Recent Comet Brightness Estimates

21P/Giacobini-Zinner
Total-magnitude and coma-diameter estimates:
2019 Jan. 18.32, 15.6, 0.5' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jan. 18.31, 15.4, 0.5' (M. Masek, 0.3-m Cassegrain reflector; 0.3' tail in p.a. 335)
2019 Jan. 12.91, 13.4, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 05.76, 15.2, 0.5' (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien)
2019 Jan. 02.96, 12.9, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.71, 14.8, 1.2' (R. Ramlow, 0.106-m refractor; 6.1' tail in p.a. 311)
2018 Dec. 29.16, 15.5, 0.5' (M. Masek, 0.3-m Cassegrain reflector)
2018 Dec. 29.15, 15.1, 0.5' (M. Masek, 0.3-m Cassegrain reflector; 0.5' tail in p.a. 323)
2018 Dec. 29.06, 13.5, 0.8' (K. Hills, 0.5-m Newtonian reflector)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2019 Jan. 06.80, 10.1, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 02.83, 13.0, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 02.78, 12.8, 0.9' (W. Kutschera, 0.54-m Newtonian reflector)
2019 Jan. 01.83, 12.4, 3.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.81, 10.1, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Dec. 31.84, 12.9, 2.8' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 27.83, 13.3, 3.1' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 27.44, [14.6, -- (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 26.83, 13.6, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 25.83, 13.6, 2.1' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 24.81, 13.4, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 22.81, 13.3, 1.3' (K. Hills, 0.5-m Newtonian reflector)

31P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2019 Jan. 15.11, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 08.10, 18.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 28.97, 18.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

38P/Stephan-Oterma
Total-magnitude and coma-diameter estimates:
2019 Jan. 16.95, 11.7, 2.9' (D. Bamberger, 0.254-m Ritchey-Chretien; 3.8' tail in p.a. 250)
2019 Jan. 16.89, 10.1, 2.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 15.00, 11.3, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 14.64, 10.4, 5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 14.25, 12.2, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 14.08, 10.3, 4' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 12.94, 10.6, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 12.60, 10.4, 5.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 11.24, 11.0, 2' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2019 Jan. 09.92, 11.1, 2.5' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2019 Jan. 09.92, 10.8, 2.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 09.10, 11.1, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 07.99, 10.7, 3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 06.84, 9.9, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.15-deg tail in p.a. 260)
2019 Jan. 06.82, 10.5, 3' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Jan. 06.00, 10.0, 3.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 04.87, 9.9, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.15-deg tail in p.a. 260)
2019 Jan. 03.79, 10.3, 2' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Jan. 03.21, 10.9, 2.5' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2019 Jan. 03.06, 10.6, 2' (W. Kutschera, 0.54-m Newtonian reflector; 0.07-deg tail)
2019 Jan. 03.03, 9.8, 6' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Jan. 02.81, 10.7, 1.8' (A. Kammerer, Freiolsheim (Black Forest), Germany, 0.203-m Schmidt-Cassegrain)
2019 Jan. 02.77, 9.9, 4.5' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Jan. 01.85, 9.9, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.15-deg tail in p.a. 260)
2019 Jan. 01.29, 10.2, 12' (R. Ramlow, 0.106-m refractor; 20.0' tail in p.a. 263)
2018 Dec. 31.62, 10.1, 5' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Dec. 31.43, 10.0, 16' (T. Lehmann, 0.106-m refractor; 0.43-deg tail in p.a. 265)
2018 Dec. 30.66, 10.0, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 30.19, 10.1, 3.5' (M. Goiato, 0.22-m Newtonian reflector)
2018 Dec. 30.14, 10.2, 3.7' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 29.84, 9.7, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.15-deg tail in p.a. 260)

