Recent Comet Brightness Estimates

2P/Encke
Total-magnitude and coma-diameter estimates:
2017 May. 26.18, 14.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 05.80, 12.0, 7' (T. Lehmann, 0.4-m Newtonian reflector)
2017 Apr. 30.80, 12.8, 1' (P. Camilleri, 0.406-m Newtonian reflector)

29P/Schwassmann-Wachmann
Total-magnitude and coma-diameter estimates:
2017 May. 28.10, 12.9, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 27.20, 13.0, 2.6' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 26.17, 12.9, 2.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 22.22, 12.5, 1.8' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 08.15, 12.4, 1' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 07.15, 12.4, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 06.76, 13.5, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 06.16, 12.4, 1.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 05.16, 12.3, 1' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 04.76, 12.5, 1.2' (S. Yoshida, 0.4-m Newtonian reflector)
2017 May. 03.20, 12.0, 1.2' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 30.77, 13.0, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Apr. 29.15, 12.7, 0.7' (C. Harder, Namibia, 0.252-m Newtonian reflector)

41P/Tuttle-Giacobini-Kresak
Total-magnitude and coma-diameter estimates:
2017 May. 28.05, 8.4, 8.2' (W. Kutschera, 0.25-m Newtonian reflector)
2017 May. 27.97, 9.3, 9.3' (J. Cerny, 25x100 binoculars)
2017 May. 27.96, 9.5, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 27.96, 10.5, 1.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 May. 27.96, 10.7, 2.7' (C. Harder, Jeersdorf, Germany , 0.303-m Newtonian reflector)
2017 May. 26.94, 8.9, 8.8' (J. Cerny, 25x100 binoculars)
2017 May. 26.92, 9.4, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 26.88, 8.5, 4' (W. Hasubick, 10x50 binoculars)
2017 May. 26.15, 10.6, 2.6' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 25.96, 9.0, 10' (A. Scholten, Bussloo, 15x80 binoculars)
2017 May. 25.91, 9.4, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 24.80, 9.3, 5' (P. Camilleri, 20x80 binoculars)
2017 May. 24.09, 7.8, 9' (J. Gonzalez Suarez, 0.08-m refractor)
2017 May. 23.80, 9.0, 5' (P. Camilleri, 20x80 binoculars)
2017 May. 22.99, 8.2, 32' (T. Lehmann, 0.075-m reflector)
2017 May. 21.97, 8.9, 5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector)
2017 May. 21.94, 7.0, 8' (U. Pilz, 7x50 binoculars)
2017 May. 21.94, 9.5, 7' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 May. 20.99, 9.5, 5' (V. Kasten, 0.2-m Newtonian reflector)
2017 May. 20.09, 8.2, 7' (W. Kutschera, 0.25-m Newtonian reflector)
2017 May. 19.94, 8.9, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 19.89, 9.1, 6' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 May. 19.03, 9.9, 3.8' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 18.96, 8.5, 10' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars)
2017 May. 18.95, 8.6, 15' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 May. 18.93, 8.9, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 18.91, 8.7, 8' (M. Biely, Czech Republic, Brno, 20x80 binoculars)
2017 May. 18.28, 8.1, 32' (T. Lehmann, 0.106-m refractor)
2017 May. 17.95, 8.1, 26' (T. Lehmann, 0.075-m reflector)
2017 May. 17.93, 9.0, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 16.92, 9.1, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 14.94, 10.9, 1.5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 40x100 binoculars)
2017 May. 14.92, 8.1, 10' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 May. 14.90, 9.2, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 14.10, 9.6, 3.7' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 11.06, 7.7, 33' (T. Lehmann, 0.075-m reflector)
2017 May. 06.73, 8.8, 9.5' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 06.21, 7.2, 13' (C. Labordena, La Serra, 11x80 binoculars)
2017 May. 05.96, 8.5, 10' (T. Karhula, Virsbo, Sweden, 25x100 binoculars)
2017 May. 05.47, 7.4, 20' (C. Hergenrother, 10x50 binoculars)
2017 May. 05.43, 7.3, 58' (T. Lehmann, 0.106-m refractor; 0.08-deg tail in p.a. 246)
2017 May. 05.05, 9.1, 3.3' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 May. 04.98, 8.9, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 04.73, 10.6, 5.5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 May. 03.38, 7.4, 14' (C. Hergenrother, 10x50 binoculars)
2017 May. 03.17, 8.3, 8' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 03.07, 7.0, 15' (J. Gonzalez Suarez, 0.045-m refractor)
2017 May. 03.02, 8.4, 9' (M. Lehký, 10x80 binoculars)
2017 May. 02.44, 7.3, 50' (T. Lehmann, 0.106-m refractor; 0.12-deg tail in p.a. 245)
2017 May. 02.01, 8.4, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 01.97, 10.1, 4.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 May. 01.04, 8.2, 6' (C. Harder, Namibia, 0.252-m Newtonian reflector)
2017 May. 01.02, 7.3, 37' (T. Lehmann, 0.075-m reflector; 0.06-deg tail in p.a. 238)
2017 May. 01.01, 7.5, 15' (M. Buechner, Freising, Germany, 8x42 binoculars)
2017 May. 01.00, 7.6, 15' (P. Guzik, Niżna Łąka, 10x50 binoculars)
2017 Apr. 30.96, 7.8, 12' (J. Cerny, 8x40 binoculars)
2017 Apr. 30.95, 8.3, 10' (M. Lehký, 10x80 binoculars)
2017 Apr. 30.95, 7.8, 10.2' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector)
2017 Apr. 30.93, 8.3, 6' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 30.27, 7.6, 12' (M. Goiato, 20x100 binoculars)
2017 Apr. 30.06, 7.9, 14' (C. Harder, Namibia, 0.252-m Newtonian reflector)
2017 Apr. 30.01, 8.0, 12' (W. Kutschera, 0.25-m Newtonian reflector)
2017 Apr. 29.98, 7.2, 40' (G. Scheerle, 9x63 binoculars)
2017 Apr. 29.97, 7.6, 22' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Apr. 29.97, 8.4, 12' (V. Kasten, 15x50 binoculars)
2017 Apr. 29.89, 7.9, 16' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Apr. 29.85, 7.4, 20' (U. Pilz, 7x50 binoculars)
2017 Apr. 29.03, 8.1, 8.5' (C. Harder, Namibia, 0.252-m Newtonian reflector)

