Recent Comet Brightness Estimates

21P/Giacobini-Zinner
Total-magnitude and coma-diameter estimates:
2019 Feb. 25.78, 16.2, 1.1' (S. Fritsche, 0.1-m refractor)
2019 Feb. 24.81, 15.7, 1.5' (T. Lehmann, 0.2-m Newtonian reflector; 0.02-deg tail in p.a. 319)
2019 Feb. 23.80, 15.5, 1.3' (S. Fritsche, 0.1-m refractor)

38P/Stephan-Oterma
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.89, 12.6, 1.2' (J. Warell, 0.25-m Schmidt-Cassegrain; 4.0' tail in p.a. 241)
2019 Mar. 09.94, 12.9, 1' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 05.81, 12.8, 1.8' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 28.86, 12.2, 1.8' (J. Warell, 0.25-m Schmidt-Cassegrain; 0.8' tail in p.a. 208)
2019 Feb. 28.01, 12.0, 1.8' (P. Guzik, 0.326-m Newtonian reflector)
2019 Feb. 27.91, 11.0, 2.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 27.91, 12.1, 7.9' (S. Fritsche, 0.1-m refractor; 0.14-deg tail in p.a. 250)
2019 Feb. 27.84, 13.3, 1.4' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Feb. 27.82, 11.9, 2' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector; 2.2' tail in p.a. 170)
2019 Feb. 27.05, 10.9, 1.9' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2019 Feb. 26.85, 10.7, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 26.85, 11.8, 2' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 26.83, 11.7, 2' (M. Lehký, 0.2-m Newtonian reflector)
2019 Feb. 25.97, 10.9, 1.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 25.91, 12.1, 7' (T. Lehmann, 0.075-m reflector; 0.19-deg tail in p.a. 247)
2019 Feb. 25.81, 12.0, 1.1' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 25.79, 11.7, 2' (M. Lehký, 0.2-m Newtonian reflector)
2019 Feb. 24.96, 11.5, 2.1' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.96, 11.0, 4' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Feb. 24.92, 11.5, 2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Feb. 24.90, 12.0, 6.3' (S. Fritsche, 0.1-m refractor; 0.08-deg tail in p.a. 240)
2019 Feb. 24.84, 10.7, 2.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 23.94, 11.9, 8.3' (S. Fritsche, 0.1-m refractor; 0.1-deg tail in p.a. 243)
2019 Feb. 23.91, 12.2, 7' (T. Lehmann, 0.075-m reflector; 0.22-deg tail in p.a. 252)
2019 Feb. 23.90, 10.9, 2.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 23.89, 11.8, 1.2' (W. Kutschera, 0.54-m Newtonian reflector)
2019 Feb. 23.81, 11.9, 3' (U. Pilz, 0.32-m Newtonian reflector)
2019 Feb. 23.50, 12.6, 1.8' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Feb. 22.84, 11.0, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 22.82, 12.2, 2.1' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Feb. 22.78, 12.6, 1.5' (P. Guzik, 0.326-m Newtonian reflector)
2019 Feb. 21.10, 11.9, 8' (T. Lehmann, 0.106-m refractor; 0.22-deg tail in p.a. 250)

