12P/Pons-Brooks
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 24.27, 17.4, 0.2' (M. Olason, Arizona, 0.091-m Refractor + CCD);


13P/Olbers
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 25.19, 17.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    24.31, 17.3, 0.2' (M. Olason, Arizona, 0.091-m Refractor + CCD);


29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 09.89, 13.0, 1.7' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    08.90, 14.0, 1.7' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    06.92, 15.9, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    06.91, 13.5, 1.8' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    05.89, 14.4, 1.1' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    05.49, 13.0, 0.8' (O. Miyazaki, 0.32-m Newtonian);
may 31.44, 13.1, 1.7' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    30.91, 13.4, 1.1' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    30.89, 12.5, 4.5' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD);
    29.88, 13.2, 1.32' (K. Hills, 0.5-m Newtonian + CCD);
    28.91, 13.5, 1.5' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    28.45, 13.2, 1.7' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    27.91, 13.5, 1.4' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    27.73, 12.4, 5.1' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
    27.50, 13.0, 1.5' (Y. Yamaguchi, 0.13-m Hyperboloid astro-camera + CCD);
    27.49, 13.4, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    27.44, 13.1, 1.7' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    26.92, 12.5, 3.38' (K. Hills, 0.5-m Newtonian + CCD);
    26.92, 10.9, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    26.92, 13.2, 1.5' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.91, 13.4, 1.9' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    26.91, 12.9, 1.9' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    26.86, 13.2, 3.5' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    26.85, 12.9, 4.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    26.45, 13.5, 1' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    25.80, 12.5, 3.5' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    25.49, 13.4, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    24.86, 12.1, 5.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    24.86, 11.8, 6.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    24.86, 13.8, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    24.85, 12.9, 4.8' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    24.71, 13.7, 1' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    23.88, 13.4, 4' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.75, 12.3, 4.8' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    22.88, 11.8, 1.5' (U. Pilz, 0.32-m Newtonian);
    22.87, 11.8, 8.3' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD);
    21.45, 13.8, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    20.47, 12.7, 1.2' (O. Miyazaki, 0.32-m Newtonian);
    20.45, 13.4, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    19.97, 12.8, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    19.89, 11.6, 7' (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD);
    19.88, 12.8, 3.8' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD);
    18.88, 12.8, 2.82' (K. Hills, 0.5-m Newtonian + CCD);
    17.90, 12.6, 5.8' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    16.91, 11.3, 8' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    16.91, 10.7, 9.1' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    16.91, 11.1, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    16.88, 12.5, 3.76' (K. Hills, 0.5-m Newtonian + CCD);
    16.85, 13.7, 1.6' (T. Csorgei, 0.28-m Schmidt-Cassegrain + CCD);
    15.96, 13.2, 2.44' (K. Hills, 0.5-m Newtonian + CCD);
    15.92, 13.5, 1.7' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    15.87, 13.4, 1' (E. Bryssinck, 0.4-m Newtonian + CCD);


30P/Reinmuth
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 26.99, 19.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    18.10, 18.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


47P/Ashbrook-Jackson
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 30.79, 18.5, 0.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    26.03, 17.4, 0.4' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD; 0.9' tail in p.a. 247 deg);
    25.03, 17.7, 0.35' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD; 1.8' tail in p.a. 246 deg);
    24.45, 16.9, 0.3' (M. Olason, Arizona, 0.091-m Refractor + CCD);
    24.04, 17.5, 0.4' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD; 2.2' tail in p.a. 250 deg);


49P/Arend-Rigaux
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 23.73, 14.5, 2.2' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);


65P/Gunn
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 03.12, 15.2, 1.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
may 27.07, 16.8, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    25.15, 16.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    25.11, 15.4, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1.9' tail in p.a. 279 deg);


88P/Howell
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 26.95, 18.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    25.79, 18.1, 0.6' (T. Lehmann, Hakos (remote), 0.45-m Newtonian + CCD);


217P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 31.41, 12.6, 1.2' (M. Mattiazzo, iTelescope Deep Sky Chile, Rio Hurtado, 0.25-m Newtonian + CCD; 6.6' tail in p.a. 246 deg);


234P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 25.12, 19.0, 5' (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);


333P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 12.26, 19.4, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);


496P/Hill
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 24.85, 16.1, 1.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.89, 16.5, 1.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    20.85, 16.0, 1.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);


C/2014 UN271 (Bernardinelli-Bernstein)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 24.73, 14.7, 2.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);