43P/Wolf-Harrington
Total-magnitude and coma-diameter estimates:
2017 May. 02.55, 16.7, 0.6' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 May. 01.00, 14.4, 0.3' (K. Hills, 0.5-m Newtonian reflector)

65P/Gunn
Total-magnitude and coma-diameter estimates:
2017 May. 28.09, 13.8, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 28.05, 12.8, 0.9' (W. Kutschera, 0.54-m Newtonian reflector)
2017 May. 27.51, 13.5, 0.8' (P. Camilleri, 0.406-m Newtonian reflector)
2017 May. 26.50, 13.7, 0.9' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 18.04, 13.2, 0.7' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 03.22, 14.1, 0.4' (K. Hills, 0.5-m Newtonian reflector)

71P/Clark
Total-magnitude and coma-diameter estimates:
2017 May. 28.16, 10.9, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 28.08, 13.4, 0.7' (W. Kutschera, 0.54-m Newtonian reflector)
2017 May. 27.95, 10.2, 2' (C. Harder, Jeersdorf, Germany , 0.303-m Newtonian reflector)
2017 May. 27.50, 11.0, 1' (P. Camilleri, 0.406-m Newtonian reflector)
2017 May. 27.17, 11.0, 1.5' (M. Goiato, 0.22-m Newtonian reflector)
2017 May. 26.64, 10.9, 1.2' (N. Paul, Siding Spring - Australia - MPC Q62, 0.431-m Cassegrain reflector)
2017 May. 26.51, 11.1, 1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 25.96, 11.8, 1.5' (U. Pilz, 0.32-m Newtonian reflector)
2017 May. 25.12, 11.6, 1.5' (M. Goiato, 0.22-m Newtonian reflector)
2017 May. 24.43, 12.5, 0.8' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 24.02, 11.2, 2.2' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain)
2017 May. 22.59, 10.7, 10' (T. Lehmann, 0.4-m Newtonian reflector; 0.23-deg tail in p.a. 288)
2017 May. 20.03, 13.2, 0.8' (W. Kutschera, 0.54-m Newtonian reflector)
2017 May. 19.04, 11.0, 1.9' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 17.99, 12.0, 0.7' (W. Hasubick, 0.44-m Newtonian reflector)
2017 May. 17.27, 10.8, 11' (T. Lehmann, 0.106-m refractor; 0.13-deg tail in p.a. 294)
2017 May. 07.55, 12.8, 1.3' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector; 3.0' tail in p.a. 285)
2017 May. 06.79, 11.4, 9' (T. Lehmann, 0.4-m Newtonian reflector; 0.22-deg tail in p.a. 281)
2017 May. 06.75, 12.4, 1.1' (C. Wyatt, 0.25-m Newtonian reflector)
2017 May. 06.29, 12.0, 1.5' (M. Goiato, 0.22-m Newtonian reflector)
2017 May. 04.74, 12.2, 1.2' (S. Yoshida, 0.4-m Newtonian reflector)
2017 May. 02.43, 11.9, 6' (T. Lehmann, 0.106-m refractor; 0.07-deg tail in p.a. 290)
2017 May. 01.09, 11.7, 0.9' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 01.00, 12.3, 1.6' (J. Cerny, 0.355-m Newtonian reflector)
2017 Apr. 30.75, 12.6, 0.7' (P. Camilleri, 0.406-m Newtonian reflector)
2017 Apr. 29.78, 13.2, 0.7' (A. Pearce, Nedlands, 0.41-m Newtonian reflector)

94P/Russell
Total-magnitude and coma-diameter estimates:
2017 May. 28.07, 17.6, 0.2' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 15.58, 17.5, 0.4' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)
2017 May. 01.07, 16.8, 0.2' (K. Hills, 0.5-m Newtonian reflector)

95P/Chiron
Total-magnitude and coma-diameter estimates:
2017 May. 26.20, 17.9, 0.2' (K. Hills, 0.5-m Newtonian reflector)

144P/Kushida
Total-magnitude and coma-diameter estimates:
2017 May. 01.01, 15.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

157P/Tritton
Total-magnitude and coma-diameter estimates:
2017 May. 02.64, 17.3, 0.4' (R. Dymock, Warrumbungle, New South Wales, Australia, 0.51-m Cassegrain reflector)

187P/LINEAR
Total-magnitude and coma-diameter estimates:
2017 May. 27.94, 20.4, 0.2' (K. Hills, 0.5-m Newtonian reflector)

213P/Van Ness
Total-magnitude and coma-diameter estimates:
2017 May. 28.13, 14.9, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 21.18, 15.3, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 05.78, 17.3, 0.4' (T. Lehmann, 0.4-m Newtonian reflector; 0.01-deg tail in p.a. 258)
2017 Apr. 30.79, 17.4, 0.4' (T. Lehmann, 0.4-m Newtonian reflector; 0.01-deg tail in p.a. 263)

315P/LONEOS
Total-magnitude and coma-diameter estimates:
2017 May. 28.06, 14.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 26.96, 14.0, 1.7' (J. Cerny, 0.355-m Newtonian reflector)
2017 May. 01.13, 14.4, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2013 X1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 Apr. 30.99, 15.5, 0.5' (K. Hills, 0.5-m Newtonian reflector)

C/2014 W2 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 28.17, 14.9, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 19.05, 14.2, 0.7' (K. Hills, 0.5-m Newtonian reflector)