46P/Wirtanen
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.90, 12.6, 1.7' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Mar. 11.05, 11.8, 5.5' (D. Bamberger, 0.254-m Ritchey-Chretien)
2019 Mar. 10.88, 10.5, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 09.95, 10.9, 4' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 09.90, 10.6, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Mar. 09.88, 10.5, 4' (C. Labordena, La Serra, 0.15-m Newtonian reflector)
2019 Mar. 08.03, 10.3, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 05.80, 11.6, 3.3' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Mar. 05.13, 10.2, 20' (T. Lehmann, 0.106-m refractor; 0.19-deg tail in p.a. 252)
2019 Mar. 04.96, 10.3, 2.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 03.89, 10.7, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 02.89, 10.3, 5' (C. Labordena, La Serra, 0.15-m Newtonian reflector)
2019 Mar. 01.85, 10.4, 3' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Mar. 01.38, 10.2, 19' (T. Lehmann, 0.106-m refractor; 0.16-deg tail in p.a. 260)
2019 Feb. 28.86, 11.1, 3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.84, 10.5, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Feb. 28.16, 10.3, 3' (M. Reszelski, Szamotuly, Poland, 25x100 binoculars)
2019 Feb. 28.00, 10.7, 4' (P. Guzik, 0.326-m Newtonian reflector)
2019 Feb. 27.96, 9.5, 39' (S. Fritsche, 0.1-m refractor; 0.2-deg tail in p.a. 253)
2019 Feb. 27.90, 10.4, 2.9' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 27.86, 9.5, 10' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Feb. 27.84, 10.7, 4.8' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector)
2019 Feb. 27.79, 10.3, 4' (M. Meyer, 0.254-m Newtonian reflector)
2019 Feb. 27.08, 10.0, 4.1' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2019 Feb. 26.86, 9.8, 4.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 26.83, 9.1, 7.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 26.82, 10.5, 3.5' (M. Lehký, 0.2-m Newtonian reflector)
2019 Feb. 26.80, 10.3, 4' (M. Meyer, 0.254-m Newtonian reflector)
2019 Feb. 26.80, 10.0, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Feb. 25.95, 10.5, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 25.90, 11.2, 3' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 25.90, 9.7, 29' (S. Fritsche, 0.1-m refractor; 0.08-deg tail in p.a. 220)
2019 Feb. 25.78, 10.1, 3.5' (M. Meyer, 0.254-m Newtonian reflector)
2019 Feb. 25.78, 10.5, 3.5' (M. Lehký, 0.2-m Newtonian reflector)
2019 Feb. 24.97, 9.8, 6' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Feb. 24.95, 9.9, 5.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.94, 9.7, 27' (S. Fritsche, 0.1-m refractor; 0.08-deg tail in p.a. 221)
2019 Feb. 24.92, 9.4, 28' (T. Lehmann, 0.075-m reflector; 0.23-deg tail in p.a. 246)
2019 Feb. 24.89, 10.3, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Feb. 24.85, 8.8, 8' (J. Gonzalez Suarez, 25x100 binoculars)
2019 Feb. 24.83, 10.6, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 24.78, 9.9, 3.7' (M. Meyer, 0.254-m Newtonian reflector)
2019 Feb. 23.98, 9.3, 26' (S. Fritsche, 0.1-m refractor; 0.1-deg tail in p.a. 241)
2019 Feb. 23.89, 10.3, 3.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 23.86, 9.7, 6' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2019 Feb. 23.81, 10.7, 4' (U. Pilz, 0.32-m Newtonian reflector)
2019 Feb. 23.79, 9.4, 7' (M. Meyer, 0.254-m Newtonian reflector)
2019 Feb. 23.78, 9.2, 8' (M. Meyer, 0.12-m refractor)
2019 Feb. 23.49, 10.2, 4.3' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Feb. 22.83, 8.9, 10' (M. Meyer, 0.12-m refractor)
2019 Feb. 22.83, 10.1, 7.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 22.81, 9.2, 14' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Feb. 22.77, 10.2, 4' (P. Guzik, 0.326-m Newtonian reflector)
2019 Feb. 22.77, 10.0, -- (U. Pilz, 16x70 binoculars)

59P/Kearns-Kwee
Total-magnitude and coma-diameter estimates:
2019 Feb. 24.84, 17.0, 1.2' (S. Fritsche, 0.1-m refractor)
2019 Feb. 22.98, [18.5, -- (D. Bamberger, 0.254-m Ritchey-Chretien)

60P/Tsuchinshan
Total-magnitude and coma-diameter estimates:
2019 Mar. 13.02, 13.3, 0.3' (N. Paul, Slooh, Canary Island (MPC - G40), 0.5-m Schmidt-Cassegrain; 18.3' tail in p.a. 298)
2019 Mar. 08.90, 13.8, 1' (T. Karhula, Lysvik, Sweden, 0.305-m Newtonian reflector)
2019 Mar. 06.18, 13.9, 0.26' (N. Paul, Slooh, La Dehesa (MPC - W88), 0.35-m Schmidt-Cassegrain; 13.2' tail in p.a. 298)
2019 Mar. 04.44, 13.5, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Mar. 03.02, 13.3, 1.91' (M. Paradowski, Lublin, Poland, 0.075-m reflector; 0.09-deg tail in p.a. 305)
2019 Mar. 03.01, 13.5, 1.91' (M. Paradowski, Lublin, Poland, 0.075-m reflector; 0.09-deg tail in p.a. 305)
2019 Mar. 01.39, 13.5, 2.4' (T. Lehmann, 0.106-m refractor; 0.3-deg tail in p.a. 296)
2019 Feb. 28.90, 12.2, 0.6' (J. Warell, 0.25-m Schmidt-Cassegrain; 9.4' tail in p.a. 298)
2019 Feb. 28.02, 13.1, 1' (P. Guzik, 0.326-m Newtonian reflector; 0.05-deg tail in p.a. 310)
2019 Feb. 28.02, 13.6, 2.2' (S. Fritsche, 0.1-m refractor; 0.29-deg tail in p.a. 297)
2019 Feb. 27.99, 13.1, 1' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector; 5.0' tail in p.a. 295)
2019 Feb. 26.95, 13.8, 0.75' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.98, 13.2, 1.2' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Feb. 24.97, 14.1, 0.7' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.06, 13.8, 1.7' (S. Fritsche, 0.1-m refractor; 0.07-deg tail in p.a. 299)

