12P/Pons-Brooks
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 28.95, 17.3, 0.4' (M. Lošťák, 0.2-m Newtonian + CCD);
    27.97, 16.9, 0.9' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.6' tail in p.a. 270 deg);
    26.01, 17.4, 0.5' (M. Lošťák, 0.2-m Newtonian + CCD);
    25.23, 17.8, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    25.01, 17.0, 0.8' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.3' tail in p.a. 139 deg);
    15.64, 17.4, 0.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    12.23, 17.6, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    11.22, 17.4, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


71P/Clark
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 31.15, 13.8, 3.6' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.22° tail in p.a. 240 deg);
    25.15, 13.7, 3.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.24° tail in p.a. 241 deg);
    23.84, 13.2, 0.5' (P. Camilleri, 0.406-m Newtonian);
    22.15, 13.7, 3.1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.25° tail in p.a. 243 deg);
    21.83, 13.5, 0.8' (P. Camilleri, 0.406-m Newtonian);
    20.31, 13.7, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    18.31, 13.5, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    16.83, 13.0, 0.4' (P. Camilleri, 0.406-m Newtonian);


72P/Denning-Fujikawa
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 18.17, 18.5, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);


77P/Longmore
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 23.47, 14.2, 0.4' (P. Camilleri, 0.406-m Newtonian);
    23.44, 14.3, 1.4' (C. Wyatt, 0.4-m Newtonian);
    21.46, 14.2, 0.4' (P. Camilleri, 0.406-m Newtonian);
    19.84, 13.8, 2.3' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 2.4' tail in p.a. 20 deg);
    16.48, 14.1, 0.5' (P. Camilleri, 0.406-m Newtonian);
    14.74, 14.0, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);
    14.07, 14.0, -- (J. de Souza Aguiar, 0.3-m Newtonian);
    13.54, 14.0, 1' (P. Camilleri, 0.406-m Newtonian);
    13.08, 13.9, -- (J. de Souza Aguiar, 0.3-m Newtonian);
    12.50, 14.0, 1' (P. Camilleri, 0.406-m Newtonian);


80P/Peters-Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 26.34, 18.9, -- (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
may 30.05, 13.1, 2.1' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.16° tail in p.a. 273 deg);
    26.05, 14.0, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    24.70, 12.0, 0.9' (O. Miyazaki, 0.32-m Newtonian);
    23.76, 13.0, 0.5' (P. Camilleri, 0.406-m Newtonian);
    21.96, 13.2, 1.4' (M. Paradowski, 0.068-m Refractor + CCD);
    21.76, 13.2, 0.5' (P. Camilleri, 0.406-m Newtonian);
    17.72, 12.6, 0.9' (O. Miyazaki, 0.32-m Newtonian);
    16.73, 13.0, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    11.02, 14.3, 0.3' (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);


96P/Machholz
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 12.30, 17.4, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    11.94, 17.4, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);


99P/Kowal
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 13.14, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


103P/Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 01.14, 15.8, 2.6' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
may 30.14, 17.2, 1.1' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
    21.16, 17.1, 1.6' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
    18.34, 19.2, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


117P/Helin-Roman-Alu
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 25.15, 15.9, 1.3' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.12° tail in p.a. 239 deg);
    22.15, 15.9, 1.3' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.18° tail in p.a. 242 deg);


126P/IRAS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 19.17, 15.0, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);


185P/Petriew
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.17, 14.8, 2.7' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
    25.17, 15.0, 2.2' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);


199P/Shoemaker
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 26.07, 16.9, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    15.05, 16.7, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);


219P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 26.88, 16.8, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);
    26.25, 17.6, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    25.26, 18.6, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