C/2015 ER61 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 28.78, 8.1, 6.3' (C. Wyatt, 7x50 binoculars)
2017 May. 26.18, 9.1, 2.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 24.81, 7.8, 4' (P. Camilleri, 20x80 binoculars)
2017 May. 24.12, 7.9, 4' (J. Gonzalez Suarez, 25x100 binoculars)
2017 May. 23.81, 7.7, 5' (P. Camilleri, 20x80 binoculars)
2017 May. 14.05, 7.9, 3.2' (M. Paradowski, Lublin, Poland, 0.034-m reflector; 0.22-deg tail)
2017 May. 13.45, 8.1, 15' (T. Lehmann, 0.106-m refractor; 1.6-deg tail in p.a. 250)
2017 May. 13.19, 7.7, 3.1' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 08.30, 7.7, 5' (W. Souza, 15x70 binoculars)
2017 May. 07.35, 7.6, 6' (M. Goiato, 20x100 binoculars)
2017 May. 07.20, 7.3, 4.9' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 06.77, 7.8, 8.5' (C. Wyatt, 7x50 binoculars)
2017 May. 06.45, 8.0, 15' (T. Lehmann, 0.106-m refractor; 1.7-deg tail in p.a. 249)
2017 May. 06.21, 7.9, 4' (C. Labordena, La Serra, 11x80 binoculars)
2017 May. 05.46, 7.7, 5' (C. Hergenrother, 10x50 binoculars)
2017 May. 04.75, 7.8, 5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 May. 03.46, 7.9, 18' (T. Lehmann, 0.106-m refractor; 1.1-deg tail in p.a. 249)
2017 May. 03.21, 7.9, 5.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 03.15, 7.5, 5' (J. Gonzalez Suarez, 25x100 binoculars)
2017 May. 01.78, 7.8, 5' (P. Camilleri, 20x80 binoculars)
2017 May. 01.47, 7.9, 5' (C. Hergenrother, 10x50 binoculars)
2017 May. 01.46, 7.8, 18' (T. Lehmann, 0.106-m refractor; 2.0-deg tail in p.a. 250)
2017 May. 01.40, 8.1, 5.4' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 May. 01.40, 8.7, 3.9' (M. Masek, 0.3-m Schmidt-Cassegrain)
2017 May. 01.35, 7.6, 5' (L. Camargo da Silva, 0.13-m Newtonian reflector)
2017 Apr. 30.79, 7.5, 6' (P. Camilleri, 20x80 binoculars)
2017 Apr. 30.31, 7.4, 6' (M. Goiato, 20x100 binoculars)
2017 Apr. 30.14, 7.2, 4.8' (C. Harder, Namibia, 0.252-m Newtonian reflector; 25.0' tail)
2017 Apr. 29.77, 7.5, 5' (P. Camilleri, 20x80 binoculars)
2017 Apr. 29.14, 7.3, 3.3' (C. Harder, Namibia, 0.252-m Newtonian reflector; 17.0' tail)