64P/Swift-Gehrels
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.88, 13.5, 1' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Mar. 05.79, 12.2, 2.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Mar. 05.11, 12.1, 9' (T. Lehmann, 0.106-m refractor)
2019 Feb. 28.83, 13.3, 1' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 27.83, 11.9, 11' (S. Fritsche, 0.1-m refractor)
2019 Feb. 27.81, 11.4, 2.5' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector)
2019 Feb. 27.80, 12.2, 8' (T. Lehmann, 0.075-m reflector)
2019 Feb. 26.81, 11.6, 3' (M. Lehký, 0.2-m Newtonian reflector)
2019 Feb. 26.79, 10.4, 4' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 25.82, 12.6, 7.2' (S. Fritsche, 0.1-m refractor)
2019 Feb. 25.79, 10.9, 3.2' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.97, 10.7, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Feb. 24.81, 12.4, 2.5' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Feb. 23.86, 11.4, 12' (S. Fritsche, 0.1-m refractor)
2019 Feb. 23.86, 12.0, 10' (T. Lehmann, 0.075-m reflector)
2019 Feb. 23.48, 12.4, 2.3' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Feb. 22.76, 13.3, 1.5' (P. Guzik, 0.326-m Newtonian reflector)

78P/Gehrels
Total-magnitude and coma-diameter estimates:
2019 Feb. 23.77, 13.8, 1.2' (S. Fritsche, 0.1-m refractor)

123P/West-Hartley
Total-magnitude and coma-diameter estimates:
2019 Mar. 09.94, 11.8, 2.2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Mar. 09.93, 12.7, 0.9' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 07.86, 12.3, 1' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 05.82, 11.7, 1.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Mar. 05.17, 12.3, 1.5' (M. Goiato, 0.22-m Newtonian reflector)
2019 Mar. 01.94, 13.1, 0.6' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2019 Feb. 28.88, 12.6, 2.5' (J. Warell, 0.25-m Schmidt-Cassegrain; 2.9' tail in p.a. 267)
2019 Feb. 28.05, 12.7, 5.8' (S. Fritsche, 0.1-m refractor; 0.07-deg tail in p.a. 260)
2019 Feb. 28.04, 13.0, 1.5' (P. Guzik, 0.326-m Newtonian reflector)
2019 Feb. 27.88, 13.1, 1' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Feb. 27.87, 12.8, 1.1' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector; 2.0' tail in p.a. 240)
2019 Feb. 26.87, 12.5, 1.4' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector; 1.5' tail in p.a. 260)
2019 Feb. 26.02, 13.0, 3.1' (T. Lehmann, 0.2-m Newtonian reflector; 0.08-deg tail in p.a. 265)
2019 Feb. 25.91, 12.6, 2.1' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.98, 12.2, 2' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Feb. 24.95, 12.4, 1.2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Feb. 24.92, 12.5, 1.8' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector; 1.5' tail in p.a. 260)
2019 Feb. 24.10, 12.7, 5' (S. Fritsche, 0.1-m refractor; 0.05-deg tail in p.a. 266)
2019 Feb. 22.97, 13.5, 2.2' (D. Bamberger, 0.254-m Ritchey-Chretien; 3.3' tail in p.a. 248)
2019 Feb. 22.85, 13.0, 1.2' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Feb. 22.80, 13.1, 1' (P. Guzik, 0.326-m Newtonian reflector)