237P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 31.72, 12.5, 0.9' (O. Miyazaki, 0.32-m Newtonian);
    29.11, 12.0, 3.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    28.04, 12.1, 3.8' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.17° tail in p.a. 257 deg);
    28.04, 13.0, 1' (W. Hasubick, 0.44-m Newtonian);
    26.09, 13.4, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    26.01, 12.6, 1' (C. Harder, Farm Heimat, NAM, 0.196-m Newtonian);
    25.05, 12.4, 3' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.13° tail in p.a. 254 deg);
    23.82, 12.6, 1' (P. Camilleri, 0.406-m Newtonian);
    23.74, 11.9, 2.2' (O. Miyazaki, 0.32-m Newtonian);
    22.02, 12.1, 2.1' (M. Paradowski, 0.068-m Refractor + CCD);
    21.74, 12.7, 1.1' (P. Camilleri, 0.406-m Newtonian);
    20.28, 13.3, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.12, 12.6, 2.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.15° tail in p.a. 256 deg);
    20.07, 12.4, 1.3' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    18.28, 13.3, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    17.73, 13.4, 0.8' (O. Miyazaki, 0.32-m Newtonian);
    16.98, 12.9, 0.9' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    16.77, 12.7, 1' (P. Camilleri, 0.406-m Newtonian);
    16.71, 12.1, 0.9' (O. Miyazaki, 0.32-m Newtonian);
    16.68, 13.0, 1.1' (K. Harikae, 0.15-m Newtonian + CCD; 0.9' tail in p.a. 262 deg);
    16.06, 12.4, 2.5' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.07° tail in p.a. 257 deg);
    14.00, 11.9, 0.75' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    13.28, 13.4, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    12.28, 14.3, 1' (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    11.94, 13.8, 1' (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);


263P/Gibbs
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 18.08, 18.8, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    11.07, 19.1, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


287P/Christensen
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 11.08, 18.0, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);


364P/PANSTARRS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 31.17, 12.7, 3.3' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 1.27° tail in p.a. 235 deg);
    23.83, 13.0, 0.5' (P. Camilleri, 0.406-m Newtonian);
    21.84, 12.7, 0.5' (P. Camilleri, 0.406-m Newtonian; 1.5' tail in p.a. 210 deg);
    20.31, 12.9, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.15, 12.1, 3' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1.06° tail in p.a. 236 deg);
    19.31, 12.7, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    18.30, 12.7, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    16.84, 12.3, 0.4' (P. Camilleri, 0.406-m Newtonian; 1.5' tail in p.a. 215 deg);
    13.31, 12.6, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    12.31, 12.6, 2' (J. de Souza Aguiar, 0.3-m Newtonian);


C/2014 UN271 (Bernardinelli-Bernstein)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 01.17, 16.1, 1.8' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
may 22.16, 16.3, 1.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);


C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.73, 10.7, 5.7' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.51° tail in p.a. 182 deg);
    19.74, 10.6, 2.2' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    19.73, 10.4, 7.8' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.69° tail in p.a. 186 deg);
    18.74, 11.0, 1.9' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    17.75, 11.0, 2' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    13.74, 10.0, 3.3' (C. Harder, Capricorn Restcamp, NAM, 0.196-m Newtonian);


C/2019 L3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 23.44, 12.9, 0.8' (P. Camilleri, 0.406-m Newtonian);
    23.42, 12.7, 1' (C. Wyatt, 0.4-m Newtonian);
    21.42, 13.0, 0.5' (P. Camilleri, 0.406-m Newtonian);
    20.99, 13.6, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.81, 12.9, 1.1' (C. Harder, Soft Adventure Camp, NAM, 0.196-m Newtonian);
    19.86, 12.9, 1.1' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    19.81, 11.9, 5.1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.18° tail in p.a. 338 deg);
    18.77, 12.4, 1.5' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    17.98, 13.5, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    16.97, 13.5, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    16.44, 12.9, 0.8' (P. Camilleri, 0.406-m Newtonian);
    15.98, 13.4, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    14.98, 13.4, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    14.80, 12.4, 1.5' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    13.98, 13.3, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    13.52, 13.4, 1.2' (P. Camilleri, 0.406-m Newtonian);
    12.99, 13.3, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    12.46, 13.6, 0.5' (P. Camilleri, 0.406-m Newtonian);
    11.98, 13.2, 1' (J. de Souza Aguiar, 0.3-m Newtonian);


