 11.7, 1.3' (O. Miyazaki, 0.32-m Newtonian); 15.45, 12.2, 2' (C. Wyatt, 0.4-m Newtonian); 14.98, 12.2, 1.7' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 14.55, 11.8, 1.5' (O. Miyazaki, 0.32-m Newtonian); 14.00, 12.0, 2.44' (K. Hills, 0.5-m Newtonian + CCD); 12.08, 12.1, 3.5' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.09° tail in p.a. 45 deg); 07.17, 11.4, 1' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 02.97, 11.8, 4' (P. Dekelver, 0.3-m Newtonian + CCD; 7.2' tail in p.a. 40 deg); 02.10, 12.4, 3.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.11° tail in p.a. 43 deg); 01.98, 11.6, 4' (P. Dekelver, 0.3-m Newtonian + CCD; 9.4' tail in p.a. 41 deg); 01.16, 12.5, 2.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 01.05, 12.0, 4' (P. Dekelver, 0.3-m Newtonian + CCD; 7.2' tail in p.a. 38 deg); feb 28.97, 12.6, 2.4' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.15° tail in p.a. 39 deg); 28.80, 11.7, 0.8' (O. Miyazaki, 0.32-m Newtonian); 28.75, 11.9, 2' (K. Harikae, 0.15-m Newtonian + CCD);

C/2020 F2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.14, 17.5, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 14.03, 17.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 01.06, 17.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2020 H6 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 20.22, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 10.26, 18.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2020 J1 (SONEAR)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.03, 19.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 12.08, 19.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2020 K1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.28, 13.1, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 19.28, 12.9, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 18.69, 13.3, 0.9' (C. Wyatt, 0.4-m Newtonian); 17.27, 12.7, 1' (J. de Souza Aguiar, 0.3-m Newtonian); 05.17, 12.0, 1' (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD); 02.14, 13.2, 1.8' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.04° tail in p.a. 337 deg);

C/2020 R7 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.11, 15.2, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 22.16, 15.9, 0.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 20.26, 15.1, 0.94' (K. Hills, 0.5-m Newtonian + CCD); 18.06, 16.5, 0.29' (S. Shurpakov, 0.41-m Newtonian + CCD); 02.13, 15.6, 0.9' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1.9' tail in p.a. 183 deg);

C/2020 S4 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.00, 14.7, 2' (P. Dekelver, 0.3-m Newtonian + CCD); 25.86, 15.5, 0.3' (S. Szabo, Agfalva, 0.6-m Newtonian); 22.98, 16.4, 0.56' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD); 15.96, 14.4, 2.1' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 2.4' tail in p.a. 262 deg); 14.94, 15.7, 0.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 12.94, 15.4, 0.56' (K. Hills, 0.5-m Newtonian + CCD); 12.90, 14.8, 1' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 11.99, 15.4, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 2' tail in p.a. 261 deg); 02.88, 14.4, 1.6' (P. Dekelver, 0.3-m Newtonian + CCD); 02.03, 15.1, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 01.87, 14.5, 1.6' (P. Dekelver, 0.3-m Newtonian + CCD); 01.84, 15.1, 1.5' (M. Lošťák, 0.2-m Newtonian + CCD); feb 28.94, 14.6, 2' (P. Dekelver, 0.3-m Newtonian + CCD);