164P/Christensen
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.90, 16.5, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.87, 16.5, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain)

171P/Spahr
Total-magnitude and coma-diameter estimates:
2019 Feb. 28.83, 17.3, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)

240P/NEAT
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.91, 14.4, 0.5' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.88, 14.3, 0.7' (J. Warell, 0.25-m Schmidt-Cassegrain; 1.3' tail in p.a. 261)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.92, 14.0, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Mar. 09.83, 17.8, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Feb. 28.89, 15.3, 0.5' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 26.90, 17.4, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.89, 13.9, 1' (J. Warell, 0.25-m Schmidt-Cassegrain; 4.4' tail in p.a. 71)
2019 Feb. 28.87, 13.1, 1' (J. Warell, 0.25-m Schmidt-Cassegrain; 8.1' tail in p.a. 70)
2019 Feb. 28.03, 14.1, 0.8' (P. Guzik, 0.326-m Newtonian reflector)
2019 Feb. 27.99, 14.5, 3.5' (S. Fritsche, 0.1-m refractor; 0.08-deg tail in p.a. 64)
2019 Feb. 27.85, 14.6, 0.7' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector)
2019 Feb. 26.86, 13.8, 0.6' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 25.90, 14.3, 1.5' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 25.02, 14.4, 2.7' (T. Lehmann, 0.2-m Newtonian reflector; 0.12-deg tail in p.a. 66)
2019 Feb. 24.93, 14.4, 0.85' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 24.02, 14.6, 2.8' (S. Fritsche, 0.1-m refractor)
2019 Feb. 22.79, 13.5, 1' (P. Guzik, 0.326-m Newtonian reflector)

C/2016 A1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.86, 15.2, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.82, 16.5, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 27.79, 16.7, 1.2' (S. Fritsche, 0.1-m refractor; 0.01-deg tail in p.a. 129)
2019 Feb. 27.76, 16.9, 0.8' (S. Fritsche, 0.1-m refractor)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 04.40, 11.2, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Mar. 03.42, 11.1, 11' (T. Lehmann, 0.106-m refractor; 0.19-deg tail in p.a. 193)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Feb. 27.79, 11.6, 1.3' (C. Harder, Westerholz/ Germany, 0.531-m Newtonian reflector)
2019 Feb. 27.77, 15.3, 0.4' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Feb. 23.83, 13.7, 2.2' (S. Fritsche, 0.1-m refractor)
2019 Feb. 22.75, 13.1, 1' (P. Guzik, 0.326-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.97, 14.1, 0.7' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.91, 13.7, 0.5' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.16, 14.8, 3.2' (S. Fritsche, 0.1-m refractor; 0.04-deg tail in p.a. 289)
2019 Feb. 24.14, 14.6, 2.9' (S. Fritsche, 0.1-m refractor)

C/2017 K2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 11.97, 16.1, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.17, 17.1, 0.6' (T. Lehmann, 0.2-m Newtonian reflector)
2019 Feb. 28.11, 16.4, 1.6' (S. Fritsche, 0.1-m refractor)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Feb. 24.21, 13.8, 1' (S. Fritsche, 0.1-m refractor)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 23.11, 15.0, 0.3' (G. van Buitenen, Mayhill, New Mexico (H06), 0.51-m Ritchey-Chretien)
2019 Mar. 09.84, 12.3, 2.3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Feb. 27.79, 13.6, 0.6' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Feb. 25.77, 15.7, 0.8' (T. Lehmann, 0.2-m Newtonian reflector)
2019 Feb. 23.14, 15.3, 0.3' (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien)
2019 Feb. 21.61, 15.3, 0.3' (A. Novichonok, 0.36-m Ritchey-Chretien; 0.4' tail in p.a. 167)

C/2018 A3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Mar. 21.97, 16.3, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Feb. 28.81, 16.4, 0.2' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 26.92, 16.3, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)