C/2019 T4 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 07.52, 12.8, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    05.99, 12.4, 1.3' (W. Kutschera, 0.54-m Newtonian);
    05.95, 14.6, 0.48' (S. Shurpakov, 0.41-m Newtonian + CCD);
    02.88, 14.0, 2.2' (M. Lošťák, 0.2-m Newtonian + CCD);
may 30.93, 13.3, 2.4' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.16° tail in p.a. 234 deg);
    30.38, 14.3, 1.4' (D. Heggie, UDRO, Utah, 0.15-m Refractor + CCD; 5' tail in p.a. 233 deg);
    28.03, 11.8, 0.6' (W. Hasubick, 0.44-m Newtonian);
    25.99, 12.8, 1.5' (C. Harder, Capricorn Restcamp, NAM, 0.196-m Newtonian);
    25.97, 13.1, 1.5' (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD; 13' tail in p.a. 237 deg);
    25.95, 13.4, 4' (M. Lošťák, 0.2-m Newtonian + CCD);
    24.97, 13.2, 2.5' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.17° tail in p.a. 236 deg);
    24.51, 12.4, 1.6' (O. Miyazaki, 0.32-m Newtonian);
    23.75, 12.8, 1.5' (P. Camilleri, 0.406-m Newtonian);
    23.73, 12.8, 1.3' (O. Miyazaki, 0.32-m Newtonian);
    23.45, 13.3, 2' (C. Wyatt, 0.4-m Newtonian);
    22.00, 13.1, 1.5' (G. van Buitenen, Dordrecht, NL, 0.203-m Ritchey-Chretien + CCD; 4' tail in p.a. 235 deg);
    21.91, 12.9, 2.1' (M. Paradowski, 0.068-m Refractor + CCD);
    21.87, 13.5, 0.5' (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD; 8' tail);
    21.73, 13.3, 0.8' (P. Camilleri, 0.406-m Newtonian);
    20.95, 13.2, 2.2' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.19° tail in p.a. 234 deg);
    20.86, 13.4, 0.5' (C. Harder, Soft Adventure Camp, NAM, 0.196-m Newtonian);
    20.25, 13.7, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.08, 13.0, 0.9' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    18.95, 12.9, 1.8' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    18.25, 13.7, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    17.96, 12.9, 3.7' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.09° tail in p.a. 232 deg);
    17.50, 13.0, 1.5' (O. Miyazaki, 0.32-m Newtonian);
    16.76, 13.6, 0.5' (P. Camilleri, 0.406-m Newtonian);
    16.68, 13.4, 1.7' (K. Harikae, 0.15-m Newtonian + CCD);
    15.96, 12.8, 5.1' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.23° tail in p.a. 238 deg);
    15.56, 13.3, 1.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 11' tail in p.a. 235 deg);
    13.99, 13.1, 1.1' (W. Kutschera, 0.54-m Newtonian);
    13.88, 14.3, 0.58' (S. Shurpakov, 0.41-m Newtonian + CCD; 8.3' tail in p.a. 239 deg);
    11.32, 13.5, 1.3' (D. Heggie, UDRO, Utah, 0.15-m Refractor + CCD; 13' tail in p.a. 237 deg);
    11.01, 12.8, 2.1' (M. Paradowski, 0.068-m Refractor + CCD);


C/2019 U5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 09.21, 14.2, 0.5' (D. Heggie, UDRO, Utah, 0.15-m Refractor + CCD; 3' tail in p.a. 50 deg);
may 27.86, 12.2, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD);
    25.86, 12.8, -- (T. Csorgei, Blahová, 0.28-m Schmidt-Cassegrain + CCD);
    24.48, 12.1, 1.1' (O. Miyazaki, 0.32-m Newtonian);
    23.45, 12.7, 0.6' (P. Camilleri, 0.406-m Newtonian);
    23.43, 13.7, 0.7' (C. Wyatt, 0.4-m Newtonian; 3' tail in p.a. 68 deg);
    21.43, 12.8, 1' (P. Camilleri, 0.406-m Newtonian);
    20.99, 13.2, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.89, 12.5, 0.8' (G. Sánta, Aka, 0.25-m Newtonian);
    19.82, 13.3, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.14° tail in p.a. 55 deg);
    19.77, 13.1, 1.3' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    18.78, 13.0, 1.5' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    17.99, 13.2, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    17.47, 13.3, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    16.98, 13.1, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    16.48, 12.5, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    16.46, 12.7, 1' (P. Camilleri, 0.406-m Newtonian);
    15.99, 13.1, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    15.88, 11.8, 1.5' (C. Labordena, Atzaneta, 0.2-m Schmidt-Cassegrain);
    15.86, 12.8, 3.1' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    14.99, 13.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    13.99, 13.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    13.53, 12.9, 1.5' (P. Camilleri, 0.406-m Newtonian);
    12.99, 12.9, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    12.92, 11.5, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    12.86, 12.0, 1.5' (C. Harder, Capricorn Restcamp, NAM, 0.196-m Newtonian);
    12.48, 12.8, 1.2' (P. Camilleri, 0.406-m Newtonian);
    12.46, 12.2, 1' (M. Mattiazzo, Halls creek, WA, 0.28-m Schmidt-Cassegrain);
    11.99, 12.9, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    11.58, 11.7, 1.1' (O. Miyazaki, 0.32-m Newtonian);