46P/Wirtanen
Total-magnitude and coma-diameter estimates:
2019 Jan. 19.24, 7.0, 12' (J. Warell, Lindby Observatory (K60), Skurup, Sweden, 7x50 binoculars)
2019 Jan. 18.75, 7.6, 5' (U. Pilz, 0.105-m refractor)
2019 Jan. 18.20, 6.9, 28' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Jan. 18.19, 7.0, 20' (C. Harder, Jeersdorf, Germany f, 0.198-m Newtonian reflector)
2019 Jan. 18.18, 7.3, 20' (A. Scholten, Eerbeek, 8x56 binoculars)
2019 Jan. 16.88, 6.8, 38' (M. Collins, Everton, 10x40 binoculars)
2019 Jan. 14.96, 6.4, 42' (M. Collins, Everton, 10x40 binoculars)
2019 Jan. 14.78, 6.8, 20' (V. Kasten, 15x50 binoculars)
2019 Jan. 14.22, 6.4, 38' (M. Collins, Everton, 10x40 binoculars)
2019 Jan. 14.10, 5.6, 45' (J. Gonzalez Suarez, 0.045-m refractor)
2019 Jan. 14.00, 6.2, 38.54' (N. James, 0.09-m refractor)
2019 Jan. 12.09, 7.0, 24' (J. Fraser, Alness, Scotland., 10x50 binoculars)
2019 Jan. 11.93, 6.2, 25' (C. Labordena, La Serra, 11x80 binoculars)
2019 Jan. 10.89, 7.6, 14.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 10.00, 6.1, 30' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x80 binoculars)
2019 Jan. 09.92, 6.4, 20' (T. Karhula, Virsbo, Sweden, 10x50 binoculars)
2019 Jan. 09.92, 6.1, 25' (M. Collins, Everton, 10x40 binoculars)
2019 Jan. 09.80, 6.1, 20' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 8x25 binoculars)
2019 Jan. 09.11, 6.4, 35' (M. Collins, Everton, 10x40 binoculars)
2019 Jan. 09.03, 7.3, 45' (D. Bamberger, 0.254-m Ritchey-Chretien; 10.5' tail in p.a. 216)
2019 Jan. 08.85, 5.7, 24' (L. Entwisle, Elland,West Yorkshire, 10x50 binoculars)
2019 Jan. 08.74, 5.8, 20' (P. Camilleri, 20x80 binoculars)
2019 Jan. 08.00, 6.6, 44' (M. Collins, Everton, 10x40 binoculars)
2019 Jan. 07.98, 5.9, 38.54' (N. James, 0.09-m refractor)
2019 Jan. 07.75, 5.8, 20' (P. Camilleri, 20x80 binoculars)
2019 Jan. 07.16, 5.4, 40' (J. Gonzalez Suarez, 0.045-m refractor)
2019 Jan. 06.85, 5.5, 35' (J. Gonzalez Suarez, 0.045-m refractor)
2019 Jan. 06.82, 5.5, 26' (S. Yoshida, 0.07-m refractor)
2019 Jan. 05.84, 5.8, 20' (M. Reszelski, Szamotuły, Poland, 10x50 binoculars)
2019 Jan. 05.80, 6.4, 20' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 8x25 binoculars)
2019 Jan. 04.77, 6.1, 35' (J. Navarro Pina, Sierra de El Puerto de la Cadena ( Murcia , Spain ), 20x80 binoculars)
2019 Jan. 04.01, 5.4, 45.12' (N. James, 0.09-m refractor)
2019 Jan. 03.94, 5.6, 24' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2019 Jan. 03.80, 5.5, 30' (M. Reszelski, Szamotuły, Poland, 10x50 binoculars)
2019 Jan. 03.77, 5.5, 35' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Jan. 03.76, 5.8, 35' (V. Kasten, 15x50 binoculars)
