ISON 官网的新消息 9月12号
http://www.isoncampaign.org/potw-sep09大意是亮度仍然不能确定,但是估计在-3到-5等。
难道要失望了啊! 这也不错了
最近应该已经接近11等了。这时候说彗星最后亮度为时过早。 现在观测数据还是很少,具体亮度不是很清楚。 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。 这都能找到。 近几天照相观测的图片下面标注的星等在12~12.2等之间。
总归感觉还是不太妙啊。 a little bit disappointed... 有这么亮也就很不错啦,当年错过海尔-波普,非常遗憾
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