C/2020 V2 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 26.86, 9.8, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain); 25.80, 10.3, 1.8' (S. Szabo, Agfalva, 0.6-m Newtonian); 24.83, 10.0, 2.8' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 22.77, 9.5, 1.3' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 19.82, 9.8, 2.7' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 18.83, 9.5, 5.2' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD; 10' tail in p.a. 22 deg); 18.79, 9.4, 2' (U. Pilz, 0.32-m Newtonian; 0.07° tail in p.a. 50 deg); 18.77, 10.4, 1.8' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 17.80, 10.5, 1.1' (M. Kwinta, 0.3-m Newtonian); 17.79, 12.3, 0.58' (S. Shurpakov, 0.41-m Newtonian + CCD; 5.6' tail in p.a. 30 deg); 17.77, 10.3, 1.8' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 16.87, 10.2, 2' (V. Díaz, La Romana, Alicante, Spain, 0.15-m Newtonian); 16.85, 10.5, 1' (M. Filipek, 0.4-m Newtonian); 16.84, 10.4, 3' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD; 7.2' tail in p.a. 23 deg); 16.81, 10.2, 1.2' (M. Kwinta, 0.3-m Newtonian); 16.80, +11.3, 3' (V. Bahyl, Julia Observatory, Zvolenská Slatina, Slovakia, Europe, 0.254-m Schmidt-Cassegrain + CCD; 3' tail in p.a. 90 deg); 15.89, 10.3, 2.3' (W. Kutschera, 0.08-m Refractor; 4.8' tail); 15.85, 9.7, 3.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.1° tail in p.a. 20 deg); 15.84, 10.1, 5.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 15.84, 9.7, 12' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.19° tail in p.a. 20 deg); 15.82, 10.0, 2' (C. Harder, Jeersdorf f, 0.353-m Newtonian); 15.42, 10.9, 1.2' (O. Miyazaki, 0.32-m Newtonian); 14.85, 10.2, 6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 14.84, 10.5, 6' (P. Dekelver, 0.3-m Newtonian + CCD; 12.8' tail in p.a. 19 deg); 14.83, 10.2, 2' (A. Scholten, Eerbeek, 0.2-m Newtonian); 14.42, 10.3, 1.3' (O. Miyazaki, 0.32-m Newtonian); 13.86, 10.6, 2.4' (P. Dekelver, 0.3-m Newtonian + CCD; 7.2' tail in p.a. 20 deg); 12.88, 10.3, 3' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD; 5.2' tail in p.a. 22 deg); 11.83, 9.9, 2' (C. Harder, Jeersdorf f, 0.353-m Newtonian); 11.83, 9.8, 9.2' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.31° tail in p.a. 23 deg); 11.42, 10.4, 1.4' (O. Miyazaki, 0.32-m Newtonian); 10.87, 9.2, 2.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain); 10.81, 10.6, 2' (C. Labordena, Atzaneta, 0.2-m Schmidt-Cassegrain); 10.42, 10.6, 0.9' (O. Miyazaki, 0.32-m Newtonian); 08.73, 11.8, 1.11' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD; 3.9' tail in p.a. 20 deg); 03.75, 10.4, 1.2' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 02.87, 9.8, 7.5' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.12° tail in p.a. 20 deg); 01.86, 9.4, 10' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.16° tail in p.a. 20 deg); 01.80, 10.2, 7.3' (M. Lošťák, 0.2-m Newtonian + CCD); 01.72, 10.7, 0.53' (S. Shurpakov, 0.41-m Newtonian); feb 28.88, 10.3, 1.5' (M. Filipek, 0.4-m Newtonian); 28.82, 9.7, 9.6' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.23° tail in p.a. 23 deg); 28.81, 10.4, 1.7' (M. Kwinta, 0.3-m Newtonian);

C/2021 E3 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 22.85, 17.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 20.85, 17.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 09.87, 17.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD); feb 28.84, 15.5, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD);

C/2021 G2 (Atlas)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 13.84, 15.7, 0.7' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1.2' tail in p.a. 302 deg);

C/2021 QM45 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 12.89, 19.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2021 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 18.42, 14.6, 0.7' (C. Wyatt, 0.4-m Newtonian); 16.45, 14.7, 0.7' (C. Wyatt, 0.4-m Newtonian); 15.42, 14.9, 0.3' (C. Wyatt, 0.4-m Newtonian); 11.80, 15.0, 0.9' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.9' tail in p.a. 354 deg);

C/2021 X1 (Maury-Attard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 11.77, 15.3, 1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.06° tail in p.a. 104 deg);

C/2021 Y1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 18.42, 14.6, 0.9' (C. Wyatt, 0.4-m Newtonian); 16.40, 14.6, 1.2' (C. Wyatt, 0.4-m Newtonian); 15.40, 14.6, 0.7' (C. Wyatt, 0.4-m Newtonian); 12.82, 13.9, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 11.78, 12.5, 6.6' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 2.4' tail in p.a. 17 deg); 02.80, 12.6, 6' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD); feb 28.79, 13.0, 0.7' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