C/2020 K1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.16, 12.2, 4.8' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.25° tail in p.a. 315 deg);
    27.12, 12.3, 1' (C. Harder, Farm Heimat, NAM, 0.196-m Newtonian);
    26.02, 13.0, 1.3' (C. Harder, Hardap Resort, NAM, 0.196-m Newtonian);
    24.12, 12.8, 1.7' (C. Harder, Hardap Resort, NAM, 0.196-m Newtonian);
    23.77, 12.7, 1' (P. Camilleri, 0.406-m Newtonian);
    23.46, 12.5, 1.7' (C. Wyatt, 0.4-m Newtonian);
    21.75, 12.7, 1' (P. Camilleri, 0.406-m Newtonian);
    20.28, 12.1, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.13, 12.5, 2.7' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.2° tail in p.a. 314 deg);
    20.05, 12.5, 1.5' (C. Harder, Cap, 0.508-m Newtonian);
    19.30, 12.2, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    19.15, 10.6, 1.6' (J. Chambó Bris, Farm Hakos, Namibia, 0.508-m Ritchey-Chretien + CCD; 8.5' tail in p.a. 320 deg);
    18.94, 12.4, 1.6' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    18.29, 12.2, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    18.07, 11.6, 2' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    16.78, 12.8, 0.7' (P. Camilleri, 0.406-m Newtonian);
    13.29, 12.4, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    12.28, 12.4, 2' (J. de Souza Aguiar, 0.3-m Newtonian);


C/2020 R7 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.97, 15.5, 1.4' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.09° tail in p.a. 160 deg);
    29.09, 16.0, 0.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.01, 16.4, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    25.97, 15.7, 1.8' (M. Lošťák, 0.2-m Newtonian + CCD);
    25.93, 15.6, 1.3' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.06° tail in p.a. 167 deg);
    20.02, 15.5, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.08° tail in p.a. 166 deg);
    16.03, 14.9, 2.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.06° tail in p.a. 164 deg);
    13.96, 16.0, 0.29' (S. Shurpakov, 0.41-m Newtonian + CCD; 0.6' tail in p.a. 151 deg);
    12.14, 15.2, 0.7' (W. Kutschera, 0.54-m Newtonian + CCD);


C/2020 S4 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.90, 16.0, 1.1' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 2.3' tail in p.a. 267 deg);
    20.74, 16.0, 1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.06° tail in p.a. 262 deg);
    15.92, 16.4, 0.9' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);


C/2021 G2 (Atlas)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 20.76, 15.4, 1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1' tail in p.a. 285 deg);


C/2021 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.76, 14.4, 1.2' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 1.3' tail in p.a. 262 deg);
    19.76, 14.5, 1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.9' tail in p.a. 286 deg);
    13.74, 13.6, 0.6' (J. Chambó Bris, Farm Hakos, Namibia, 0.508-m Ritchey-Chretien + CCD; 1' tail in p.a. 287 deg);