C/2019 E3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 25.10, 16.6, 0.6' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    24.11, 16.9, 0.8' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);


C/2020 V2 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 06.38, 15.5, 1.2' (M. Mašek, Malargue, 0.3-m Cassegrain reflector + CCD);
    01.15, 15.8, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
may 31.93, 15.9, 0.8' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    26.02, 16.1, 0.6' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    25.11, 15.9, 0.9' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);


C/2021 G2 (Atlas)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 05.10, 15.3, 2' (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
    04.51, 13.6, 1.3' (Y. Yamaguchi, 0.13-m Hyperboloid astro-camera + CCD);
    03.99, 13.8, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.22° tail in p.a. 234 deg);
    03.05, 13.9, 1.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.13° tail in p.a. 233 deg);
    01.94, 13.9, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.19° tail in p.a. 234 deg);
may 31.98, 13.8, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.17° tail in p.a. 234 deg);
    31.51, 13.6, 1.4' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD; 1.8' tail in p.a. 237 deg);
    31.00, 13.5, 1.13' (K. Hills, 0.5-m Newtonian + CCD);
    30.97, 13.8, 1.5' (T. Lehmann, Italy (remote), 0.23-m Newtonian + CCD; 0.17° tail in p.a. 236 deg);
    30.96, 13.7, 2.3' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.24° tail in p.a. 236 deg);
    30.93, 13.4, 1.8' (M. Lošťák, 0.2-m Newtonian + CCD);
    30.93, 14.3, 2.9' (M. Lošťák, 0.2-m Newtonian + CCD);
    30.92, 14.4, 0.48' (S. Shurpakov, 0.41-m Newtonian + CCD);
    30.90, 13.4, 1.5' (M. Kalina, 0.08-m Refractor + CCD);
    30.29, 13.8, 1.6' (T. Lehmann, Chile (remote), 0.25-m Newtonian + CCD; 0.25° tail in p.a. 235 deg);
    29.94, 13.8, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.18° tail in p.a. 235 deg);
    28.92, 13.7, 1.3' (C. Harder, Jeersdorf f, 0.531-m Newtonian);
    28.51, 13.6, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD; 7.5' tail in p.a. 235 deg);
    27.88, 13.7, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.22° tail in p.a. 236 deg);
    27.54, 13.8, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 13' tail in p.a. 240 deg);
    27.54, 13.9, 1.1' (Y. Yamaguchi, 0.13-m Hyperboloid astro-camera + CCD);
    27.51, 13.6, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD; 7.7' tail in p.a. 228 deg);
    27.01, 13.6, 1.1' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.93, 11.8, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    26.91, 13.3, 2.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 7.6' tail in p.a. 233 deg);
    26.90, 13.3, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 6.6' tail in p.a. 237 deg);
    26.90, 14.2, 2.5' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 7.1' tail in p.a. 230 deg);
    26.90, 14.0, 1.8' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 3.4' tail in p.a. 231 deg);
    26.86, 13.7, 1.6' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.21° tail in p.a. 236 deg);
    26.65, 13.9, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD; 3.5' tail in p.a. 232 deg);
    25.64, 13.8, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD; 1.5' tail in p.a. 223 deg);
    24.90, 13.2, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 12.2' tail in p.a. 233 deg);
    24.90, 13.9, 2' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 4.6' tail in p.a. 231 deg);
    24.90, 13.3, 2.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 11.8' tail in p.a. 234 deg);
    24.89, 14.1, 2.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 11.1' tail in p.a. 232 deg);
    24.88, 13.7, 1.6' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.18° tail in p.a. 237 deg);
    24.24, 13.7, 1.7' (T. Lehmann, Chile (remote), 0.25-m Newtonian + CCD; 0.26° tail in p.a. 235 deg);
    23.98, 13.7, 1.6' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.23° tail in p.a. 235 deg);
    23.91, 13.4, 2' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 3.9' tail in p.a. 234 deg);
    23.91, 13.8, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 4.1' tail in p.a. 236 deg);
    23.90, 13.9, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 6.5' tail in p.a. 235 deg);
    23.90, 14.4, 1.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 2.5' tail in p.a. 233 deg);
    23.00, 13.7, 1.9' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.2° tail in p.a. 236 deg);
    22.89, 13.7, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.19° tail in p.a. 237 deg);
    22.16, 13.8, 1.6' (T. Lehmann, Chile (remote), 0.25-m Newtonian + CCD; 0.25° tail in p.a. 236 deg);
    22.01, 13.7, 1.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 2.8' tail in p.a. 230 deg);
    22.01, 13.4, 1.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 2.9' tail in p.a. 233 deg);
    21.68, 13.6, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    20.93, 14.2, 1.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 4.6' tail in p.a. 234 deg);
    20.93, 13.2, 2.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 8.7' tail in p.a. 234 deg);
    20.93, 13.4, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 8.2' tail in p.a. 235 deg);
    20.92, 13.9, 2.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 8.6' tail in p.a. 236 deg);
    20.66, 13.7, 1.3' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD);
    20.50, 13.4, 0.9' (O. Miyazaki, 0.32-m Newtonian);
    20.38, 13.0, 1.1' (M. Olason, Arizona, 0.05-m Refractor + CCD; 9' tail in p.a. 230 deg);
    20.32, 13.6, 1.9' (T. Lehmann, PieTown, NM (remote), 0.3-m Newtonian + CCD; 0.24° tail in p.a. 237 deg);
    20.03, 13.7, 1.6' (T. Lehmann, Chile (remote), 0.25-m Newtonian + CCD; 0.28° tail in p.a. 235 deg);
    19.99, 13.0, 1' (J. de Souza Aguiar, 0.3-m Newtonian);
    19.99, 13.5, 0.8' (W. Kutschera, 0.508-m Newtonian);
    19.97, 13.6, 2.2' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.23° tail in p.a. 237 deg);
    19.93, 13.5, 0.5' (W. Hasubick, 0.44-m Newtonian);
    19.82, 13.6, 1.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.21° tail in p.a. 238 deg);
    19.68, 13.3, 1.7' (A. Pearce, Nedlands, Perth, 0.05-m Refractor + CCD; 1.7' tail in p.a. 226 deg);
    18.12, 13.3, 1.13' (K. Hills, 0.5-m Newtonian + CCD);
    17.03, 13.7, 1.6' (T. Lehmann, Chile (remote), 0.25-m Newtonian + CCD; 0.29° tail in p.a. 235 deg);
    16.96, 13.8, 1.1' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 5.8' tail in p.a. 233 deg);
    16.96, 13.2, 1.3' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 6.3' tail in p.a. 236 deg);
    16.94, 11.7, 2.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    16.03, 13.8, 0.9' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    15.99, 13.2, 1' (W. Kutschera, 0.508-m Newtonian);


