COMET 17P/Holmes
Total-magnitude and coma-diameter estimates (visual unless otherwise noted):
2007
Oct. 31.88, 2.4, -- (A. Pereira, Cabo da Roca, Portugal, naked eye);
31.82, 2.0, 15' (T. Scarmato, Calabria, Italy, naked eye);
31.79, 2.5, 10' (K. Hornoch, Vohancice, Czech Republic, naked eye);
31.76, 2.5, -- (K. Cernis, Vilnius, Lithuania, naked eye);
31.75, 2.4, 11' (S. Baroni, Milan, Italy, 7x50 binoculars);
31.74, 2.6, -- (S. Foglia, Novara, Italy, naked eye);
31.47, 2.7, -- (S. Yoshida, Kanagawa, Japan, naked eye);
31.22, 2.5, -- (D. W. E. Green, Lexington, MA, U.S.A., naked eye);
31.14, 2.5, 9' (C. E. Spratt, Victoria, BC, 7x50 binoculars);
31.07, 2.3, 21' (B. H. Granslo, Fjellhamar, Norway, naked eye);
31.00, 2.4, -- (M. Meyer, Limburg, Germany, naked eye);
30.90, 2.2, -- (O. Skilbrei, Honefoss, Norway, naked eye);
30.86, 1.8, 15' (T. Scarmato, Calabria, Italy, naked eye);
30.78, 2.3, 12' (A. Diepvens, Balen, Belgium, 20x50 binoculars);
30.64, 2.6, 11' (A. Novichonok, Kondopoga, Russia, 7x50 binoculars);
30.45, 2.6, -- (R. O. Wheeler, Edmond, OK, U.S.A., naked eye);
30.45, 2.6, -- (S. Yoshida, Kanagawa, Japan, naked eye);
30.32, 2.5, -- (M. Linnolt, Honolulu, HI, U.S.A., naked eye);
30.20, 2.4, -- (D. W. E. Green, Lexington, MA, U.S.A., naked eye);
30.16, 2.5, 7' (C. E. Spratt, Victoria, BC, Canada, 7x50 binoculars);
30.05, 2.6, 8' (P. Creed, New Alexander, OH, U.S.A., naked eye);
30.04, 2.5, -- (A. Pereira, Carnaxide, Portugal, naked eye);
29.99, 2.4, & 10' (B. H. Granslo, Blindern, Oslo, Norway, naked eye; clearly non-stellar);
29.91, 2.2, -- (O. Skilbrei, Honefoss, Norway, naked eye);
29.90, 2.4, & 10' (M. L. Paradowski, Lublin, Poland, naked eye; moonlight and city lights);
29.87, 2.7, -- (J. Carvajal, Madrid, Spain, naked eye);
29.76, 2.2, 14' (T. Scarmato, Calabria, Italy, naked eye);
29.76, 2.2, 10' (Y. Nagai, Gunma, Japan, naked eye);
29.54, 2.3, -- (S. Yoshida, Ibaraki, Japan, naked eye);
29.21, 2.7, -- (C. W. Hergenrother, Tucson, AZ, U.S.A., naked eye; non-stellar appearance);
29.20, 2.4, -- (D. W. E. Green, Lexington, MA, U.S.A., naked eye);
29.18, 3.0, -- (R. O. Wheeler, Edmond, OK, U.S.A., naked eye);
29.12, 2.5, -- (J. Rao, Putnam Valley, NY, U.S.A., naked eye); |