12P/Pons-Brooks
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 08.37, 8.8, 3' (O. Miyazaki, 0.32-m Newtonian);
    08.08, 9.0, 3' (C. Hergenrother, Tanque Verde, Arizona, 30x125.0 Binoculars);
    07.86, 10.8, 3.2' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    07.79, 8.8, 2' (U. Pilz, 0.105-m Refractor);
    07.43, 8.6, 7.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 15' tail in p.a. 25 deg);
    07.43, 8.2, 5.5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    07.43, 9.0, 7.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    07.37, 8.9, 4.3' (O. Miyazaki, 0.32-m Newtonian);
    06.81, 9.1, 3' (A. Scholten, Eerbeek, 0.2-m Newtonian);
    06.76, 9.1, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    06.39, 10.2, 2.4' (O. Miyazaki, 0.32-m Newtonian);
    05.82, 9.1, 6.5' (M. Phillips, ASERO Trevinca Skies, Spain, 0.094-m Refractor + CCD);
    05.82, 8.8, 8.8' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 9' tail in p.a. 30 deg);
    05.71, 9.3, 3' (P. Guzik, 25x100 Binoculars);
    04.76, 8.8, 5' (C. Labordena, La Serra d Engarcera, 0.2-m Schmidt-Cassegrain);
    04.73, 9.0, 6.6' (D. Buczynski, Tarbatness MPC I81, 0.35-m Schmidt-Cassegrain + CCD);
    04.70, 8.7, 3.5' (B. Granslo, Hakadal, 0.08-m Refractor);
    04.38, 9.2, 4.5' (O. Miyazaki, 0.32-m Newtonian);
    03.79, 10.2, 1.9' (J. Solaz, Caldes de Montbui, 0.254-m Newtonian + CCD);
    03.72, 8.7, 4' (A. Kammerer, Karlsruhe, Germany, 0.203-m Schmidt-Cassegrain);
    03.42, 8.3, 2.7' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    03.41, 9.4, 6.1' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    03.41, 8.7, 6.1' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 8' tail in p.a. 33 deg);
    03.38, 8.9, 5.3' (O. Miyazaki, 0.32-m Newtonian);
    02.81, 8.5, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    02.80, 8.8, 4' (V. Díaz, La Romana, Alicante, Spain, 0.2-m Newtonian);
    02.79, 8.9, 7.3' (M. Phillips, ASERO Trevinca Skies, Spain, 0.094-m Refractor + CCD; 10' tail in p.a. 34 deg);
    02.77, 8.8, 7.6' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 12' tail in p.a. 30 deg);
    02.76, 8.7, 3' (B. Granslo, Hakadal, 0.08-m Refractor);
    02.75, 10.3, 4.2' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    02.41, 8.7, 3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    02.41, 9.8, 5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    02.41, 8.9, 5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 10' tail in p.a. 33 deg);
    02.39, 8.8, 2.5' (Y. Yamaguchi, 0.076-m Refractor + CCD);
    02.38, 8.8, 3.5' (O. Miyazaki, 0.32-m Newtonian);
    01.78, 9.1, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    01.76, 9.0, 9' (D. Buczynski, Tarbatness MPC I81, 0.3-m Newtonian + CCD);
    01.76, 10.2, 2' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    01.76, 9.8, 1' (A. Scholten, Bussloo, 0.356-m Schmidt-Cassegrain);
    01.38, 10.2, 0.5' (O. Miyazaki, 0.32-m Newtonian);
nov 30.81, 8.9, 8' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.23° tail in p.a. 37 deg);
    30.41, 9.6, 5.6' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    29.67, 9.2, 4' (P. Guzik, 25x100 Binoculars);
    28.74, 9.4, 4.1' (M. Phillips, Forthimage Observatory, Edinburgh UK, 0.25-m Newtonian + CCD);
    27.42, 8.9, 3.5' (O. Miyazaki, 0.32-m Newtonian);
    26.42, 9.5, 4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    25.79, 9.2, 4.3' (M. Phillips, ASERO Trevinca Skies, Spain, 0.094-m Refractor + CCD);
    25.78, 9.4, 5' (D. Buczynski, Tarbatness MPC I81, 0.35-m Schmidt-Cassegrain + CCD);
    25.77, 9.3, 5.8' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 6' tail in p.a. 35 deg);
    24.82, 9.3, 1.8' (V. Kasten, 20x80 Binoculars);
    24.79, 8.9, 5.8' (E. Bryssinck, 0.4-m Newtonian + CCD);
    24.77, 8.9, 9' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 10' tail in p.a. 39 deg);
    24.77, 9.5, 4.8' (M. Phillips, ASERO Trevinca Skies, Spain, 0.094-m Refractor + CCD);
    24.77, 9.0, 7.5' (T. Lehmann, Nerpio (remote), 0.32-m Refractor + CCD);
    23.78, 9.3, 4.5' (M. Phillips, ASERO Trevinca Skies, Spain, 0.094-m Refractor + CCD; 18' tail in p.a. 40 deg);
    23.77, 9.0, 8.6' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    23.40, 9.6, 3' (O. Miyazaki, 0.32-m Newtonian);
    22.80, 8.8, 10.2' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    22.77, 8.6, 14' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    22.75, 8.8, 5.6' (M. Paradowski, Lublin, Poland, 0.068-m Refractor + CCD);
    22.74, 9.0, 4.2' (M. Paradowski, Lublin, Poland, 0.068-m Refractor + CCD);
    22.41, 9.6, 3.5' (O. Miyazaki, 0.32-m Newtonian);
    22.40, 8.7, 5.2' (Y. Yamaguchi, 0.076-m Refractor + CCD);
    21.83, 8.7, 10' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    21.80, 9.1, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    21.80, 8.8, 3.5' (C. Harder, Jeersdorf h, 0.298-m Newtonian);
    21.43, 8.4, 3.6' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    21.43, 8.8, 5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    21.42, 9.7, 4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    21.39, 8.9, 3.2' (O. Miyazaki, 0.32-m Newtonian);
    21.13, 8.9, -- (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien + CCD);
    21.07, 9.0, 3' (C. Hergenrother, Tanque Verde, Arizona, 30x125.0 Binoculars);
    20.74, 9.7, -- (U. Pilz, 16x70 Binoculars);
    20.67, 11.0, 1.5' (S. Shurpakov, 0.41-m Newtonian + CCD);
    20.43, 8.5, 7' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 15' tail in p.a. 45 deg);
    20.43, 8.3, 3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    20.43, 9.5, 5.5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    20.38, 9.4, 2.6' (O. Miyazaki, 0.32-m Newtonian);
    20.07, 8.9, 3.5' (C. Hergenrother, Tanque Verde, Arizona, 30x125.0 Binoculars);
    19.78, 9.4, -- (J. Czyz, Erding / Bavaria, 25x100 Binoculars);
    19.78, 8.4, 11' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 21' tail in p.a. 46 deg);
    19.78, 9.0, 7' (R. Arnold, Trevinca, Spain, 0.094-m Refractor);
    19.78, 9.0, 4.7' (M. Phillips, ASERO Trevinca Skies, Spain, 0.094-m Refractor + CCD; 18' tail in p.a. 44 deg);
    19.72, 9.0, 3' (M. Meyer, 0.152-m Refractor);
    19.40, 9.3, 2.5' (O. Miyazaki, 0.32-m Newtonian);
    19.39, 9.0, 3' (Y. Sugiyama, 0.12-m Refractor);
    19.12, 8.4, 6.8' (K. Yoshimoto, 0.431-m Newtonian + CCD; 14' tail in p.a. 45 deg);
    19.06, 8.8, 2.5' (C. Hergenrother, 30x125.0 Binoculars);
    19.03, 9.1, 1.9' (D. Zubenel, De Soto, Kansas., 0.318-m Newtonian);
    18.81, 8.9, 3' (R. Arnold, Trevinca, Spain, 0.94-m Refractor; 10' tail);
    18.81, 8.6, 8.5' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.74, 8.4, 13' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.27° tail in p.a. 44 deg);
    18.74, 9.2, 3' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.25-m Cassegrain reflector);
    18.70, 8.7, 3' (V. Bespalov, Moscow region, Ruza district, 0.2-m Newtonian);
    18.40, 10.1, 1.6' (O. Miyazaki, 0.32-m Newtonian);
    18.17, 8.6, 7.2' (D. Heggie, UDRO, Utah, 0.15-m Refractor + CCD; 8' tail in p.a. 49 deg);
    18.09, 8.5, 12' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.2° tail in p.a. 46 deg);
    17.82, 8.3, 7.71' (K. Hills, 0.5-m Newtonian + CCD);
    17.82, 9.0, 5' (D. Buczynski, Tarbatness MPC I81, 0.35-m Schmidt-Cassegrain + CCD);
    17.81, 9.0, 3.6' (V. Kasten, 20x80 Binoculars);
    17.74, 9.3, 3' (C. Harder, Jeersdorf f, 0.298-m Newtonian);
    17.74, 8.9, 5.5' (P. Dekelver, 0.3-m Newtonian + CCD);
    17.74, 8.7, 4' (D. Vansteelant, Varsenare, 0.3-m Newtonian);
    17.71, 9.2, 2' (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);
    17.40, 8.8, 1.6' (O. Miyazaki, 0.32-m Newtonian);
    16.95, 9.7, 4.32' (D. Buczynski, Tarbatness MPC I81, 0.35-m Schmidt-Cassegrain + CCD);
    16.82, 8.8, 7' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    16.81, 9.0, 4.7' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    16.80, 9.2, 1.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
    16.77, 8.9, 3' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.25-m Cassegrain reflector);
    16.49, 9.5, -- (J. Pile, Bulacan, Philippines, 0.06-m "small telescopes and finders" with aperture not exceeding 4 inches);
    15.84, 8.9, 3.2' (M. Mašek, 0.25-m Schmidt-Cassegrain + CCD);
    15.84, 8.9, 5.9' (M. Mašek, 0.25-m Schmidt-Cassegrain + CCD);
    15.83, 9.1, 4.3' (R. Arnold, Dunhallin Skye, 0.2-m Schmidt-Cassegrain + CCD);
    15.82, 8.9, 4.9' (D. Buczynski, Tarbatness MPC I81, 0.35-m Schmidt-Cassegrain + CCD);
    15.79, 9.0, 3' (M. Reszelski, Szamotuly, Poland, 25x100 Binoculars);
    15.75, 10.3, 6.2' (P. Dekelver, 0.3-m Newtonian + CCD);
    15.74, 9.2, 14' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.17° tail in p.a. 38 deg);
    15.74, 8.9, 3.76' (N. James, 0.28-m Schmidt-Cassegrain + CCD);
    15.74, 8.6, -- (G. Scheerle, 9x63.0 Binoculars);
    15.74, 8.6, 4' (G. Scheerle, 0.235-m Schmidt-Cassegrain);
    15.71, 9.0, 3' (P. Guzik, 25x100 Binoculars);
    15.41, 9.9, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    15.41, 9.2, 2.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    15.41, 8.5, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    15.40, 9.4, 0.4' (O. Miyazaki, 0.32-m Newtonian);
    14.86, 9.5, 6.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    14.85, 10.1, -- (V. Díaz, La Romana, Alicante, Spain, 0.3-m Newtonian);
    14.40, 10.9, 2.2' (O. Miyazaki, 0.32-m Newtonian);
    13.87, 10.7, 5.2' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    13.75, 10.5, 4' (P. Guzik, 25x100 Binoculars);
    13.73, 11.0, 2' (G. Pappa, Pedara,Sicily,Italy, 0.3-m Camera lens + CCD);
    13.72, 11.2, 3.01' (N. Quinn, 0.28-m Schmidt-Cassegrain + CCD);
    13.45, 10.5, 2.5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    13.45, 11.1, 3.1' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    13.44, 11.7, 3.1' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    12.84, 10.7, 5.08' (K. Hills, 0.5-m Newtonian + CCD);
    12.78, 10.7, 7.5' (D. Buczynski, Tarbatness MPC I81, 0.3-m Newtonian + CCD);
    12.77, 10.1, 3.5' (C. Harder, Jeersdorf f, 0.298-m Newtonian);
    12.41, 10.6, 5' (Y. Yamaguchi, 0.076-m Refractor + CCD);
    11.85, 10.5, 7.3' (P. Dekelver, 0.3-m Newtonian + CCD);
    11.76, 11.0, 4.14' (N. James, 0.28-m Schmidt-Cassegrain + CCD);
    10.86, 10.7, 2.1' (V. Díaz, La Romana, Alicante, Spain, 0.25-m Newtonian);
    10.73, 11.6, 3.95' (N. Quinn, 0.28-m Schmidt-Cassegrain + CCD);
    10.72, 12.7, 1.55' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD);