C/2021 T4 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 01.15, 10.6, 12' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
may 31.17, 10.4, 4' (J. Chambó Bris, Farm Hakos, Namibia, 0.508-m Ritchey-Chretien + CCD);
    24.81, 11.2, 4' (M. Mattiazzo, Victoria River, Northern Territory, 0.07-m Camera lens + CCD);
    23.84, 12.4, 1.5' (P. Camilleri, 0.406-m Newtonian);
    23.80, 11.0, 8.5' (C. Hergenrother, remote iTelescopes T08, 0.106-m Refractor + CCD);
    21.85, 12.6, 2' (P. Camilleri, 0.406-m Newtonian);
    20.33, 13.2, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    20.16, 11.1, 9.1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
    20.13, 11.1, 1.8' (C. Harder, Capricorn Restcamp, NAM, 0.508-m Newtonian);
    19.17, 10.5, -- (G. Pappa, Namibia (remote control), 0.106-m Refractor + CCD);
    18.32, 13.4, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    16.85, 13.0, 1' (P. Camilleri, 0.406-m Newtonian);


C/2021 Y1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.75, 13.6, 3' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.07° tail in p.a. 333 deg);
    19.74, 13.4, 3.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.07° tail in p.a. 339 deg);


C/2022 A2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 31.73, 12.1, 1.3' (O. Miyazaki, 0.32-m Newtonian);
    31.06, 11.8, 0.9' (W. Hasubick, 0.44-m Newtonian);
    31.03, 11.0, 6.7' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 0.1° tail in p.a. 339 deg);
    31.00, 11.4, 2.7' (M. Paradowski, Dabrowa, Poland, 0.034-m Camera lens + CCD);
    30.44, 11.3, 3' (J. Chambó Bris, Utah Desert Observatory, USA, 0.51-m Ritchey-Chretien + CCD);
    29.13, 11.6, 2.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    25.76, 11.4, 2.5' (K. Harikae, 0.15-m Newtonian + CCD);
    24.71, 11.3, 1.6' (O. Miyazaki, 0.32-m Newtonian);
    24.44, 10.7, 9' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.14° tail in p.a. 328 deg);
    23.75, 11.6, 1.7' (O. Miyazaki, 0.32-m Newtonian);
    18.08, 11.6, 1.8' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    17.74, 11.8, 1.7' (O. Miyazaki, 0.32-m Newtonian);
    16.75, 11.5, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    16.09, 11.2, 2.9' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    15.12, 10.8, 2' (C. Labordena, La Serra d Engarcera, 0.2-m Schmidt-Cassegrain);


C/2022 E2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 19.79, 15.8, 0.7' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.9' tail in p.a. 129 deg);


C/2022 E3 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 30.74, 12.5, 3' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.13° tail in p.a. 62 deg);
    21.74, 12.2, 3.9' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.28° tail in p.a. 49 deg);


C/2022 JK5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 24.06, 16.7, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);


C/2022 L2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 04.97, 15.4, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.9' tail in p.a. 70 deg);
    02.96, 15.8, 1.1' (M. Lošťák, 0.2-m Newtonian + CCD);
may 31.00, 15.4, 1' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 1' tail in p.a. 70 deg);
    28.92, 16.1, 0.9' (M. Lošťák, 0.2-m Newtonian + CCD);
    25.02, 15.5, 0.2' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD);
    24.97, 15.5, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.7' tail in p.a. 76 deg);
    22.03, 15.8, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    20.04, 15.7, 0.8' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1' tail in p.a. 71 deg);
    14.02, 15.5, 1.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.8' tail in p.a. 65 deg);
    13.99, 15.4, 0.48' (S. Shurpakov, 0.41-m Newtonian + CCD; 0.8' tail in p.a. 72 deg);


C/2022 P1 (NEOWISE)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 19.92, 14.7, 2.7' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.06° tail in p.a. 111 deg);


C/2022 U2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 19.77, 16.8, 1.1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);


C/2022 U4 (Bok)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 13.93, 18.9, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD);


C/2022 W3 (Leonard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 05.00, 15.7, 0.7' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
may 28.02, 14.7, 1.8' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD; 1.3' tail in p.a. 11 deg);