2019 Jan. 03.19, 5.5, 35' (C. Labordena, Culla, 11x80 binoculars)
2019 Jan. 03.04, 5.9, 56' (S. Fritsche, 0.1-m refractor; 0.15-deg tail in p.a. 214)
2019 Jan. 03.02, 5.4, 24' (G. Scheerle, naked eyes)
2019 Jan. 03.01, 5.4, 18' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Jan. 03.00, 5.4, 30' (G. Scheerle, 9x63 binoculars)
2019 Jan. 02.80, 6.0, 40' (J. Navarro Pina, Sierra de El Puerto de la Cadena ( Murcia , Spain ), 20x80 binoculars)
2019 Jan. 02.79, 5.5, 20' (A. Kammerer, Freiolsheim (Black Forest), Germany, 9x63 binoculars)
2019 Jan. 02.78, 5.5, 35' (M. Meyer, 10x50 binoculars)
2019 Jan. 02.78, 5.5, 50' (C. Harder, Jeersdorf, Germany f, 8x44 binoculars)
2019 Jan. 02.77, 5.9, 60' (U. Pilz, 7x50 binoculars)
2019 Jan. 02.75, 5.6, 25' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 8x25 binoculars)
2019 Jan. 02.74, 5.7, 30' (V. Kasten, 15x50 binoculars)
2019 Jan. 02.22, 5.4, 50' (C. Harder, Jeersdorf, Germany h, 8x44 binoculars)
2019 Jan. 01.94, 5.5, 40' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 0.0015-m Newtonian reflector)
2019 Jan. 01.94, 5.5, 40' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 0.0015-m Newtonian reflector)
2019 Jan. 01.93, 5.6, 30' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 8x25 binoculars)
2019 Jan. 01.89, 5.4, 35' (C. Labordena, La Serra, 11x80 binoculars)
2019 Jan. 01.80, 5.6, 45' (J. Navarro Pina, Sierra de El Puerto de la Cadena ( Murcia , Spain ), 20x80 binoculars)
2019 Jan. 01.80, 5.0, 40' (J. Gonzalez Suarez, naked eyes)
2019 Jan. 01.79, 5.1, 45' (P. Guzik, naked eyes)
2019 Jan. 01.78, 5.2, 45' (J. Gonzalez Suarez, 0.045-m refractor)
2019 Jan. 01.77, 5.8, 22' (J. Hadač, 10x50 binoculars)
2019 Jan. 01.73, 5.3, 35' (M. Reszelski, Szamotuly, Poland, 10x50 binoculars)
2019 Jan. 01.28, 4.9, 88' (R. Ramlow, 0.106-m refractor)
2019 Jan. 01.19, 5.3, 88' (T. Lehmann, 0.106-m refractor; 0.34-deg tail in p.a. 232)
2018 Dec. 31.94, 5.7, 24' (J. Fraser, Alness, Scotland., 10x50 binoculars)
2018 Dec. 31.77, 5.9, 25' (J. Konecny, Hlivice, 25x100 binoculars)
2018 Dec. 31.75, 5.6, 30' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2018 Dec. 31.75, 4.8, 40' (M. Biely, Czech Republic, Brno, naked eyes)
2018 Dec. 31.72, 5.5, 30' (T. Csorgei, Blahova, 10x60 binoculars)
2018 Dec. 31.62, 5.6, 35' (O. Miyazaki, 5x20 binoculars)
2018 Dec. 31.61, 5.6, 40' (S. Yoshida, 0.07-m refractor)
2018 Dec. 31.61, 5.0, 40' (S. Yoshida, naked eyes)
2018 Dec. 31.06, 5.1, 97' (T. Lehmann, 0.106-m refractor; 0.78-deg tail in p.a. 240)
2018 Dec. 31.03, 5.6, 35' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x80 binoculars)