13P/Olbers
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 09.55, 17.3, 0.3' (A. Pearce, Nedlands, W. Australia, 0.35-m Schmidt-Cassegrain + CCD);
    07.56, 17.4, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    03.58, 17.6, 0.3' (A. Pearce, Nedlands, W. Australia, 0.35-m Schmidt-Cassegrain + CCD);
    02.55, 17.4, 0.3' (A. Pearce, Nedlands, W. Australia, 0.35-m Schmidt-Cassegrain + CCD);
nov 12.08, 19.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 25.25, 15.0, 0.94' (K. Hills, 0.5-m Newtonian + CCD);
    23.25, 15.6, 1.13' (K. Hills, 0.5-m Newtonian + CCD);
    22.14, 13.6, 3.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    22.13, 13.0, -- (G. Pappa, Namibia (remote control), 0.11-m Refractor + CCD);
    19.07, 14.4, 2.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.26, 15.0, 1.5' (K. Hills, 0.5-m Newtonian + CCD);
    18.11, 13.7, 0.9' (W. Kutschera, 0.54-m Newtonian);
    16.26, 15.1, 1.5' (K. Hills, 0.5-m Newtonian + CCD);
    15.74, 15.3, 0.5' (K. Harikae, 0.15-m Newtonian + CCD);
    15.53, 12.2, 8.5' (T. Lehmann, Utah (remote), 0.28-m Newtonian + CCD; 0.09° tail in p.a. 301 deg);
    12.10, 16.3, 0.4' (P. Dekelver, 0.3-m Newtonian + CCD);