C/2022 A2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.14, 10.4, 6' (P. Dekelver, 0.3-m Newtonian + CCD; 11.3' tail in p.a. 353 deg); 28.14, 9.8, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian); 26.85, 9.4, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain); 25.79, 11.2, 0.6' (S. Szabo, Agfalva, 0.6-m Newtonian); 24.82, 10.0, 2.5' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 22.78, 11.0, 1' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 22.20, 9.9, 5.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 21.79, 11.2, 0.8' (O. Miyazaki, 0.32-m Newtonian); 19.82, 10.1, 2.8' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 19.80, 10.5, 0.8' (O. Miyazaki, 0.32-m Newtonian); 19.19, 8.7, 4' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD; 16' tail in p.a. 353 deg); 18.81, 10.5, 1.5' (O. Miyazaki, 0.32-m Newtonian); 18.79, 10.7, 1.5' (U. Pilz, 0.32-m Newtonian); 18.77, 10.3, 2' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 17.80, 11.5, 0.82' (S. Shurpakov, 0.41-m Newtonian + CCD; 2.5' tail in p.a. 356 deg); 17.79, 10.1, 1' (M. Kwinta, 0.3-m Newtonian); 16.84, 10.4, 3' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD; 6.9' tail in p.a. 351 deg); 16.77, 10.4, 0.8' (M. Kwinta, 0.3-m Newtonian); 15.83, 9.3, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain); 15.81, 9.8, 2.5' (C. Harder, Jeersdorf f, 0.353-m Newtonian); 12.88, 10.3, 3' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD; 6.6' tail in p.a. 352 deg); 12.15, 9.4, 9.9' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.23° tail in p.a. 354 deg); 11.83, 9.7, 2' (C. Harder, Jeersdorf f, 0.353-m Newtonian); 11.78, 9.5, 9.9' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.87° tail in p.a. 353 deg); 10.85, 9.0, 2.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain); 03.79, 10.8, 1' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 02.89, 10.4, 2' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD; 2.4' tail in p.a. 346 deg); 02.78, 9.3, 11' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.25° tail in p.a. 355 deg); 02.16, 10.2, 6.4' (M. Lošťák, 0.2-m Newtonian + CCD); 01.78, 9.3, 9.7' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.35° tail in p.a. 352 deg); feb 28.83, 9.9, 1.7' (O. Miyazaki, 0.32-m Newtonian); 28.80, 9.4, 8.4' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.42° tail in p.a. 351 deg); 28.76, 10.3, 1.7' (K. Harikae, 0.15-m Newtonian + CCD; 2.5' tail in p.a. 300 deg); 28.76, 9.5, 8.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.14° tail in p.a. 355 deg);

C/2022 A3 (Lemmon-ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 27.96, 15.5, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 22.92, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 15.89, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 13.91, 9.8, 4.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 10.90, 16.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 06.13, 17.9, 0.38' (N. James, 0.28-m Schmidt-Cassegrain + CCD); 05.87, 15.7, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 02.86, 16.1, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.97, 16.4, 0.7' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 01.84, 16.0, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 0.3' tail in p.a. 35 deg); feb 28.91, 14.2, 0.4' (P. Dekelver, 0.3-m Newtonian + CCD);

C/2022 E2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 27.98, 15.4, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 22.94, 16.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 11.99, 16.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 05.87, 15.4, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 05.64, 16.0, 0.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 02.93, 15.2, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.91, 15.5, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); feb 28.98, 15.5, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 28.92, 15.8, 0.6' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.2' tail in p.a. 90 deg);