C/2021 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 16.20, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2022 E2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 07.12, 15.8, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
may 16.14, 15.6, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);


C/2023 A3 (Tsuchinshan-ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 09.99, 16.2, 0.5' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.6' tail in p.a. 197 deg);
    06.04, 15.9, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    03.24, 16.2, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
    01.01, 16.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
may 31.05, 13.3, 3.1' (T. Lehmann, Italy (remote), 0.23-m Newtonian + CCD);
    30.98, 16.9, 0.19' (S. Shurpakov, 0.41-m Newtonian + CCD);
    30.73, 15.4, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    27.59, 14.6, 0.3' (Y. Yamaguchi, 0.13-m Hyperboloid astro-camera + CCD);
    27.06, 15.1, 0.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    25.14, 15.2, 0.75' (K. Hills, 0.5-m Newtonian + CCD);
    24.96, 15.6, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    24.96, 14.3, 1.2' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.96, 14.8, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.95, 15.8, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.95, 15.2, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.95, 14.9, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    22.08, 15.0, 0.6' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    22.08, 15.5, 0.6' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    20.89, 14.3, 2.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    20.11, 11.9, 1.1' (W. Kutschera, 0.508-m Newtonian);
    20.05, 14.2, 1.6' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.05° tail in p.a. 201 deg);
    16.98, 11.0, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    16.07, 14.6, 1' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);


C/2023 C2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 06.10, 15.4, 0.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
may 31.06, 14.8, 1.6' (T. Lehmann, Italy (remote), 0.23-m Newtonian + CCD);
    27.10, 16.1, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    16.12, 15.9, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);