2018 Dec. 31.02, 5.7, 28' (J. Fraser, Alness, Scotland., 10x50 binoculars)
2018 Dec. 30.79, 5.5, 45' (J. Navarro Pina, Puerto de la cadena ( Murcia , Spain ), 10x50 binoculars)
2018 Dec. 30.75, 5.5, 40' (T. Karhula, Virsbo, Sweden, 8x20 binoculars)
2018 Dec. 30.71, 5.4, 40' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 8x25 binoculars)
2018 Dec. 30.64, 6.4, 22' (O. Miyazaki, 5x20 binoculars)
2018 Dec. 29.88, 6.4, 27.5' (D. Bamberger, 0.254-m Ritchey-Chretien; 8.0' tail in p.a. 190)
2018 Dec. 29.86, 5.2, 40' (C. Labordena, Culla, 11x80 binoculars)
2018 Dec. 29.82, 5.1, 45' (J. Gonzalez Suarez, 0.045-m refractor)
2018 Dec. 29.51, 6.1, 22' (K. Yoshimoto, 8x42 binoculars)
2018 Dec. 29.11, 5.1, 40' (C. Hergenrother, 2x42 binoculars)
2018 Dec. 28.90, 5.6, 25' (W. Hasubick, 8x32 binoculars)
2018 Dec. 28.90, 5.6, -- (W. Hasubick, naked eyes)
2018 Dec. 28.89, 5.5, 30' (P. Pérez Corujo, Garañón (Tejeda. Gran Canaria) , 20x80 binoculars)
2018 Dec. 28.70, 5.4, 30' (T. Karhula, Virsbo, Sweden, 7x50 binoculars)
2018 Dec. 28.54, 5.7, 25' (O. Miyazaki, 5x20 binoculars)
2018 Dec. 28.50, 5.2, 25' (Y. Nagai, 12x50 binoculars)
2018 Dec. 27.95, 5.3, 30' (G. van Buitenen, Dordrecht, NL, 10x50 binoculars)
2018 Dec. 27.89, 5.5, 35' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x80 binoculars)
2018 Dec. 27.69, 6.5, 23' (O. Miyazaki, 5x20 binoculars)
2018 Dec. 27.12, 5.7, 17' (J. Fraser, Alness, Scotland., 10x50 binoculars)
2018 Dec. 26.72, 5.4, 26' (W. Hasubick, 8x32 binoculars)
2018 Dec. 26.69, 4.4, 60' (P. Guzik, naked eyes)
2018 Dec. 25.85, 4.8, 40' (G. Scheerle, 9x63 binoculars)
2018 Dec. 25.85, 4.8, 30' (G. Scheerle, naked eyes)
2018 Dec. 25.84, 5.3, 30' (M. Meyer, 10x50 binoculars)
2018 Dec. 25.78, 5.1, 35' (G. van Buitenen, Dordrecht, NL, 10x50 binoculars)
2018 Dec. 25.11, 4.6, 107' (T. Lehmann, 0.106-m refractor; 0.43-deg tail in p.a. 195)
2018 Dec. 24.91, 5.0, 24' (G. Scheerle, 9x63 binoculars)
2018 Dec. 24.81, 6.2, 49.6' (D. Bamberger, 0.254-m Ritchey-Chretien; 18.5' tail in p.a. 178)
2018 Dec. 24.79, 6.4, 19' (M. Collins, Everton, 10x40 binoculars)
2018 Dec. 24.77, 5.0, 35' (M. Meyer, 10x50 binoculars)
2018 Dec. 24.31, 4.6, 104' (T. Lehmann, 0.106-m refractor)
2018 Dec. 24.08, 5.2, 40' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x80 binoculars)
2018 Dec. 24.08, 5.2, 40' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x800 binoculars)
2018 Dec. 24.08, 5.2, 40' (P. Pérez Corujo, Vega de San Mateo Gran Canaria. Spain, 20x8 binoculars)
2018 Dec. 23.28, 4.3, 85' (R. Ramlow, 0.106-m refractor)
2018 Dec. 22.80, 4.4, 30' (M. Biely, Czech Republic, Brno, naked eyes)