30P/Reinmuth
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 26.77, 18.5, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);
    15.83, 17.3, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD);
    13.99, 18.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    13.91, 17.4, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD);


32P/Comas Sola
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 09.54, 14.9, 0.7' (A. Pearce, Nedlands, W. Australia, 0.35-m Schmidt-Cassegrain + CCD);
    06.79, 14.3, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    05.50, 13.5, 1' (C. Wyatt, 0.4-m Newtonian);
    03.49, 14.3, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    01.77, 15.0, 0.5' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
nov 30.85, 14.6, 1.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.7' tail in p.a. 90 deg);
    25.92, 16.3, 0.9' (M. Lombardo, Scandicci ( Zen observatory), 0.3-m Ritchey-Chretien + CCD);
    22.10, 14.5, 0.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    21.84, 14.3, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    20.73, 15.6, 0.38' (S. Shurpakov, 0.41-m Newtonian + CCD);
    18.95, 14.2, 1.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    15.90, 14.0, 1.32' (D. Buczynski, Tarbatness I81, 0.35-m Schmidt-Cassegrain + CCD);
    15.89, 14.1, 1.8' (P. Dekelver, 0.3-m Newtonian + CCD; 8.6' tail in p.a. 246 deg);
    15.86, 14.3, 2.2' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.09° tail in p.a. 246 deg);
    14.01, 14.1, 3.2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD; 0.07° tail in p.a. 245 deg);
    12.06, 14.9, 0.75' (K. Hills, 0.5-m Newtonian + CCD);
    11.99, 14.2, 1.5' (P. Dekelver, 0.3-m Newtonian + CCD; 3.6' tail in p.a. 246 deg);