C/2022 E3 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 26.87, 9.9, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain); 25.81, 10.6, 1.6' (S. Szabo, Agfalva, 0.6-m Newtonian); 24.81, 10.7, 2' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 23.93, 10.3, 2' (J. de Souza Aguiar, 0.3-m Newtonian); 22.77, 9.8, 1.8' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 21.94, 10.2, 2' (J. de Souza Aguiar, 0.3-m Newtonian); 21.87, 10.2, 4.5' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 20.89, 10.0, 5.26' (K. Hills, 0.5-m Newtonian + CCD); 19.94, 9.5, 2' (A. Amorim, 0.09-m Refractor); 19.81, 9.6, 2.5' (C. Harder, Jeersdorf f, 0.298-m Newtonian); 19.47, 10.1, 1.3' (O. Miyazaki, 0.32-m Newtonian); 18.94, 9.3, 2' (A. Amorim, 0.09-m Refractor); 18.93, 10.2, 2' (J. de Souza Aguiar, 0.3-m Newtonian); 18.80, 10.8, 2.5' (P. Lívanec, 0.102-m Refractor + CCD; 2.2' tail in p.a. 79 deg); 18.79, 10.2, 2' (M. Mašek, 0.2-m Newtonian); 18.78, 10.3, 1.8' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 18.46, 9.4, 2.8' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 18.45, 10.6, 4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 18.45, 9.9, 4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 11' tail in p.a. 55 deg); 18.44, 9.3, 7.5' (C. Wyatt, 15x70 Binoculars); 17.99, 9.3, 2' (A. Amorim, 0.09-m Refractor); 17.78, 10.3, 1.2' (M. Kwinta, 0.3-m Newtonian); 17.78, 10.4, 2' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 17.76, 10.5, 0.91' (S. Shurpakov, 0.41-m Newtonian + CCD; 6.4' tail in p.a. 56 deg); 16.95, 9.2, 2' (A. Amorim, 0.09-m Refractor); 16.93, 10.1, 2' (J. de Souza Aguiar, 0.3-m Newtonian); 16.85, 9.8, 2' (V. Díaz, La Romana, Alicante, Spain, 20x80 Binoculars); 16.83, 10.5, 1' (M. Filipek, 0.4-m Newtonian); 16.78, 10.1, 1.1' (M. Kwinta, 0.3-m Newtonian); 16.44, 9.3, 5.5' (C. Wyatt, 15x70 Binoculars); 15.87, 9.8, 8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 15.86, 9.4, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2° tail in p.a. 60 deg); 15.86, 9.9, 3.6' (W. Kutschera, 0.08-m Refractor; 0.92° tail); 15.83, 8.9, 5.5' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD; 30' tail in p.a. 33 deg); 15.81, 10.0, 2.7' (V. Kasten, 0.2-m Newtonian); 15.81, 9.9, 2.8' (C. Harder, Jeersdorf f, 0.353-m Newtonian; 6' tail in p.a. 77 deg); 15.80, 8.9, 19' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.49° tail in p.a. 34 deg); 15.43, 10.6, 1.2' (O. Miyazaki, 0.32-m Newtonian; 2.8' tail in p.a. 83 deg); 15.40, 9.6, 7' (C. Wyatt, 15x70 Binoculars); 14.87, 9.8, 8.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 14.85, 10.4, 5.26' (K. Hills, 0.5-m Newtonian + CCD); 14.83, 10.0, 6' (P. Dekelver, 0.3-m Newtonian + CCD; 17.2' tail in p.a. 36 deg); 14.81, 9.6, 2' (A. Scholten, Eerbeek, 0.2-m Newtonian); 14.43, 10.6, 1.3' (O. Miyazaki, 0.32-m Newtonian; 2.3' tail in p.a. 67 deg); 13.85, 9.6, 8' (P. Dekelver, 0.3-m Newtonian + CCD); 11.96, 9.1, 4' (A. Amorim, 0.09-m Refractor); 11.82, 8.8, 3.5' (C. Harder, Jeersdorf f, 0.353-m Newtonian; 4.5' tail in p.a. 77 deg); 11.81, 9.5, 3' (V. Kasten, 0.113-m Newtonian); 11.80, 9.0, 13' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.77° tail in p.a. 39 deg); 11.77, 9.6, 2' (U. Pilz, 0.105-m Refractor; 0.07° tail in p.a. 80 deg); 11.43, 9.5, 2.5' (O. Miyazaki, 0.32-m Newtonian); 10.83, 9.9, 4' (C. Labordena, Atzaneta, 0.2-m Schmidt-Cassegrain); 10.78, 8.9, 12' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.89° tail in p.a. 41 deg); 10.43, 10.1, 1.8' (O. Miyazaki, 0.32-m Newtonian); 09.90, 10.6, 1.13' (K. Hills, 0.5-m Newtonian + CCD); 09.86, 10.8, 3' (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD); 06.95, 9.9, 2' (J. de Souza Aguiar, 0.3-m Newtonian); 05.84, 8.5, 3' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 05.49, 8.5, 2.8' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 12' tail in p.a. 50 deg); 05.49, 9.8, 4.6' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 12' tail in p.a. 50 deg); 05.48, 9.0, 4.6' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 12' tail in p.a. 50 deg); 04.81, 9.8, 5' (J. Navarro Pina, Puerto de la Cadena ( Murcia , Spain ), 20x80 Binoculars); 04.81, 8.5, 12' (T. Lehmann, Felizzano (remote), 0.2-m Newtonian + CCD; 0.41° tail in p.a. 38 deg); 04.79, 9.8, 3.5' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 03.76, 9.8, 4' (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain); 02.84, 8.4, 14' (P. Dekelver, 0.3-m Newtonian + CCD); 02.83, 8.2, 16' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.38° tail in p.a. 27 deg); 02.78, 8.4, 11' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.7° tail in p.a. 34 deg); 01.82, 8.8, 12' (P. Dekelver, 0.3-m Newtonian + CCD); 01.82, 8.1, 17' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.24° tail in p.a. 29 deg); 01.82, 9.5, 9.2' (M. Lošťák, 0.2-m Newtonian + CCD); feb 28.95, 8.3, 5' (A. Amorim, 0.09-m Refractor); 28.90, 9.0, 2' (M. Filipek, 0.4-m Newtonian); 28.85, 7.7, 19' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.25° tail in p.a. 35 deg); 28.82, 8.1, 7' (C. Labordena, Benlloch, 11x80 Binoculars); 28.81, 8.4, 5' (V. Kasten, 20x80 Binoculars); 28.80, 9.5, 10' (J. Navarro Pina, Puerto de la Cadena ( Murcia , Spain ), 20x80 Binoculars); 28.79, 8.6, 2' (M. Kwinta, 0.3-m Newtonian); 28.79, 7.9, 2' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD; 5' tail); 28.77, 8.3, 12' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.63° tail in p.a. 37 deg); 28.76, 8.6, 10.6' (P. Lívanec, 0.028-m Camera lens + CCD; 6.9' tail in p.a. 51 deg);