48P/Johnson
Total-magnitude and coma-diameter estimates:
2018 Dec. 29.08, 15.5, 0.5' (M. Masek, 0.3-m Cassegrain reflector; 0.6' tail in p.a. 64)
2018 Dec. 29.08, 16.0, 0.5' (M. Masek, 0.3-m Cassegrain reflector; 0.5' tail in p.a. 62)
2018 Dec. 24.87, 15.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)

49P/Arend-Rigaux
Total-magnitude and coma-diameter estimates:
2019 Jan. 09.23, 18.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 02.20, 17.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

59P/Kearns-Kwee
Total-magnitude and coma-diameter estimates:
2019 Jan. 15.10, 16.5, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 08.09, 16.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.07, 16.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

60P/Tsuchinshan
Total-magnitude and coma-diameter estimates:
2019 Jan. 13.11, 13.2, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 12.59, 13.8, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 11.26, 14.7, 0.6' (M. Masek, 0.3-m Cassegrain reflector; 3.7' tail in p.a. 294)
2019 Jan. 11.26, 15.6, 0.4' (M. Masek, 0.3-m Cassegrain reflector; 1.2' tail in p.a. 298)
2019 Jan. 11.25, 14.3, 0.6' (M. Masek, 0.3-m Cassegrain reflector; 3.7' tail in p.a. 295)
2019 Jan. 10.18, 13.2, 0.3' (N. Paul, Slooh, Canary Island (MPC - G40), 0.5-m Schmidt-Cassegrain)
2019 Jan. 07.79, 13.5, 0.8' (P. Camilleri, 0.406-m Newtonian reflector)
2019 Jan. 07.66, 14.0, 0.9' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 06.84, 13.6, 0.6' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Jan. 06.01, 13.5, 0.5' (A. Novichonok, 0.36-m Ritchey-Chretien; 14.0' tail in p.a. 294)
2019 Jan. 03.06, 13.6, 0.6' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Jan. 01.13, 13.1, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 30.71, 13.2, 2.5' (C. Wyatt, 0.25-m Newtonian reflector)

64P/Swift-Gehrels
Total-magnitude and coma-diameter estimates:
2019 Jan. 14.75, 9.1, 2' (U. Pilz, 0.105-m refractor)
2019 Jan. 14.02, 9.8, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 12.56, 9.9, 6' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 11.91, 10.1, 3' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain)
2019 Jan. 09.89, 9.8, 6' (T. Karhula, Virsbo, Sweden, 0.305-m Newtonian reflector)
2019 Jan. 09.85, 10.4, 2.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 07.98, 10.7, 2.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2019 Jan. 07.98, 10.0, 9.5' (D. Bamberger, 0.254-m Ritchey-Chretien)
2019 Jan. 07.86, 10.3, -- (G. van Buitenen, Nerpio, Spain (I89), 0.413-m Ritchey-Chretien)
2019 Jan. 07.50, 9.5, 4' (P. Camilleri, 20x80 binoculars)
2019 Jan. 06.82, 9.0, 8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 06.53, 9.6, 5' (P. Camilleri, 20x80 binoculars)
2019 Jan. 05.89, 10.9, 6.1' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 05.48, 9.6, 5' (P. Camilleri, 20x80 binoculars)
2019 Jan. 04.89, 9.3, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 04.79, 8.5, 15' (J. Navarro Pina, Puerto de la Cadena ( Murcia , Spain ), 20x80 binoculars)
2019 Jan. 03.98, 8.9, 3.6' (J. Bohusz, Myślin Poland, 0.25-m Newtonian reflector)
2019 Jan. 03.77, 8.7, 6' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Jan. 02.97, 8.9, 3.6' (S. Sementsov, 0.11-m Newtonian reflector)
2019 Jan. 02.86, 9.7, 3' (G. van Buitenen, Nerpio, Spain (I89), 0.43-m Ritchey-Chretien)
2019 Jan. 02.85, 9.7, 3.5' (W. Kutschera, 0.54-m Newtonian reflector)
2019 Jan. 02.85, 9.2, 6' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2019 Jan. 02.78, 8.1, 8' (U. Pilz, 16x70 binoculars)
2019 Jan. 02.76, 9.7, 6' (M. Meyer, 0.254-m Newtonian reflector)
2019 Jan. 02.76, 9.6, 6.5' (C. Harder, Jeersdorf, Germany f, 0.303-m Newtonian reflector)
2019 Jan. 01.87, 9.1, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 01.81, 9.0, 5' (J. Navarro Pina, Sierra de El Puerto de la Cadena ( Murcia , Spain ), 20x80 binoculars)
2019 Jan. 01.28, 9.3, 17.4' (R. Ramlow, 0.106-m refractor)
2019 Jan. 01.18, 8.9, 21' (T. Lehmann, 0.106-m refractor)
2018 Dec. 31.60, 10.2, 6' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Dec. 31.04, 9.5, 5' (M. Goiato, 0.22-m Newtonian reflector)
2018 Dec. 30.81, 8.6, 5' (J. Navarro Pina, Sierra de El Puerto de la Cadena ( Murcia , Spain ), 20x80 binoculars)
2018 Dec. 29.89, 9.5, 5' (C. Labordena, Culla, 0.15-m Newtonian reflector)
2018 Dec. 29.49, 10.4, 4' (K. Yoshimoto, 26x100 binoculars)
2018 Dec. 28.46, 9.2, 12' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 27.91, 10.7, 7.2' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 27.46, 9.2, 8.7' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 26.70, 9.1, 10' (P. Guzik, 10x50 binoculars)
2018 Dec. 25.85, 9.8, 4.5' (M. Meyer, 0.254-m Newtonian reflector)
2018 Dec. 25.85, 9.0, 5' (G. Scheerle, 9x63 binoculars)
2018 Dec. 25.12, 8.6, 30' (T. Lehmann, 0.106-m refractor)
2018 Dec. 24.76, 9.0, 7.5' (W. Kutschera, 0.25-m Newtonian reflector)
2018 Dec. 24.75, 10.1, 3.5' (M. Meyer, 0.254-m Newtonian reflector)