C/2015 O1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 28.18, 14.1, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 06.03, 14.5, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2015 V2 (Johnson)
Total-magnitude and coma-diameter estimates:
2017 May. 28.97, 7.3, 25' (A. Baransky, Bucha, Ukraine, 10x50 binoculars)
2017 May. 28.45, 7.4, 17' (C. Wyatt, 7x50 binoculars)
2017 May. 27.99, 8.0, 7.8' (W. Kutschera, 0.25-m Newtonian reflector; 0.3-deg tail)
2017 May. 27.98, 7.5, 12' (A. Scholten, Bussloo, 15x80 binoculars)
2017 May. 27.97, 7.3, 14' (A. Baransky, Bucha, Ukraine, 10x50 binoculars)
2017 May. 27.97, 8.0, 6' (C. Harder, Jeersdorf, Germany , 0.303-m Newtonian reflector; 14.0' tail in p.a. 330)
2017 May. 27.97, 8.0, 6' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars; 6.0' tail in p.a. 320)
2017 May. 27.95, 7.9, 9' (V. Kasten, 15x50 binoculars)
2017 May. 27.94, 8.2, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 27.92, 8.2, 14.1' (J. Cerny, 25x100 binoculars; 0.9-deg tail in p.a. 320)
2017 May. 27.88, 8.2, 4' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 May. 27.53, 7.5, 15' (P. Camilleri, 0.08-m refractor)
2017 May. 27.42, 7.5, 15' (C. Wyatt, 7x50 binoculars)
2017 May. 27.15, 8.0, 4.5' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 27.13, 7.8, 6' (M. Goiato, 20x100 binoculars)
2017 May. 27.02, 7.9, 9' (V. Kasten, 15x50 binoculars)
2017 May. 26.95, 7.5, 15' (A. Scholten, Bussloo, 15x80 binoculars; 0.5-deg tail in p.a. 325)
2017 May. 26.95, 8.1, 4' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars)
2017 May. 26.94, 8.3, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars; 7.0' tail in p.a. 320)
2017 May. 26.92, 8.1, 10.2' (J. Cerny, 25x100 binoculars; 0.9-deg tail in p.a. 320)
2017 May. 26.91, 8.3, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 26.88, 7.4, 11.8' (W. Hasubick, 10x50 binoculars)
2017 May. 26.48, 7.6, 12.1' (C. Wyatt, 7x50 binoculars)
2017 May. 26.41, 8.0, 7' (M. Linnolt, Volcano, Hawaii, 0.416-m Newtonian reflector; 30.0' tail in p.a. 300)
2017 May. 26.12, 8.0, 8.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 26.00, 8.1, 8' (G. van Buitenen, Dordrecht, NL, 0.305-m Newtonian reflector)
2017 May. 25.95, 7.3, 18' (A. Scholten, Eerbeek, 8x56 binoculars)
2017 May. 25.92, 8.0, 9' (V. Kasten, 15x50 binoculars)
2017 May. 25.90, 8.3, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 25.14, 8.0, 3.8' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 24.93, 8.0, 12' (A. Scholten, Eerbeek, 8x56 binoculars)
2017 May. 24.50, 8.0, 7' (P. Camilleri, 20x80 binoculars)
2017 May. 24.42, 7.8, 12' (C. Wyatt, 7x50 binoculars)
2017 May. 24.41, 8.3, 4.3' (C. Wyatt, 0.25-m Newtonian reflector; 10.0' tail in p.a. 337)
2017 May. 24.31, 8.3, 10.5' (N. Paul, Mayhill, New Mexico - MPC H06, 0.106-m Cassegrain reflector)
2017 May. 24.15, 8.1, 4.1' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 24.01, 7.1, 15' (J. Gonzalez Suarez, 0.045-m refractor; 0.5-deg tail in p.a. 320)
2017 May. 23.45, 8.0, 8' (P. Camilleri, 20x80 binoculars)
2017 May. 22.96, 8.4, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 22.91, 7.5, 32' (T. Lehmann, 0.075-m reflector; 0.7-deg tail in p.a. 319)
2017 May. 21.97, 8.0, 7' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars; 15.0' tail in p.a. 305)