62P/Tsuchinshan
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 10.12, 8.8, 5.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 7.9' tail in p.a. 346 deg);
    09.27, 9.2, 4' (M. Goiato, 20x100 Binoculars);
    08.78, 10.2, 5.5' (O. Miyazaki, 0.32-m Newtonian);
    07.80, 8.9, 11.5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD; 8' tail in p.a. 295 deg);
    05.94, 9.0, 8' (P. Guzik, 25x100 Binoculars);
nov 28.21, 9.8, 3' (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);
    26.20, 9.0, 17' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 6' tail in p.a. 281 deg);
    24.81, 10.3, 4.9' (O. Miyazaki, 0.32-m Newtonian);
    24.22, 9.3, 9.9' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    24.22, 10.1, 4' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain);
    23.80, 10.5, 3.8' (O. Miyazaki, 0.32-m Newtonian);
    23.75, 10.0, 4.4' (K. Harikae, 0.15-m Newtonian + CCD);
    22.80, 10.8, 4.2' (O. Miyazaki, 0.32-m Newtonian);
    22.52, 9.8, 5' (C. Hergenrother, Tanque Verde, Arizona, 30x125.0 Binoculars);
    22.20, 9.5, 11.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    22.17, 9.6, 5.5' (M. Meyer, 0.152-m Refractor);
    22.07, 9.2, 15' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1.9' tail in p.a. 289 deg);
    22.04, 10.0, 4' (C. Harder, Jeersdorf h, 0.298-m Newtonian);
    22.00, 10.3, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    21.98, 9.9, 4' (T. Karhula, Virsbo, Sweden, 0.12-m Refractor);
    21.80, 10.5, 3' (O. Miyazaki, 0.32-m Newtonian);
    20.80, 9.6, 4.2' (O. Miyazaki, 0.32-m Newtonian);
    20.74, 10.1, 5.3' (K. Harikae, 0.15-m Newtonian + CCD);
    20.20, 9.0, 17' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 4' tail in p.a. 286 deg);
    19.80, 10.8, 3.6' (O. Miyazaki, 0.32-m Newtonian);
    19.50, 10.1, 7' (R. Arnold, Trevinca, Spain, 0.094-m Refractor);
    19.20, 9.4, 16' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    19.07, 9.9, 10.1' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.80, 10.7, 2.5' (O. Miyazaki, 0.32-m Newtonian);
    18.76, 10.4, 3.8' (K. Harikae, 0.15-m Newtonian + CCD);
    18.14, 10.2, 8.2' (W. Kutschera, 0.25-m Newtonian);
    18.00, 9.5, 4.5' (C. Harder, Jeersdorf h, 0.252-m Newtonian);
    17.80, 10.3, 3.7' (O. Miyazaki, 0.32-m Newtonian);
    17.00, 9.5, 2' (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);
    16.26, 9.5, 9.59' (K. Hills, 0.5-m Newtonian + CCD);
    15.80, 10.3, 3.9' (O. Miyazaki, 0.32-m Newtonian);
    15.74, 10.2, 4.7' (K. Harikae, 0.15-m Newtonian + CCD);
    15.53, 9.6, 17' (T. Lehmann, Utah (remote), 0.28-m Newtonian + CCD; 0.31° tail in p.a. 286 deg);
    15.19, 10.0, 6' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.25-m Cassegrain reflector);
    14.20, 10.3, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    13.82, 10.7, 2' (O. Miyazaki, 0.32-m Newtonian);
    13.75, 10.9, 3.2' (K. Harikae, 0.15-m Newtonian + CCD);
    13.09, 10.1, 3' (C. Harder, Jeersdorf h, 0.298-m Newtonian);
    12.93, 10.2, 5' (P. Guzik, 25x100 Binoculars);
    12.14, 8.6, 5.5' (P. Dekelver, 0.3-m Newtonian + CCD; 1.9' tail in p.a. 286 deg);
    11.28, 10.5, 2.5' (M. Goiato, 0.22-m Newtonian);
    10.80, 11.0, 2.3' (O. Miyazaki, 0.32-m Newtonian);


71P/Clark
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 13.96, 19.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


103P/Hartley
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 08.77, 11.5, 1.5' (O. Miyazaki, 0.32-m Newtonian);
    01.33, 10.1, 10' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.09° tail in p.a. 288 deg);
nov 30.28, 10.0, 11' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.09° tail in p.a. 290 deg);
    29.33, 10.0, 11' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.11° tail in p.a. 289 deg);
    29.19, 10.0, 10' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.06° tail in p.a. 291 deg);
    28.48, 10.0, 11' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 1.8' tail in p.a. 301 deg);
    28.30, 10.0, 12' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.15° tail in p.a. 288 deg);
    26.54, 9.9, 10' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD);
    26.42, 10.1, 10' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.08° tail in p.a. 296 deg);
    26.19, 10.1, 9.5' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.13° tail in p.a. 290 deg);
    26.10, 10.3, 8.5' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.13° tail in p.a. 288 deg);
    25.26, 10.0, 9.02' (K. Hills, 0.5-m Newtonian + CCD);
    24.82, 10.6, 2.9' (O. Miyazaki, 0.32-m Newtonian);
    24.20, 10.2, 3' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain);
    23.81, 11.1, 4.1' (O. Miyazaki, 0.32-m Newtonian);
    23.76, 10.9, 3.2' (K. Harikae, 0.15-m Newtonian + CCD);
    23.34, 9.4, 18' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.3° tail in p.a. 289 deg);
    22.82, 11.0, 2.3' (O. Miyazaki, 0.32-m Newtonian);
    22.51, 9.9, 3' (C. Hergenrother, Tanque Verde, Arizona, 30x125.0 Binoculars);
    22.50, 9.5, 13' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.1° tail in p.a. 291 deg);
    22.18, 10.2, 9.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    22.16, 9.6, 4.5' (M. Meyer, 0.152-m Refractor);
    22.11, 9.7, 15' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.33° tail in p.a. 291 deg);
    22.11, 9.6, 14' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.33° tail in p.a. 290 deg);
    22.03, 9.7, 13' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.33° tail in p.a. 289 deg);
    21.81, 11.0, 2.9' (O. Miyazaki, 0.32-m Newtonian);
    21.53, 9.7, 13' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.15° tail in p.a. 288 deg);
    21.43, 9.7, 13' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.14° tail in p.a. 289 deg);
    20.82, 11.1, 2.2' (O. Miyazaki, 0.32-m Newtonian);
    20.74, 11.3, 2.5' (K. Harikae, 0.15-m Newtonian + CCD; 4' tail in p.a. 290 deg);
    20.33, 9.3, 16' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.3° tail in p.a. 287 deg);
    19.81, 10.4, 2.3' (O. Miyazaki, 0.32-m Newtonian);
    19.09, 10.0, 9.2' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.81, 11.0, 2.9' (O. Miyazaki, 0.32-m Newtonian);
    18.76, 10.9, 3.1' (K. Harikae, 0.15-m Newtonian + CCD; 5' tail in p.a. 283 deg);
    18.34, 9.3, 17' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.19° tail in p.a. 288 deg);
    18.19, 9.4, 15' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.26° tail in p.a. 288 deg);
    18.18, 10.0, 3.8' (W. Kutschera, 0.25-m Newtonian);
    18.12, 9.4, 15' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.42° tail in p.a. 286 deg);
    17.81, 10.1, 3.5' (O. Miyazaki, 0.32-m Newtonian);
    17.45, 9.4, 11' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD);
    17.36, 9.3, 14' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.26° tail in p.a. 288 deg);
    16.34, 9.2, 16' (T. Lehmann, Chile (remote), 0.18-m Newtonian + CCD; 0.52° tail in p.a. 286 deg);
    16.17, 9.5, 13' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.42° tail in p.a. 287 deg);
    16.08, 9.4, 15' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.38° tail in p.a. 286 deg);
    15.82, 10.3, 3.5' (O. Miyazaki, 0.32-m Newtonian);
    15.74, 10.9, 2.5' (K. Harikae, 0.15-m Newtonian + CCD; 6' tail in p.a. 290 deg);
    15.22, 9.8, 2' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.25-m Cassegrain reflector);
    14.46, 9.3, 17' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.39° tail in p.a. 287 deg);
    14.21, 10.6, 2' (J. de Souza Aguiar, 0.3-m Newtonian);
    13.81, 10.2, 2.6' (O. Miyazaki, 0.32-m Newtonian);
    13.74, 11.1, 2.2' (K. Harikae, 0.15-m Newtonian + CCD; 5' tail in p.a. 290 deg);
    12.16, 11.5, 3.7' (P. Dekelver, 0.3-m Newtonian + CCD);
    11.26, 10.2, 4' (M. Goiato, 0.22-m Newtonian);
    11.22, 9.9, 7.3' (P. Dekelver, 0.3-m Newtonian + CCD);
    11.18, 9.4, 11' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.07° tail in p.a. 286 deg);
    11.11, 9.2, 15' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.42° tail in p.a. 286 deg);
    10.81, 9.9, 2.2' (O. Miyazaki, 0.32-m Newtonian);