74P/Smirnova-Chernykh
Total-magnitude and coma-diameter estimates:
2019 Jan. 06.27, 16.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)

78P/Gehrels
Total-magnitude and coma-diameter estimates:
2019 Jan. 06.81, 11.7, 3' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2018 Dec. 28.85, 18.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)

123P/West-Hartley
Total-magnitude and coma-diameter estimates:
2019 Jan. 16.06, 12.8, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 14.66, 13.4, 1.1' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 14.06, 12.7, 1.1' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 12.61, 13.8, 0.9' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 09.08, 13.6, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 02.09, 14.1, 0.8' (K. Hills, 0.5-m Newtonian reflector)

131P/Mueller
Total-magnitude and coma-diameter estimates:
2018 Dec. 31.91, 19.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

137P/Shoemaker-Levy
Total-magnitude and coma-diameter estimates:
2018 Dec. 25.90, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

159P/LONEOS
Total-magnitude and coma-diameter estimates:
2018 Dec. 28.18, 16.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)

164P/Christensen
Total-magnitude and coma-diameter estimates:
2019 Jan. 15.08, 16.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 08.15, 16.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.12, 16.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)

171P/Spahr
Total-magnitude and coma-diameter estimates:
2019 Jan. 08.98, 14.8, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 27.93, 14.9, 0.8' (K. Hills, 0.5-m Newtonian reflector)

174P/Echeclus
Total-magnitude and coma-diameter estimates:
2019 Jan. 13.03, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 08.95, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 04.92, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.85, 18.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 24.86, 18.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

209P/LINEAR
Total-magnitude and coma-diameter estimates:
2019 Jan. 13.05, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 28.96, 19.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

232P/Hill
Total-magnitude and coma-diameter estimates:
2018 Dec. 28.95, 19.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

239P/LINEAR
Total-magnitude and coma-diameter estimates:
2019 Jan. 12.96, 17.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.06, 17.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

240P/NEAT
Total-magnitude and coma-diameter estimates:
2019 Jan. 12.17, 14.6, 0.8' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.09, 14.1, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 31.30, 14.8, 0.7' (K. Hills, 0.5-m Newtonian reflector)

247P/LINEAR
Total-magnitude and coma-diameter estimates:
2019 Jan. 08.13, 17.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.10, 17.7, 0.2' (K. Hills, 0.5-m Newtonian reflector)

361P/Spacewatch
Total-magnitude and coma-diameter estimates:
2018 Dec. 31.95, 16.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)

368P/NEAT
Total-magnitude and coma-diameter estimates:
2018 Dec. 25.87, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)

369P/Hill
Total-magnitude and coma-diameter estimates:
2018 Dec. 27.97, 16.1, 0.3' (K. Hills, 0.5-m Newtonian reflector)

370P/NEAT
Total-magnitude and coma-diameter estimates:
2019 Jan. 12.05, 19.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)

371P/LINEAR-Skiff
Total-magnitude and coma-diameter estimates:
2018 Dec. 28.89, 20.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

373P/Rinner
Total-magnitude and coma-diameter estimates:
2019 Jan. 01.87, 17.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)

374P/Larson
Total-magnitude and coma-diameter estimates:
2018 Dec. 28.91, 19.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2010 U3 (Boattini)
Total-magnitude and coma-diameter estimates:
2019 Jan. 06.04, 15.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 30.17, 14.7, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2011 KP36 (Spacewatch)
Total-magnitude and coma-diameter estimates:
2019 Jan. 04.99, 16.9, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 28.94, 17.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 09.03, 12.8, 1.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 02.07, 13.0, 1.6' (K. Hills, 0.5-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2018 Dec. 30.08, 16.3, 0.5' (M. Masek, 0.3-m Cassegrain reflector)