2017 May. 21.96, 7.9, 6' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector; 7.0' tail in p.a. 320)
2017 May. 21.95, 7.8, 6' (U. Pilz, 7x50 binoculars)
2017 May. 21.49, 8.2, 7' (P. Camilleri, 20x80 binoculars)
2017 May. 21.41, 7.3, 40' (T. Lehmann, 0.106-m refractor; 0.8-deg tail in p.a. 319)
2017 May. 21.16, 7.8, 10.7' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 21.15, 8.4, 3.4' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 21.00, 7.9, 12' (A. Scholten, Eerbeek, 8x56 binoculars)
2017 May. 20.99, 7.8, 8.4' (W. Kutschera, 0.25-m Newtonian reflector; 0.36-deg tail)
2017 May. 20.94, 7.9, 11' (V. Kasten, 15x50 binoculars)
2017 May. 20.90, 7.3, 18' (M. Paradowski, Dąbrowa, Poland, 7x35 binoculars)
2017 May. 20.14, 8.5, 3.4' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 19.93, 8.5, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 19.88, 8.4, 6.5' (M. Biely, Czech Republic, Brno, 20x80 binoculars; 0.2-deg tail in p.a. 315)
2017 May. 19.88, 8.5, 8' (G. van Buitenen, Verfeuil, France, 0.13-m Newtonian reflector; 17.0' tail in p.a. 315)
2017 May. 19.83, 8.5, 8' (A. Tsvetkov, Zavolzhye, 0.05-m reflector)
2017 May. 18.94, 8.3, 8' (M. Jarmoc, Ignatki, 26x70 binoculars)
2017 May. 18.94, 7.8, 6' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 11x80 binoculars; 15.0' tail in p.a. 320)
2017 May. 18.91, 8.3, 7' (M. Biely, Czech Republic, Brno, 20x80 binoculars; 0.3-deg tail in p.a. 320)
2017 May. 18.91, 8.5, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 18.88, 8.1, 5' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 May. 18.15, 8.6, 3.4' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 17.98, 8.4, 4.5' (C. Harder, Jeersdorf, Germany , 0.252-m Newtonian reflector; 7.0' tail in p.a. 310)
2017 May. 17.95, 8.0, 11' (V. Kasten, 15x50 binoculars)
2017 May. 17.92, 7.6, 31' (T. Lehmann, 0.075-m reflector; 0.5-deg tail in p.a. 313)
2017 May. 17.91, 8.3, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 17.87, 7.4, 9.6' (W. Hasubick, 10x50 binoculars)
2017 May. 17.85, 8.3, 6' (M. Jarmoc, Bialystok, 26x70 binoculars)
2017 May. 17.16, 8.5, 3.2' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 17.14, 8.1, 8.4' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 16.95, 7.9, 16' (M. Paradowski, Lublin, Poland, 0.034-m reflector)
2017 May. 16.93, 8.4, 5' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 16.92, 8.5, 7' (G. van Buitenen, Verfeuil, France, 0.13-m Newtonian reflector; 15.0' tail in p.a. 315)
2017 May. 16.14, 8.5, 3.4' (S. Aguirre, Sonora, Mexico., 0.2-m Schmidt-Cassegrain)
2017 May. 15.86, 7.4, 13.1' (W. Hasubick, 10x50 binoculars)
2017 May. 14.95, 7.4, -- (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 7x50 binoculars)
2017 May. 14.94, 7.6, 5' (J. Warell, Lindby Observatory (K60), Skurup, Sweden , 20x100 binoculars)
2017 May. 14.93, 9.6, 3.8' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 May. 14.91, 7.7, 15' (A. Scholten, Eerbeek, 8x56 binoculars)
2017 May. 14.91, 8.5, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 14.85, 8.5, 9' (A. Tsvetkov, Zavolzhye, 0.05-m reflector)
2017 May. 14.14, 8.5, 3' (S. Aguirre, Sonora, Mexico, 0.2-m Schmidt-Cassegrain)