C/2023 H5 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 09.90, 16.9, 0.5' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.5' tail in p.a. 168 deg);
may 30.95, 17.3, 0.24' (S. Shurpakov, 0.41-m Newtonian + CCD);
    30.94, 16.9, 0.4' (T. Lehmann, Italy (remote), 0.23-m Newtonian + CCD; 1.4' tail in p.a. 168 deg);
    30.92, 16.6, 0.7' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 2.3' tail in p.a. 172 deg);
    30.88, 17.3, 0.6' (M. Lošťák, 0.2-m Newtonian + CCD);
    30.88, 16.1, 0.6' (M. Lošťák, 0.2-m Newtonian + CCD);
    26.97, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    26.96, 16.9, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.89, 17.0, 0.5' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.7' tail in p.a. 169 deg);
    26.89, 16.0, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.3' tail in p.a. 167 deg);
    26.89, 15.9, 1.2' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.4' tail in p.a. 168 deg);
    26.88, 17.1, 0.8' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 2' tail in p.a. 171 deg);
    24.89, 15.9, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.6' tail in p.a. 170 deg);
    24.88, 16.8, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.7' tail in p.a. 169 deg);
    23.93, 16.2, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1' tail in p.a. 168 deg);
    23.92, 16.7, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.8' tail in p.a. 170 deg);
    23.92, 16.9, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.6' tail in p.a. 164 deg);
    23.91, 17.0, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.9' tail in p.a. 166 deg);
    22.96, 16.6, 0.8' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 2.2' tail in p.a. 172 deg);
    22.92, 16.6, 0.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 0.4' tail in p.a. 162 deg);
    22.92, 16.2, 0.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 0.4' tail in p.a. 169 deg);
    21.96, 16.9, 0.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 0.4' tail in p.a. 175 deg);
    20.91, 15.9, 1.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.7' tail in p.a. 170 deg);
    20.91, 16.2, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.9' tail in p.a. 171 deg);
    20.90, 17.1, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1' tail in p.a. 169 deg);
    20.90, 17.1, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 2.6' tail in p.a. 171 deg);
    19.93, 16.5, 0.9' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 2' tail in p.a. 173 deg);
    16.87, 15.1, 0.5' (T. Csorgei, 0.28-m Schmidt-Cassegrain + CCD);


C/2023 Q1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 15.98, 18.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2023 R1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 10.03, 16.6, 0.8' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.6' tail in p.a. 87 deg);
    06.08, 16.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
may 31.40, 16.4, 1.1' (T. Lehmann, Utah (remote), 0.28-m Newtonian + CCD);
    30.77, 16.4, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    29.11, 15.8, 0.41' (M. Mašek, La Palma (MPC 950), 0.25-m Schmidt-Cassegrain + CCD);
    29.11, 15.6, 0.41' (M. Mašek, La Palma (MPC 950), 0.25-m Schmidt-Cassegrain + CCD);
    24.43, 16.1, 0.4' (M. Olason, Arizona, 0.091-m Refractor + CCD; 1' tail in p.a. 90 deg);
    23.05, 16.4, 0.9' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD);
    16.10, 16.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);


C/2023 T3 (Fuls)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 30.92, 16.5, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    26.93, 16.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2023 V1 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 05.15, 18.3, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);


C/2024 B1 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 24.94, 17.8, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    18.95, 17.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2024 E1 (Wierzchos)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 09.95, 16.0, 0.7' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.4' tail in p.a. 216 deg);
    06.02, 16.4, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
may 31.93, 16.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    31.01, 16.1, 1.1' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.7' tail in p.a. 232 deg);
    30.99, 16.3, 0.5' (T. Lehmann, Italy (remote), 0.23-m Newtonian + CCD; 0.4' tail in p.a. 227 deg);
    30.97, 15.9, 0.6' (M. Lošťák, 0.2-m Newtonian + CCD);
    30.97, 16.9, 0.7' (M. Lošťák, 0.2-m Newtonian + CCD);
    30.33, 16.0, 1.1' (T. Lehmann, Utah (remote), 0.28-m Newtonian + CCD; 0.5' tail in p.a. 236 deg);
    27.03, 16.6, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.87, 16.2, 0.8' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.3' tail in p.a. 229 deg);
    26.87, 17.0, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.3' tail in p.a. 237 deg);
    25.53, 16.2, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 0.3' tail in p.a. 240 deg);
    24.94, 16.1, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.4' tail in p.a. 233 deg);
    24.94, 17.0, 0.8' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.4' tail in p.a. 240 deg);
    24.93, 15.1, 0.4' (R. Haver, Frasso Sabino, Rieti, Italy, 3.68-m Cassegrain reflector + CCD; 0.3' tail in p.a. 231 deg);
    23.94, 16.3, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.93, 16.8, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    23.93, 15.8, 1.2' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    22.04, 16.5, 0.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    22.04, 16.2, 0.4' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD; 0.2' tail in p.a. 261 deg);
    20.88, 16.2, 1.3' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.3' tail in p.a. 241 deg);
    20.88, 16.8, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.3' tail in p.a. 244 deg);
    20.01, 16.0, 0.9' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.5' tail in p.a. 240 deg);
    17.08, 16.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    16.05, 16.6, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);