C/2018 L2 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Feb. 28.19, 10.8, 9.4' (S. Fritsche, 0.1-m refractor; 0.05-deg tail in p.a. 298)
2019 Feb. 27.75, 12.5, 2.5' (S. Szabo, Agfalva, 0.6-m Newtonian reflector)
2019 Feb. 24.18, 10.8, 9.9' (S. Fritsche, 0.1-m refractor; 0.03-deg tail in p.a. 295)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2019 Feb. 21.42, 14.3, 1.1' (T. Lehmann, 0.28-m Newtonian reflector; 0.02-deg tail in p.a. 158)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Mar. 21.95, 16.6, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Mar. 17.51, 16.2, 0.25' (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien)
2019 Mar. 08.92, 16.6, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Feb. 28.90, 16.0, 0.3' (J. Warell, 0.25-m Schmidt-Cassegrain; 1.6' tail in p.a. 273)
2019 Feb. 27.98, 16.5, 0.7' (T. Lehmann, 0.2-m Newtonian reflector; 0.01-deg tail in p.a. 264)
2019 Feb. 26.86, 16.6, -- (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)

C/2018 Y1 (Iwamoto)
Total-magnitude and coma-diameter estimates:
2019 Mar. 22.82, 9.6, 5' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 22.81, 9.9, 5' (C. Harder, Jeersdorf, Germany h, 0.198-m Newtonian reflector)
2019 Mar. 21.83, 9.8, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Mar. 16.91, 10.7, 5.1' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Mar. 12.94, 9.5, 4' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Mar. 11.96, 8.7, 8' (M. Goiato, 20x100 binoculars)
2019 Mar. 11.82, 9.6, 8' (G. van Buitenen, Dordrecht, NL, 0.3-m Newtonian reflector)
2019 Mar. 10.88, 10.3, 4' (N. Paul, Slooh, Canary Island (MPC - G40), 0.5-m Schmidt-Cassegrain)
2019 Mar. 10.87, 9.6, 5.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 09.92, 8.9, 9' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 09.89, 9.2, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Mar. 09.87, 9.0, 5.5' (V. Díaz, La Romana, Alicante, España, 0.2-m Newtonian reflector)
2019 Mar. 09.87, 8.2, 10' (J. Gonzalez Suarez, 25x100 binoculars)
2019 Mar. 09.86, 8.5, 8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Mar. 09.86, 8.8, 8' (C. Labordena, La Serra, 0.15-m Newtonian reflector)
2019 Mar. 08.02, 9.2, 3.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 07.87, 8.6, 15' (C. Harder, Jeersdorf, Germany h, 0.3-m Newtonian reflector)
2019 Mar. 07.85, 8.3, 13' (C. Harder, Jeersdorf, Germany h, 0.15-m Newtonian reflector)
2019 Mar. 07.79, 9.0, 7' (M. Meyer, 0.254-m Newtonian reflector)
2019 Mar. 06.90, 9.5, 8.9' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Mar. 06.77, 8.3, 8.3' (S. Sementsov, 20x50 binoculars)
2019 Mar. 06.76, 8.4, 7.5' (J. Bohusz, Myślin Poland, 0.2-m Newtonian reflector)
2019 Mar. 05.87, 8.2, 7' (T. Karhula, Virsbo, Sweden, 25x100 binoculars)
2019 Mar. 05.84, 8.6, 8' (C. Harder, Jeersdorf, Germany f, 0.195-m Newtonian reflector)
2019 Mar. 05.83, 8.8, 7' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Mar. 05.80, 8.7, 7' (V. Kasten, 20x80 binoculars)
2019 Mar. 05.10, 8.5, 27' (T. Lehmann, 0.106-m refractor)
2019 Mar. 04.94, 8.9, 4.4' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 04.81, 9.3, 3' (U. Pilz, 0.105-m refractor)
2019 Mar. 04.42, 9.3, 10.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Mar. 03.87, 8.9, 6.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Mar. 03.41, 8.6, 9.5' (C. Wyatt, 11x70 binoculars)
2019 Mar. 02.91, 7.5, 13' (J. Gonzalez Suarez, 0.045-m refractor)
2019 Mar. 02.90, 7.8, 10' (J. Gonzalez Suarez, 25x100 binoculars)