2017 May. 13.87, 8.9, 3' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 May. 13.13, 8.4, 7.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 12.92, 8.2, 4.5' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 May. 10.38, 7.8, 25' (T. Lehmann, 0.106-m refractor; 0.45-deg tail in p.a. 309)
2017 May. 08.90, 8.7, 4.5' (G. van Buitenen, Dordrecht, NL, 64x305 binoculars)
2017 May. 08.88, 8.5, 7.1' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 06.72, 8.4, 4.6' (C. Wyatt, 0.25-m Newtonian reflector; 15.0' tail in p.a. 297)
2017 May. 06.20, 8.9, 6' (C. Labordena, La Serra, 0.2-m Schmidt-Cassegrain; 12.0-deg tail)
2017 May. 05.96, 8.5, 5' (T. Karhula, Virsbo, Sweden, 25x100 binoculars)
2017 May. 05.47, 8.5, 5' (C. Hergenrother, 30x125 binoculars)
2017 May. 05.47, 7.8, 8' (C. Hergenrother, 10x50 binoculars)
2017 May. 05.42, 7.9, 35' (T. Lehmann, 0.106-m refractor; 0.6-deg tail in p.a. 309)
2017 May. 05.03, 8.4, 5.2' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 6.2' tail in p.a. 305)
2017 May. 04.99, 8.7, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 04.90, 8.8, 6.6' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 04.76, 8.1, 6.5' (S. Yoshida, 0.07-m refractor)
2017 May. 04.72, 8.6, 7.5' (S. Yoshida, 0.4-m Newtonian reflector)
2017 May. 03.38, 7.8, 10' (C. Hergenrother, 10x50 binoculars)
2017 May. 03.12, 8.8, 7' (J. Gonzalez Suarez, 0.203-m Schmidt-Cassegrain; 0.2-deg tail in p.a. 300)
2017 May. 02.89, 8.0, 7' (M. Lehký, 25x100 binoculars)
2017 May. 02.81, 8.8, 2.83' (P. Jordanov, Dimitrovgrad-Brod, Bulgaria, 0.15-m Newtonian reflector)
2017 May. 02.02, 8.5, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 May. 01.96, 8.8, 5.1' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain; 7.0' tail in p.a. 285)
2017 May. 01.90, 9.3, 2' (M. Legutko, Gliwice, 0.2-m Newtonian reflector)
2017 May. 01.48, 7.9, 10' (C. Hergenrother, 10x50 binoculars)
2017 May. 01.03, 8.7, 5' (C. Harder, Namibia, 0.252-m Newtonian reflector; 10.0' tail in p.a. 320)
2017 May. 01.01, 8.2, 10' (P. Guzik, Niżna Łąka, 10x50 binoculars)
2017 May. 01.01, 8.6, 8' (M. Buechner, Freising, Germany, 8x42 binoculars)
2017 Apr. 30.98, 8.5, 10' (J. Cerny, 8x40 binoculars)
2017 Apr. 30.98, 8.1, 8.8' (K. Hills, 0.5-m Newtonian reflector)
2017 Apr. 30.94, 8.1, 26' (T. Lehmann, 0.075-m reflector; 0.49-deg tail in p.a. 308)
2017 Apr. 30.94, 8.6, 4' (M. Kwinta, Krakow, 0.185-m Newtonian reflector)
2017 Apr. 30.90, 8.2, 7' (M. Lehký, 25x100 binoculars)
2017 Apr. 30.89, 8.9, 7' (J. Bohusz, Myślin Poland, 0.38-m Newtonian reflector; 0.18-deg tail in p.a. 280)
2017 Apr. 30.25, 8.8, 5' (M. Goiato, 20x100 binoculars)
2017 Apr. 30.06, 8.2, 4.4' (W. Kutschera, 0.25-m Newtonian reflector; 0.28-deg tail)
2017 Apr. 30.05, 8.6, 5' (C. Harder, Namibia, 0.252-m Newtonian reflector; 10.0' tail in p.a. 305)
2017 Apr. 29.99, 8.4, 3.3' (V. Kasten, 0.114-m Newtonian reflector)
2017 Apr. 29.98, 7.6, 11' (G. Scheerle, 9x63 binoculars)
2017 Apr. 29.95, 7.8, 11' (G. Scheerle, 0.235-m Schmidt-Cassegrain)
2017 Apr. 29.95, 8.5, 7.4' (V. Kasten, 15x50 binoculars)
2017 Apr. 29.93, 9.6, 5.7' (M. Collins, Everton, 0.254-m Schmidt-Cassegrain)
2017 Apr. 29.89, 7.9, 13' (A. Scholten, Eerbeek, 15x80 binoculars)
2017 Apr. 29.86, 8.4, 8' (U. Pilz, 7x50 binoculars)
2017 Apr. 29.85, 8.4, 6.5' (M. Meyer, 20x88 binoculars)
2017 Apr. 29.02, 8.8, 6' (C. Harder, Namibia, 0.252-m Newtonian reflector)