117P/Helin-Roman-Alu
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 13.95, 17.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    11.91, 15.7, 0.7' (P. Dekelver, 0.3-m Newtonian + CCD; 2.3' tail in p.a. 241 deg);


126P/IRAS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 02.78, 17.3, 0.2' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
nov 22.87, 17.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    21.89, 15.9, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    18.91, 16.5, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    15.80, 16.7, 0.34' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    11.98, 17.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    11.95, 15.3, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD; 1.1' tail in p.a. 146 deg);
    10.83, 16.4, 0.44' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD);


143P/Kowal-Mrkos
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 14.05, 21.3, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


144P/Kushida
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 07.53, 13.7, 2.3' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    05.49, 14.9, 0.5' (C. Wyatt, 0.4-m Newtonian);
    01.77, 16.0, 0.25' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
nov 30.85, 15.2, 0.8' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    30.49, 15.3, 0.6' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    24.80, 16.0, -- (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    23.86, 16.5, -- (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD);
    22.05, 13.2, 5.6' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
    21.86, 15.6, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    21.48, 16.0, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    20.93, 17.2, 0.33' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    20.76, 16.3, 0.34' (S. Shurpakov, 0.41-m Newtonian + CCD);
    18.93, 15.7, 0.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.01, 16.5, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);
    17.93, 13.6, 0.8' (W. Kutschera, 0.54-m Newtonian);
    15.91, 15.8, 0.7' (P. Dekelver, 0.3-m Newtonian + CCD);
    15.89, 14.2, 4.8' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD);
    13.97, 14.1, 4.3' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    13.89, 16.1, 0.6' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    12.05, 17.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    12.03, 16.1, 0.7' (P. Dekelver, 0.3-m Newtonian + CCD);


150P/LONEOS
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 17.26, 18.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    12.05, 18.4, 0.3' (P. Dekelver, 0.3-m Newtonian + CCD);


158P/Kowal-LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 14.10, 19.9, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


170P/Christensen
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 21.94, 16.7, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    18.99, 16.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    12.07, 17.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


207P/NEAT
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 18.89, 19.1, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.86, 19.4, 0.4' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD);
    17.90, 19.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    11.03, 19.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


209P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 17.21, 20.0, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);


227P/Catalina-LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 13.25, 19.5, -- (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
nov 16.87, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    13.87, 12.4, 0.6' (P. Dekelver, 0.3-m Newtonian + CCD);


242P/Spahr
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 25.86, 19.0, -- (G. Pappa, Spain (remote control), 0.5-m Prime focus of a reflector + CCD);


246P/NEAT
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 14.14, 18.3, 2' (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD; 9.5' tail in p.a. 65 deg);


309P/LINEAR
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 25.87, 19.7, -- (G. Pappa, Spain (remote control), 0.5-m Prime focus of a reflector + CCD);


465P/Hill
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 14.18, 19.3, -- (J. Maikner, Comet Hunter Observatory 2, 0.305-m Hyperboloid astro-camera + CCD);
    12.10, 19.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


471P
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 15.79, 16.7, 0.7' (P. Dekelver, 0.3-m Newtonian + CCD; 0.8' tail in p.a. 79 deg);
    15.79, 16.2, 1.1' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 1.3' tail in p.a. 76 deg);
    13.89, 15.9, 0.7' (P. Dekelver, 0.3-m Newtonian + CCD);
    11.89, 17.4, 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
nov 22.07, 15.9, 1.5' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);


