原文如下:Now it is 11.1 mag (Sept. 16, Tsutomu Seki). It is expected to be a great comet in 2013 autumn when the comet approaches to the sun down to only 0.01 A.U. It keeps visible with naked eyes from November to January, and can be extremely bright as Venus or more at the highlight. But recently, it is fainter than originally expected by 2 mag. It may be 3 mag at best actually when it is observable in the morning sky. The condition is excellent in the Northern Hemisphere. It keeps observable almost all through the period of brightening, at the highlight, and of fading. The condition is not good in the Southern Hemisphere. It is not observable at all the latter part of the highlight, and it keeps low all through the period.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Sept.21 9 14.88 19 26.7 2.439 1.835 42 11.9 4:22 (263, 24)
Sept.28 9 28.36 18 13.1 2.238 1.707 46 11.5 4:28 (266, 28)
最近9月16日有报告称11.1等。目前的预报仍然是比最初约暗2个星等。 |