C/2016 M1 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 18.40, 16.1, 0.7' (T. Lehmann, 0.51-m Newtonian reflector)
2017 May. 18.15, 14.8, 0.6' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 06.04, 15.7, 0.3' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N4 (MASTER)
Total-magnitude and coma-diameter estimates:
2017 May. 28.21, 13.3, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 05.21, 15.0, 0.4' (K. Hills, 0.5-m Newtonian reflector)

C/2016 N6 (PANSTARRS)
Total-magnitude and coma-diameter estimates:
2017 May. 28.19, 16.3, 0.3' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 18.13, 15.5, 0.5' (K. Hills, 0.5-m Newtonian reflector)
2017 May. 03.95, 16.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 B3 (LINEAR)
Total-magnitude and coma-diameter estimates:
2017 Apr. 30.97, 16.5, 0.2' (K. Hills, 0.5-m Newtonian reflector)

C/2017 D2 (Barros)
Total-magnitude and coma-diameter estimates:
2017 May. 28.76, 16.3, -- (G. van Buitenen, Siding Spring, MPC Q62, 0.43-m Schmidt-Cassegrain)

C/2017 E1 (Borisov)
Total-magnitude and coma-diameter estimates:
2017 Apr. 30.35, 10.9, 2' (M. Goiato, 0.22-m Newtonian reflector)