C/2023 A3 (Tsuchinshan-ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 08.90, 16.9, 0.8' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    05.91, 16.7, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD);
    04.89, 17.2, 0.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
may 28.32, 17.1, -- (D. Heggie, UDRO, Utah, 0.15-m Refractor + CCD);
    27.90, 16.9, 0.4' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD);
    25.91, 17.2, 0.6' (M. Lošťák, 0.2-m Newtonian + CCD);
    24.94, 16.9, 0.5' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD);
    24.93, 16.3, 0.2' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD);
    24.88, 17.4, 0.6' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    22.97, 16.5, 0.33' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD);
    21.96, 16.4, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    21.63, 16.5, 0.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    21.00, 17.0, 0.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
    18.10, 16.7, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    18.01, 17.0, 0.4' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.2' tail in p.a. 135 deg);
    16.97, 16.9, 0.4' (C. Hergenrother, Skygems Obs, Hakos, Namibia, 0.5-m Ritchey-Chretien + CCD; 6" tail in p.a. 120 deg);
    15.99, 16.9, 0.8' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.4' tail in p.a. 119 deg);
    14.97, 16.7, 0.4' (M. Phillips, Forthimage Observatory, Edinburgh UK, 0.25-m Newtonian + CCD);
    14.05, 16.4, 0.8' (P. Dekelver, 0.3-m Newtonian + CCD);
    13.99, 17.0, 0.7' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    13.85, 16.9, 0.24' (S. Shurpakov, 0.41-m Newtonian + CCD);


C/2023 B2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 25.91, 16.2, 0.5' (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    17.87, 15.1, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);


C/2023 C2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 13.83, 17.5, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);


C/2023 E1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
jun 08.94, 10.9, 5.5' (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    07.50, 11.8, 1.5' (O. Miyazaki, 0.32-m Newtonian);
    04.93, 10.5, 12' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    03.96, 10.5, 13' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD);
    02.92, 11.7, 4.2' (M. Lošťák, 0.2-m Newtonian + CCD);
may 31.70, 11.5, 2' (O. Miyazaki, 0.32-m Newtonian);
    30.96, 11.0, 5' (M. Paradowski, Dabrowa, Poland, 0.034-m Camera lens + CCD);
    30.91, 10.6, 1.4' (W. Hasubick, 0.44-m Newtonian);
    28.88, 11.8, 5.5' (M. Lošťák, 0.2-m Newtonian + CCD);
    27.93, 12.5, 3.01' (N. James, 0.28-m Schmidt-Cassegrain + CCD);
    25.89, 10.8, 12' (T. Lehmann, Weimar, 0.279-m Newtonian + CCD);
    25.87, 11.8, 6.6' (M. Lošťák, 0.2-m Newtonian + CCD);
    24.96, 11.3, 5.5' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD);
    24.93, 10.8, 12' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    24.49, 12.9, 1.6' (O. Miyazaki, 0.32-m Newtonian);
    22.93, 14.0, 1.67' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD);
    22.35, 11.0, 12' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD);
    21.99, 11.5, 3' (G. Pappa, Piemonte,Italy (remote control), 0.2-m Newtonian + CCD);
    21.92, 11.0, 8' (P. Guzik, 25x100 Binoculars);
    21.91, 12.2, 4.5' (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    21.53, 11.1, 7.9' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    20.21, 13.7, 4' (D. Heggie, UDRO, Utah, 0.15-m Refractor + CCD);
    17.48, 12.8, 1.5' (O. Miyazaki, 0.32-m Newtonian);
    16.89, 11.1, 12' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    16.50, 13.1, 2' (O. Miyazaki, 0.32-m Newtonian);
    15.90, 11.3, 5' (C. Labordena, Atzaneta, 0.2-m Schmidt-Cassegrain);
    15.49, 13.4, 2.7' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    14.01, 14.1, 2' (P. Dekelver, 0.3-m Newtonian + CCD);
    13.95, 11.4, 13' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    13.94, 14.0, 1.2' (S. Shurpakov, 0.41-m Newtonian + CCD);
    12.94, 10.8, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    12.90, 15.5, 0.48' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD);
    11.59, 12.6, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    10.92, 11.5, 6' (P. Guzik, 25x100 Binoculars);
    10.91, 12.7, 4' (M. Paradowski, 0.034-m Camera lens + CCD);


C/2023 H1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 17.77, 19.5, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);


P/2014 OL465 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 21.83, 18.4, -- (G. Pappa, Namibia (remote control), 0.5-m Prime focus of a reflector + CCD);


P/2018 HT3 (NEOWISE)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
may 14.76, 16.9, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);