2019 Mar. 02.89, 8.5, 8' (P. Guzik, 10x50 binoculars)
2019 Mar. 02.88, 8.2, 11' (J. Bohusz, Myślin Poland, 0.2-m Newtonian reflector)
2019 Mar. 02.84, 8.2, 12' (C. Labordena, La Serra, 11x80 binoculars)
2019 Mar. 02.35, 8.6, 5' (S. Rae, Karamu, New Zealand, 0.114-m Newtonian reflector)
2019 Mar. 02.00, 7.6, 35' (P. Pérez Corujo, Pico de las Nieves(San Mateo, Gran Canaria, Islas Canarias.) Spain, 0.2-m Newtonian reflector)
2019 Mar. 01.96, 8.5, 10' (P. Guzik, 10x50 binoculars)
2019 Mar. 01.84, 8.5, 5' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 28.85, 8.5, 7' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Feb. 28.84, 10.1, 7' (J. Warell, 0.25-m Schmidt-Cassegrain)
2019 Feb. 28.81, 13.7, -- (V. Bahyl, observatory "Júlia", Zvolenská Slatina, Slovak Republic, Europe, 0.235-m Schmidt-Cassegrain)
2019 Feb. 28.76, 8.4, 5.5' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 27.96, 7.8, 8' (M. Lehký, 25x100 binoculars)
2019 Feb. 27.93, 9.1, 4.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 27.92, 8.0, 12' (A. Scholten, Eerbeek, 15x80 binoculars)
2019 Feb. 27.91, 7.8, 24' (G. Scheerle, 9x63 binoculars)
2019 Feb. 27.89, 7.5, 18' (C. Harder, Westerholz/ Germany, 0.15-m Newtonian reflector)
2019 Feb. 27.89, 8.3, 13' (V. Kasten, 15x50 binoculars)
2019 Feb. 27.87, 8.0, 33' (S. Fritsche, 0.1-m refractor; 0.24-deg tail in p.a. 95)
2019 Feb. 27.85, 8.3, 6' (M. Kwinta, 0.09-m refractor)
2019 Feb. 27.84, 8.3, 10' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2019 Feb. 27.84, 8.3, 24' (T. Lehmann, 0.075-m reflector; 0.3-deg tail in p.a. 91)
2019 Feb. 27.83, 8.4, 5' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 27.83, 7.9, 15' (M. Reszelski, Szamotuly, Poland, 25x100 binoculars)
2019 Feb. 27.83, 7.8, 9' (S. Szabo, Agfalva, 8x56 binoculars)
2019 Feb. 27.82, 7.6, 15' (C. Labordena, La Serra, 11x80 binoculars)
2019 Feb. 27.77, 7.8, 11' (M. Meyer, 0.12-m refractor)
2019 Feb. 27.76, 8.0, 10' (P. Guzik, 10x50 binoculars)
2019 Feb. 26.91, 8.3, 12' (A. Scholten, Eerbeek, 15x80 binoculars)
2019 Feb. 26.90, 8.2, 10' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2019 Feb. 26.89, 8.1, 14' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 26.89, 7.8, 15' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Feb. 26.89, 8.2, 8' (V. Kasten, 15x50 binoculars)
2019 Feb. 26.89, 7.8, 8' (M. Lehký, 25x100 binoculars)
2019 Feb. 26.87, 8.6, 9.5' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2019 Feb. 26.86, 8.7, 6.6' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 26.86, 8.2, 7' (M. Kwinta, 0.09-m refractor)
2019 Feb. 26.85, 8.4, 6' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 26.81, 8.9, 6' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Feb. 26.78, 7.6, 11' (M. Meyer, 0.12-m refractor)
2019 Feb. 25.99, 8.8, 6.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 25.92, 7.9, 7' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 25.88, 7.3, 11' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Feb. 25.88, - , 11' (C. Harder, Jeersdorf, Germany f, 0.531-m Newtonian reflector)
2019 Feb. 25.87, 8.2, 13' (A. Scholten, Eerbeek, 15x80 binoculars)
2019 Feb. 25.86, 8.1, 11' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2019 Feb. 25.86, 7.5, 41' (S. Fritsche, 0.1-m refractor; 0.35-deg tail in p.a. 99)
2019 Feb. 25.84, 7.7, 35' (T. Lehmann, 0.075-m reflector; 0.52-deg tail in p.a. 97)
2019 Feb. 25.79, 7.4, 19.74' (N. James, 0.09-m refractor)
2019 Feb. 25.78, 7.9, 10' (V. Kasten, 15x50 binoculars)