C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 08.76, 11.2, 0.8' (O. Miyazaki, 0.32-m Newtonian);
    06.91, 12.4, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    05.50, 12.2, 2' (C. Wyatt, 0.4-m Newtonian);
    04.58, 11.8, 1' (O. Miyazaki, 0.32-m Newtonian);
nov 24.80, 12.0, 1' (O. Miyazaki, 0.32-m Newtonian);
    23.79, 11.9, 1' (O. Miyazaki, 0.32-m Newtonian);
    23.75, 12.0, 1.3' (K. Harikae, 0.15-m Newtonian + CCD);
    23.15, 12.9, 1.5' (K. Hills, 0.5-m Newtonian + CCD);
    22.79, 12.8, 0.8' (O. Miyazaki, 0.32-m Newtonian);
    22.06, 12.4, 1' (C. Harder, Jeersdorf h, 0.298-m Newtonian);
    21.97, 12.6, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
    21.79, 11.9, 0.8' (O. Miyazaki, 0.32-m Newtonian);
    20.79, 11.5, 0.8' (O. Miyazaki, 0.32-m Newtonian);
    20.74, 12.1, 1.4' (K. Harikae, 0.15-m Newtonian + CCD);
    19.79, 11.8, 1' (O. Miyazaki, 0.32-m Newtonian);
    19.03, 12.1, 3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    18.79, 12.6, 0.8' (O. Miyazaki, 0.32-m Newtonian);
    18.75, 12.2, 1.5' (K. Harikae, 0.15-m Newtonian + CCD);
    17.78, 12.3, 1' (O. Miyazaki, 0.32-m Newtonian);
    16.23, 12.6, 2.07' (K. Hills, 0.5-m Newtonian + CCD);
    16.06, 12.2, 4.7' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.47° tail in p.a. 185 deg);
    15.78, 12.4, 0.6' (O. Miyazaki, 0.32-m Newtonian);
    15.75, 12.8, 1.2' (K. Harikae, 0.15-m Newtonian + CCD);
    14.79, 11.5, 1.4' (O. Miyazaki, 0.32-m Newtonian);
    13.79, 12.1, 1.1' (O. Miyazaki, 0.32-m Newtonian);
    13.75, 12.4, 1.4' (K. Harikae, 0.15-m Newtonian + CCD);
    12.18, 12.8, 1.69' (K. Hills, 0.5-m Newtonian + CCD);
    12.01, 12.1, 3.7' (P. Dekelver, 0.3-m Newtonian + CCD; 2.3' tail in p.a. 209 deg);


C/2019 U5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 22.09, 14.0, 1.7' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.11° tail in p.a. 42 deg);


C/2020 K1 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 05.46, 14.4, 0.7' (C. Wyatt, 0.4-m Newtonian);


C/2020 V2 (ZTF)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 05.48, 11.8, 2.5' (C. Wyatt, 0.4-m Newtonian; 3.8' tail in p.a. 46 deg);
nov 18.98, 11.1, 7.8' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.54° tail in p.a. 36 deg);
    16.53, 11.0, 2' (M. Mattiazzo, Swan Hill, Victoria, 0.28-m Cassegrain reflector);


C/2020 Y2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 26.76, 17.9, -- (G. Pappa, Piemonte,Italy (remote control), 0.2-m Ritchey-Chretien + CCD);
    11.99, 17.7, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2021 A9 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 25.01, 18.5, -- (G. Pappa, Piemonte,Italy (remote control), 0.3-m Ritchey-Chretien + CCD);


C/2021 S3 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 25.30, 11.2, 2' (M. Goiato, 0.22-m Newtonian);
    22.08, 11.3, 4.7' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 0.29° tail in p.a. 245 deg);


C/2021 S4 (Tsuchinshan)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 20.78, 17.6, 0.14' (S. Shurpakov, 0.41-m Newtonian + CCD);
    11.15, 17.5, 0.5' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.6' tail in p.a. 265 deg);


C/2021 X1 (Maury-Attard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 02.77, 16.7, 0.7' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    01.82, 16.6, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);
nov 20.71, 17.3, 0.29' (S. Shurpakov, 0.41-m Newtonian + CCD; 0.5' tail in p.a. 72 deg);
    18.87, 16.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    17.88, 16.9, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    15.86, 16.3, 0.56' (D. Buczynski, Tarbatness MPC I81, 0.35-m Schmidt-Cassegrain + CCD);
    15.82, 15.8, 1.2' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.23° tail in p.a. 100 deg);
    15.81, 15.5, 1.5' (P. Dekelver, 0.3-m Newtonian + CCD; 13.2' tail in p.a. 103 deg);
    15.80, 16.0, 0.36' (R. Arnold, Skye, Scotland, 0.2-m Schmidt-Cassegrain);
    11.88, 15.9, 0.7' (P. Dekelver, 0.3-m Newtonian + CCD; 7.8' tail in p.a. 102 deg);
    11.01, 17.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2022 A2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 17.86, 17.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    15.75, 14.9, 2.3' (T. Lehmann, Italy (remote), 0.2-m Newtonian + CCD; 0.14° tail in p.a. 6 deg);
    10.96, 17.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2022 E2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 19.12, 14.2, 0.8' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);


C/2022 JK5 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 05.47, 15.0, 0.4' (C. Wyatt, 0.4-m Newtonian);
nov 18.96, 14.8, 2.1' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 2' tail in p.a. 69 deg);
    15.93, 16.1, 0.56' (K. Hills, 0.5-m Newtonian + CCD);
    12.53, 16.2, 0.3' (A. Pearce, 0.35-m Schmidt-Cassegrain + CCD);
    10.97, 16.1, 0.56' (K. Hills, 0.5-m Newtonian + CCD);
    10.56, 16.2, 0.3' (A. Pearce, 0.35-m Schmidt-Cassegrain + CCD);


C/2022 N2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 11.86, 18.2, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2022 QE78 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 19.01, 16.7, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    12.12, 17.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2022 S4 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 12.02, 17.4, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2022 U1 (Leonard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 24.93, 17.0, -- (G. Pappa, Piemonte,Italy (remote control), 0.3-m Ritchey-Chretien + CCD);


C/2022 U3 (Bok)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 23.15, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    22.12, 17.4, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    12.15, 18.0, 0.38' (K. Hills, 0.5-m Newtonian + CCD);
    12.07, 17.5, 0.4' (P. Dekelver, 0.3-m Newtonian + CCD);


C/2023 A3 (Tsuchinshan-ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 07.87, 14.7, 0.4' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
nov 28.24, 14.5, -- (G. van Buitenen, Dordrecht, NL (G06), 0.203-m Ritchey-Chretien + CCD);