C/2016 A1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 05.94, 15.9, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 27.95, 15.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 16.63, 10.9, 2.4' (S. Rae, Karamu, New Zealand, 0.2-m Newtonian reflector)
2019 Jan. 14.68, 10.9, 4' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 12.58, 10.3, 4.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 30.46, 10.2, 12' (T. Lehmann, 0.106-m refractor; 0.21-deg tail in p.a. 326)
2018 Dec. 29.45, 10.6, 4' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 29.18, 10.6, 3.3' (M. Masek, 0.3-m Cassegrain reflector)
2018 Dec. 29.18, 10.8, 3.6' (M. Masek, 0.3-m Cassegrain reflector)
2018 Dec. 28.45, 10.4, 3.8' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 27.46, 10.8, 3.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 22.64, 10.2, 8.1' (T. Lehmann, 0.106-m refractor)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2019 Jan. 01.15, 16.7, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 14.65, 13.4, 0.7' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 12.57, 13.8, 1.1' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 07.77, 12.6, 1.5' (P. Camilleri, 0.406-m Newtonian reflector)
2019 Jan. 05.99, 11.9, 1.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.71, 12.7, 2.2' (R. Ramlow, 0.106-m refractor; 3.9' tail in p.a. 8)
2018 Dec. 31.64, 11.9, 1.5' (S. Yoshida, 0.4-m Newtonian reflector)
2018 Dec. 28.47, 13.0, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 27.47, 12.3, 1.3' (C. Wyatt, 0.25-m Newtonian reflector)

C/2016 R2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 14.19, 10.5, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 09.25, 13.9, 1.1' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 02.26, 10.7, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 02.21, 13.7, 1' (K. Hills, 0.5-m Newtonian reflector)

C/2016 X1 (Lemmon)
Total-magnitude and coma-diameter estimates:
2019 Jan. 01.02, 18.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 K4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2018 Dec. 26.84, 18.2, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 K6 (Jacques)
Total-magnitude and coma-diameter estimates:
2019 Jan. 10.00, 17.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.03, 18.3, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 M4 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 19.28, 14.3, 0.8' (M. Masek, 0.25-m Schmidt-Cassegrain)
2019 Jan. 19.27, 13.9, 0.8' (M. Masek, 0.25-m Schmidt-Cassegrain)

C/2017 T2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 09.92, 15.4, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 06.58, 15.4, 0.3' (A. Novichonok, 0.36-m Ritchey-Chretien; 0.2' tail in p.a. 172)
2019 Jan. 05.63, 15.5, 0.29' (A. Novichonok, 0.36-m Ritchey-Chretien; 0.2' tail in p.a. 156)
2019 Jan. 01.90, 15.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 01.19, 15.0, 0.19' (G. van Buitenen, Auberry, CA (U69), 0.61-m Ritchey-Chretien)
2018 Dec. 27.88, 15.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 27.51, 16.1, 0.8' (T. Lehmann, 0.31-m Newtonian reflector)

C/2018 A3 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 13.01, 15.5, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 06.05, 14.9, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 30.15, 15.4, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2018 A6 (Gibbs)
Total-magnitude and coma-diameter estimates:
2019 Jan. 02.18, 14.0, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2018 L2 (ATLAS)
Total-magnitude and coma-diameter estimates:
2019 Jan. 06.78, 9.4, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 01.77, 9.3, 6' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Dec. 29.77, 9.7, 4.5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)

C/2018 N2 (ASASSN)
Total-magnitude and coma-diameter estimates:
2019 Jan. 01.83, 12.9, 0.8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2018 Dec. 31.85, 13.9, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 29.12, 14.7, 0.6' (M. Masek, 0.3-m Cassegrain reflector)
2018 Dec. 29.11, 14.3, 0.6' (M. Masek, 0.3-m Cassegrain reflector)
2018 Dec. 28.46, 13.9, 1.5' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 27.45, 13.7, 1.1' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 24.84, 14.1, 0.8' (K. Hills, 0.5-m Newtonian reflector)