C/2024 G3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 20.35, 13.1, 1' (J. de Souza Aguiar, 0.3-m Newtonian);


C/2024 G4 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 05.14, 18.3, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);


C/2024 J3 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 06.06, 16.3, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    02.04, 15.9, 0.8' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1' tail in p.a. 205 deg);
    01.20, 16.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
may 25.99, 16.0, 0.5' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD; 0.5' tail in p.a. 209 deg);
    25.16, 16.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    24.89, 16.1, 0.5' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD);
    23.04, 16.0, 0.8' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1' tail in p.a. 204 deg);


C/2024 J4 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 03.12, 18.4, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);


C/2024 L5 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 26.94, 16.8, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.94, 16.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    25.81, 16.3, 0.5' (A. Pearce, Skygems Namibia Remote Observatory, 0.45-m Schmidt-Cassegrain + CCD; 3.4' tail in p.a. 116 deg);
    24.88, 16.0, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 1.9' tail in p.a. 121 deg);
    24.87, 16.6, 0.8' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 2.1' tail in p.a. 119 deg);
    22.91, 16.2, 0.9' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD; 0.06° tail in p.a. 116 deg);
    20.86, 16.4, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.8' tail in p.a. 116 deg);
    20.86, 16.8, 1' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD; 0.9' tail in p.a. 109 deg);
    15.97, 16.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2024 N3 (Sarneczky)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 03.57, 18.2, 0.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);


C/2025 E1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 05.13, 16.3, 8' (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD; 20' tail in p.a. 200 deg);


C/2025 J1 (Borisov)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 12.15, 19.2, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
    03.31, 19.0, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
may 31.89, 19.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    26.99, 19.6, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    26.02, 19.4, 0.2' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    25.97, 19.7, 0.2' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    25.08, 19.3, 7' (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
    23.98, 19.8, 0.1' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);
    20.97, 19.6, 0.2' (D. Heggie, ASERO, Trevinca, Spain, 0.303-m Newtonian + CCD);


C/2025 K1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 08.11, 17.8, 0.19' (J. Ryske, Y71 Makroskooppi, Fregenal de la Sierra, Spain, 0.3-m Ritchey-Chretien + CCD; 0.13' tail in p.a. 250 deg);
    06.12, 17.4, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    04.74, 17.4, 0.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 0.3' tail in p.a. 250 deg);
    03.28, 17.6, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
    02.15, 17.8, 0.4' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD);
may 31.04, 17.9, 0.5' (S. Fritsche, Koeditz, 0.279-m Newtonian + CCD);
    29.16, 18.0, 0.3' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    29.16, 17.6, 0.3' (M. Mašek, CTA-N La Palma, 0.25-m Schmidt-Cassegrain + CCD);
    27.41, 17.8, 0.25' (K. Yoshimoto, 0.51-m Newtonian + CCD);
    27.27, 17.9, 10' (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD; 11" tail in p.a. 260 deg);
    27.12, 18.0, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    25.45, 17.7, 0.2' (M. Mattiazzo, iTelescope SRO Observatory, Auberry, 0.6-m Newtonian + CCD);


C/2025 K4 (Siverd)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 05.29, 19.0, 0.2' (M. Mašek, Malargue, 0.3-m Cassegrain reflector + CCD);


C/2025 L2
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 05.38, 19.5, 0.2' (M. Mašek, Malargue, 0.3-m Cassegrain reflector + CCD);


P/2023 S1
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
may 29.90, 17.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    24.87, 17.6, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    20.85, 17.4, 0.7' (J. Koukal, Valasske Mezirici, 0.5-m Newtonian + CCD);
    20.21, 16.1, 1.7' (T. Lehmann, PieTown, NM (remote), 0.3-m Newtonian + CCD);
    16.89, 17.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    16.84, 17.0, 0.7' (T. Csorgei, 0.28-m Schmidt-Cassegrain + CCD);


P/2025 C1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2025
jun 12.09, 19.7, -- (J. Maikner, Comet Hunter Observatory2, New Ringgold, 0.305-m Hyperboloid astro-camera + CCD);
may 17.04, 18.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);