C/2023 E1 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 18.94, 14.9, 3.2' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD);
    14.88, 19.3, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2023 H2 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 09.99, 8.9, 8' (M. Goiato, 20x100 Binoculars);
    09.98, 9.0, 7' (M. Goiato, 0.22-m Newtonian);
    05.44, 9.4, 5.5' (C. Wyatt, 0.4-m Newtonian);
    04.47, 9.5, 4' (M. Mattiazzo, Swan Hill, Victoria, 25x100 Binoculars);
    02.79, 8.9, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain);
nov 27.41, 8.6, 2.4' (O. Miyazaki, 0.32-m Newtonian);
    23.39, 9.5, 3.9' (O. Miyazaki, 0.32-m Newtonian);
    22.39, 9.3, 2.8' (O. Miyazaki, 0.32-m Newtonian);
    21.81, 7.8, 6' (G. Pappa, Namibia (remote control), 0.11-m Refractor + CCD);
    21.80, 8.4, 11' (T. Lehmann, Hakos (remote), 0.2-m Newtonian + CCD; 0.4° tail in p.a. 70 deg);
    20.08, 7.5, 6' (C. Hergenrother, Tanque Verde, Arizona, 30x125.0 Binoculars);
    18.77, 7.5, 10' (J. Navarro Pina, La Laguna ( Parque Natural Carrascoy , Murcia , Spain ), 20x80 Binoculars);
    18.68, 7.6, 7' (T. Karhula, Virsbo, Sweden, 25x100 Binoculars);
    18.65, 8.0, 5' (V. Bespalov, Moscow region, Ruza district, 0.2-m Newtonian);
    18.39, 7.4, 10' (O. Miyazaki, 11x80 Binoculars);
    17.80, 7.5, 12' (J. Navarro Pina, El Valle ( Murcia , Spain ), 20x80 Binoculars);
    17.76, 7.8, 10.2' (W. Kutschera, 0.13-m Newtonian);
    17.73, 8.1, 7' (C. Harder, Jeersdorf f, 0.298-m Newtonian);
    17.39, 7.4, 8.2' (O. Miyazaki, 11x80 Binoculars);
    16.98, 7.5, 10' (M. Goiato, 20x100 Binoculars);
    16.80, 8.0, 5' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.25-m Schmidt reflector);
    16.77, 7.5, 14' (D. Heggie, ASERO, Trevinca, Spain, 0.094-m Refractor + CCD; 9' tail in p.a. 73 deg);
    16.77, 6.3, 18' (J. Gonzalez Suarez, 10x50 Binoculars);
    16.45, 7.0, 9' (M. Mattiazzo, Swan Hill, Victoria, 8x40 Binoculars);
    15.90, 7.4, 13' (J. Navarro Pina, Sierra de Carrascoy ( Murcia , Spain ), 20x80 Binoculars);
    15.81, 7.2, 15' (J. Navarro Pina, Puerto de la Cadena ( Murcia , Spain ), 20x80 Binoculars);
    15.79, 7.0, 6' (P. De Schrijver, Beert, 15x80 Binoculars);
    15.76, 7.0, 11' (V. Gonano, Udine, Italy, 10x50 Binoculars);
    15.75, 7.4, 10' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.15-m Refractor);
    15.72, 7.4, 16' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    15.72, 8.0, 12.8' (P. Dekelver, 0.3-m Newtonian + CCD);
    15.46, 6.7, 12' (M. Mattiazzo, Swan Hill, Victoria, 8x40 Binoculars);
    15.39, 7.2, 18' (O. Miyazaki, 7x50 Binoculars);
    15.12, 6.9, 31' (T. Lehmann, Utah (remote), 0.106-m Refractor + CCD; 0.74° tail in p.a. 67 deg);
    14.92, 6.8, 8' (J. de Souza Aguiar, 25x100 Binoculars);
    14.86, 6.8, 16' (V. Díaz, La Romana, Alicante, Spain, 15x65.0 Binoculars);
    14.84, 7.5, 14.3' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    14.74, 6.8, 10' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.152-m Refractor);
    14.74, 6.6, 12' (P. Guzik, 10x42.0 Binoculars);
    14.40, 6.5, 12' (C. Wyatt, 0.05-m Refractor);
    14.39, 7.0, 10' (O. Miyazaki, 7x50 Binoculars);
    13.93, 6.6, 8' (J. de Souza Aguiar, 25x100 Binoculars);
    13.85, 7.2, 15.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);
    13.85, 6.6, 13.91' (K. Hills, 0.5-m Newtonian + CCD);
    13.84, 7.8, 11' (P. Dekelver, 0.3-m Newtonian + CCD);
    13.81, 7.0, 12' (C. Harder, Jeersdorf f, 0.252-m Newtonian);
    13.78, 7.1, 15' (J. Navarro Pina, Puerto de la Cadena ( Murcia , Spain ), 20x80 Binoculars);
    13.76, 6.6, 15' (A. Scholten, Bussloo, 15x80 Binoculars);
    13.75, 7.1, 12' (V. Kasten, 15x50 Binoculars);
    13.75, >6.6, 7' (D. Hennig, West Kelowna, BC - visiting. (NELM 5.0), 15x50 Binoculars; 21' tail in p.a. 90 deg);
    13.74, 6.4, 14' (P. Guzik, 10x42.0 Binoculars);
    13.73, 6.5, 15' (G. Pappa, Pedara,Sicily,Italy, Nonex50 Binoculars);
    13.72, 6.7, 8' (G. Pappa, Pedara,Sicily,Italy, 0.3-m Camera lens + CCD);
    13.71, 6.1, 15' (M. Paradowski, 0.034-m Camera lens + CCD);
    13.68, 6.9, 16' (J. Powichrowski, Knyszyn, 7x50 Binoculars);
    13.40, 8.1, 9' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    13.40, 8.9, 1.2' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    13.40, 7.0, 10.5' (K. Yoshimoto, 0.203-m Ritchey-Chretien + CCD);
    13.06, 6.4, 14' (C. Hergenrother, Tanque Verde, Arizona, 10x50 Binoculars);
    13.02, 6.8, 13.5' (D. Zubenel, Linn County, Kansas. USA, 0.108-m Newtonian);
    12.96, 6.3, 18' (M. Goiato, 7x50 Binoculars);
    12.95, 6.4, 10' (W. Souza, 20x80 Binoculars);
    12.95, 6.5, 15' (M. Goiato, 20x100 Binoculars);
    12.93, 6.5, 12' (J. de Souza Aguiar, 25x100 Binoculars);
    12.92, 5.9, 23' (J. Gonzalez Suarez, Demues - Onis, Asturias, Spain, 10x50 Binoculars);
    12.78, 6.9, 10' (M. Biely, Czech Republic, Brno, 20x80 Binoculars);
    12.77, 7.1, 16.5' (J. Navarro Pina, Puerto de la Cadena ( Murcia , Spain ), 20x80 Binoculars);
    12.77, 7.0, 13' (V. Kasten, 15x50 Binoculars);
    12.76, 7.0, 11' (C. Harder, Jeersdorf f, 0.198-m Newtonian);
    12.75, 7.5, -- (A. Russo, Gibraltar, 15x50 Binoculars);
    12.46, 7.7, 7.8' (Y. Yamaguchi, 0.076-m Refractor + CCD);
    12.46, 6.5, 15' (M. Mattiazzo, Swan Hill, Victoria, 8x40 Binoculars);
    12.43, 7.4, 12.1' (Y. Yamaguchi, 0.076-m Refractor + CCD);
    11.94, 6.2, 15' (M. Goiato, 7x50 Binoculars);
    11.87, 8.6, 7.3' (P. Dekelver, 0.3-m Newtonian + CCD; 13.7' tail in p.a. 60 deg);
    11.86, 6.0, 22' (P. Pérez Corujo, La Lechuza. Vega de San Mateo. Gran Canaria, 20x80 Binoculars);
    11.82, 6.5, 15' (G. Pappa, Pedara,Sicily, 0.3-m Camera lens + CCD);
    11.80, 6.9, 10' (J. Navarro Pina, Sierra de Carrascoy ( Murcia , Spain ), 20x80 Binoculars);
    11.78, 6.8, 10' (G. Pappa, Pedara,Sicily, 12x50 Binoculars);
    11.76, 6.3, 10' (M. Deconinck, Artignosc-sur-Verdon, Provence, France, 0.152-m Refractor);
    11.75, 7.6, 9.96' (N. James, 0.28-m Schmidt-Cassegrain + CCD);
    11.75, 6.9, 17.48' (N. James, 0.072-m Refractor + CCD);
    11.75, 6.6, 27' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    11.72, 6.8, 15' (A. Scholten, Bussloo, 15x80 Binoculars);
    11.44, 6.7, 15' (J. Pile, San Rafael, Bulacan, 0.06-m "small telescopes and finders" with aperture not exceeding 4 inches);
    11.07, 6.1, 15' (C. Hergenrother, 10x50 Binoculars);
    11.05, 6.2, 16' (D. Zubenel, Hoyt, Kansas, USA, 0.108-m Newtonian);
    10.81, 6.9, 11' (V. Díaz, La Romana, Alicante, Spain, 20x80 Binoculars);
    10.77, 6.7, -- (J. Chambó Bris, Valles, Valencia, Spain, 0.2-m Newtonian + CCD);
    10.73, 9.9, 3.3' (S. Shurpakov, 0.2-m Schmidt-Newtonian + CCD);