C/2018 V4 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Jan. 01.91, 20.1, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 W1 (Catalina)
Total-magnitude and coma-diameter estimates:
2018 Dec. 24.07, 18.9, 0.18' (K. Yoshimoto, 0.431-m Newtonian reflector)

C/2018 W2 (Africano)
Total-magnitude and coma-diameter estimates:
2019 Jan. 15.12, 17.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 08.17, 17.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 06.01, 17.5, -- (A. Novichonok, ISON-Kitab observatory, 0.36-m Ritchey-Chretien; 0.3' tail in p.a. 270)
2019 Jan. 01.16, 16.0, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2018 X2 (Fitzsimmons)
Total-magnitude and coma-diameter estimates:
2019 Jan. 02.85, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2018 Dec. 26.94, 18.0, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2018 Y1 (Iwamoto)
Total-magnitude and coma-diameter estimates:
2019 Jan. 19.24, 9.5, 4' (C. Labordena, Benlloch, 0.2-m Schmidt-Cassegrain)
2019 Jan. 18.22, 9.0, 5.5' (C. Harder, Jeersdorf, Germany f, 0.198-m Newtonian reflector)
2019 Jan. 16.62, 9.8, 4' (S. Rae, Karamu, New Zealand, 0.2-m Newtonian reflector)
2019 Jan. 15.70, 9.5, 5' (M. Mattiazzo, Swan Hill, Victoria, Australia, 25x40 binoculars)
2019 Jan. 15.24, 9.8, 4.51' (N. James, 0.09-m refractor)
2019 Jan. 14.68, 10.0, 6.4' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 14.26, 8.2, 10' (J. Gonzalez Suarez, 25x100 binoculars)
2019 Jan. 14.25, 8.7, 8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 12.62, 9.7, 5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 11.24, 11.4, 4.6' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 08.75, 9.9, 5' (P. Camilleri, 20x80 binoculars)
2019 Jan. 08.71, 10.7, 5' (N. James, 0.5-m Ritchey-Chretien)
2019 Jan. 07.80, 10.4, 3' (P. Camilleri, 0.406-m Newtonian reflector)
2019 Jan. 07.67, 10.2, 4.5' (C. Wyatt, 0.25-m Newtonian reflector)
2019 Jan. 07.26, 8.9, 8' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 06.83, 11.6, 2.4' (S. Yoshida, 0.4-m Newtonian reflector)
2019 Jan. 06.20, 11.2, 3.9' (K. Hills, 0.5-m Newtonian reflector)
2019 Jan. 04.31, 10.2, 7.8' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jan. 04.31, 11.9, 3' (M. Masek, 0.3-m Cassegrain reflector)
2019 Jan. 03.35, 11.5, -- (N. Paul, Slooh, La Dehesa (MPC - W88), 0.35-m Schmidt-Cassegrain)
2019 Jan. 03.23, 11.2, 1.2' (C. Labordena, Culla, 0.2-m Schmidt-Cassegrain)
2019 Jan. 02.25, 9.2, 5' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2019 Jan. 01.72, 10.9, 5' (R. Ramlow, 0.106-m refractor)
2019 Jan. 01.71, 11.5, 3.38' (N. James, 0.5-m Ritchey-Chretien)
2018 Dec. 30.69, 11.3, 1.4' (C. Wyatt, 0.25-m Newtonian reflector)
2018 Dec. 30.29, 10.9, 1.5' (M. Goiato, 0.22-m Newtonian reflector)
2018 Dec. 29.72, 10.6, 10' (T. Lehmann, 0.106-m refractor)
2018 Dec. 28.87, 11.6, 3.7' (K. Yoshimoto, 0.072-m reflector)
2018 Dec. 27.73, 10.6, 9.7' (T. Lehmann, 0.106-m refractor)
2018 Dec. 27.71, 12.2, 2' (N. James, 0.5-m Ritchey-Chretien)
2018 Dec. 25.71, 12.5, 1.69' (N. James, 0.5-m Ritchey-Chretien)
2018 Dec. 23.53, 10.7, 9.4' (T. Lehmann, 0.106-m refractor)
2018 Dec. 22.73, 11.2, 6' (T. Lehmann, 0.106-m refractor)
2018 Dec. 22.24, 12.5, 0.9' (K. Hills, 0.5-m Newtonian reflector)