C/2022 L2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 28.16, 16.1, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD); 16.12, 16.9, 0.5' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 05.12, 16.0, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD); 04.22, 17.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 02.11, 16.6, 0.4' (P. Dekelver, 0.3-m Newtonian + CCD);

C/2022 P1 (NEOWISE)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 14.13, 12.9, 4.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);

C/2022 QE78 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
feb 28.79, 17.0, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

C/2022 U2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 20.88, 16.0, 0.94' (K. Hills, 0.5-m Newtonian + CCD); 15.88, 12.2, 6.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 13.86, 15.4, 0.94' (K. Hills, 0.5-m Newtonian + CCD); 12.90, 14.4, 1.2' (H. Kiiskinen, 0.4-m Ritchey-Chretien + CCD); 11.88, 12.5, 4.6' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD); 08.84, 15.8, 0.55' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD); 02.80, 14.4, 1.2' (P. Dekelver, 0.3-m Newtonian + CCD); 01.78, 14.8, 1' (P. Dekelver, 0.3-m Newtonian + CCD); feb 28.79, 12.0, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD); 28.77, 13.6, 1.6' (P. Dekelver, 0.3-m Newtonian + CCD);

C/2022 U4 (Bok)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 14.95, 18.1, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);

C/2022 W2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 22.88, 18.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 13.94, 18.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2022 W3 (Leonard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 20.87, 17.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

C/2023 A1 (Leonard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 25.89, 16.2, 0.1' (S. Szabo, Agfalva, 0.6-m Newtonian); 18.54, 16.7, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 17.87, 16.5, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD); 15.93, 16.3, 0.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 12.03, 15.8, 1' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 04.87, 16.4, 0.3' (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD); 02.91, 15.7, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.90, 16.6, 0.5' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 01.89, 16.1, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.14, 17.1, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); feb 28.96, 15.8, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD; 0.6' tail in p.a. 131 deg);

C/2023 A2 (SWAN)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 02.15, 13.2, 2' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);

C/2023 A3 (Tsuchinshan-ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.19, 17.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 18.73, 18.1, -- (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 18.02, 17.4, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD); 16.08, 17.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 16.06, 18.1, -- (J. Ryske, Finland Viestikallio remote observatory, 0.305-m Newtonian + CCD); 15.02, 17.8, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 03.98, 18.0, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD); 02.18, 18.2, 0.4' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD); 01.20, 17.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD); feb 28.78, 18.2, -- (K. Yoshimoto, 0.51-m Newtonian + CCD); 28.20, 17.7, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD);

C/2023 B2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 06.94, 17.8, -- (G. Pappa, Namibia (remote control), 0.36-m Ritchey-Chretien + CCD);

C/2023 E1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 24.00, 17.8, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD); 18.65, 17.9, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD); 14.01, 18.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 10.08, 18.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 05.69, 18.4, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);

P/2021 N2 (Fuls)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 09.94, 18.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

P/2021 V2 (Fuls)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 22.93, 18.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 10.88, 18.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

P/2022 P2 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 12.00, 20.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);

P/2023 B1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 23.03, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 17.93, 18.2, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD); 16.01, 17.9, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 13.00, 17.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD); 02.95, 16.3, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.95, 16.4, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD); 01.12, 16.6, 1.1' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD); 01.03, 16.6, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD);

P/2023 B3 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 03.94, 19.0, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);

P/2023 C1 (Jahn)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
mar 25.90, 18.7, -- (G. Pappa, Namibia (remote control), 0.36-m Ritchey-Chretien + CCD);