C/2023 P1 (Nishimura)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 08.80, 15.2, 1.3' (A. Pearce, Nedlands, W. Australia, 0.35-m Schmidt-Cassegrain + CCD; 0.04° tail in p.a. 81 deg);
nov 22.13, 11.5, 2' (G. Pappa, Namibia (remote control), 0.11-m Refractor + CCD; 8' tail);
    22.09, 10.6, 6.5' (T. Lehmann, Hakos (remote), 0.106-m Refractor + CCD; 1.22° tail in p.a. 86 deg);
    13.32, 11.3, 4.1' (M. Mašek, 0.107-m Camera lens + CCD; 10.4' tail in p.a. 87 deg);
    13.32, 9.8, 7.2' (M. Mašek, 0.107-m Camera lens + CCD; 8.8' tail in p.a. 86 deg);


C/2023 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 12.03, 17.6, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


C/2023 S2 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 20.70, 18.5, 0.34' (S. Shurpakov, 0.41-m Newtonian + CCD);
    15.77, 14.0, 2' (S. Fritsche, Koeditz, 0.1-m Refractor + CCD);
    13.73, 13.5, -- (G. Pappa, Pedara,Sicily,Italy, 0.3-m Camera lens + CCD);


C/2023 S3 (Lemmon)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
dec 05.45, 14.6, 0.6' (C. Wyatt, 0.4-m Newtonian);
    04.51, 14.7, 1' (M. Mattiazzo, Swan Hill, Victoria, 0.28-m Schmidt reflector + CCD);
nov 18.84, 16.2, -- (G. Pappa, Namibia (remote control), 0.2-m Newtonian + CCD);


C/2023 V5 (Leonard)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 17.71, 17.5, -- (G. Pappa, Piemonte,Italy (remote control), 0.3-m Ritchey-Chretien + CCD);


P/2023 M4 (ATLAS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 10.91, 18.1, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


P/2023 S1
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 13.98, 18.8, 0.38' (K. Hills, 0.5-m Newtonian + CCD);


P/2023 V2 (PANSTARRS)
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2023
nov 18.97, 16.9, 0.4' (P. Carson, PGC Observatory Z10, Fregenal de la sierra, Spain, 0.315-m Cassegrain reflector + CCD);