2019 Feb. 25.77, 7.4, 14' (M. Meyer, 0.12-m refractor)
2019 Feb. 25.77, 7.5, 10' (M. Lehký, 20x100 binoculars)
2019 Feb. 25.00, 6.8, 15' (J. Gonzalez Suarez, 0.045-m refractor)
2019 Feb. 24.97, 7.2, 20' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Feb. 24.92, 8.0, 13' (A. Scholten, Eerbeek, 15x80 binoculars)
2019 Feb. 24.90, 7.4, 24' (G. Scheerle, 9x63 binoculars)
2019 Feb. 24.89, 7.4, 16' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Feb. 24.88, 7.7, 32' (T. Lehmann, 0.075-m reflector; 0.66-deg tail in p.a. 98)
2019 Feb. 24.87, 7.5, 10' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2019 Feb. 24.85, 7.9, 11' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2019 Feb. 24.85, 9.0, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 24.84, 7.5, 12' (P. Guzik, 10x50 binoculars)
2019 Feb. 24.83, 7.9, 10' (A. Kammerer, Schoellbronn (Black Forest), Germany, 9x63 binoculars)
2019 Feb. 24.83, 8.2, 8.1' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2019 Feb. 24.81, 7.8, 8' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 24.80, 7.2, 20.68' (N. James, 0.09-m refractor)
2019 Feb. 24.77, 7.6, 15' (M. Meyer, 0.12-m refractor)
2019 Feb. 24.77, 7.9, 10' (V. Kasten, 15x50 binoculars)
2019 Feb. 24.77, 7.5, 38' (S. Fritsche, 0.1-m refractor; 0.65-deg tail in p.a. 97)
2019 Feb. 24.46, 8.0, 8' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x100 binoculars)
2019 Feb. 23.94, 8.0, 11' (A. Scholten, Eerbeek, 15x80 binoculars)
2019 Feb. 23.94, 7.2, 30' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x80 binoculars)
2019 Feb. 23.91, 9.2, 4.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Feb. 23.91, 7.5, 36' (S. Fritsche, 0.1-m refractor; 0.2-deg tail in p.a. 101)
2019 Feb. 23.90, 7.2, 24' (G. Scheerle, 9x63 binoculars)
2019 Feb. 23.85, 7.8, 15' (W. Kutschera, 0.25-m Newtonian reflector)
2019 Feb. 23.82, 7.7, 8' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 23.82, 7.0, 14' (C. Labordena, La Serra, 11x80 binoculars)
2019 Feb. 23.81, 7.8, 11' (G. van Buitenen, Dordrecht, NL, 0.13-m Newtonian reflector)
2019 Feb. 23.81, 7.7, 30' (T. Lehmann, 0.075-m reflector; 0.39-deg tail in p.a. 96)
2019 Feb. 23.80, 7.4, 18.61' (N. James, 0.09-m refractor)
2019 Feb. 23.76, 7.4, 15' (P. Guzik, 10x50 binoculars)
2019 Feb. 23.76, 7.6, 15' (M. Meyer, 0.12-m refractor)
2019 Feb. 23.51, 8.3, 11' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Feb. 23.51, 7.7, 15' (S. Yoshida, 0.07-m refractor)
2019 Feb. 22.89, 7.6, 17' (V. Kasten, 15x50 binoculars)
2019 Feb. 22.87, 8.0, 8.8' (M. Collins, Everton, 0.103-m refractor)
2019 Feb. 22.83, 6.8, 28' (G. Scheerle, 9x63 binoculars)
2019 Feb. 22.82, 7.3, 17' (M. Meyer, 0.12-m refractor)
2019 Feb. 22.82, 7.5, 9' (M. Kwinta, 0.185-m Newtonian reflector)
2019 Feb. 22.81, 7.2, 16' (P. Guzik, 10x50 binoculars)
2019 Feb. 22.79, 7.6, 8' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars)
2019 Feb. 22.78, 7.2, 22' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Feb. 22.78, 7.8, 13' (U. Pilz, 16x70 binoculars)
2019 Feb. 22.77, 7.4, 18' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Feb. 21.90, 7.7, 18.3' (D. Bamberger, 0.254-m Ritchey-Chretien; 10.1' tail in p.a. 101)
2019 Feb. 21.89, 7.6, 9.4' (M. Collins, Everton, 0.103-m refractor)
2019 Feb. 21.86, 8.1, 15' (D. Swan, Tynemouth, UK, 0.2-m Schmidt-Cassegrain)
2019 Feb. 21.81, 6.7, 15' (C. Labordena, La Serra, 11x80 binoculars)
2019 Feb. 21.09, 7.0, 39' (T. Lehmann, 0.106-m refractor; 0.72-deg tail in p.a. 104)