C/2011 R1 ＜マクノート 彗星＞
2012/05/12T22:20:14.99〜22:37:34.00までの60秒間露光20枚を合成
露光時間：60秒*20=20分
ε160/530mm + LPS-P2 + 60D/ISO800 / EM200Temma2
StellaImage4で合成、レベル補正とリサイズ
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2011 R1 (McNaught)
Rob McNaught discovered a 17th magnitude comet on CCD images taken with the 0.5-m Uppsala Schmidt telescope at Siding Spring on September 3.72. The comet reached perihelion at 2.1 AU in 2012 October, when it was around 11th magnitude. It will begin to fade in April.
18 observations received so far suggest a preliminary light curve of
m = 6.2 + 5 log d + 9.9 log r
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2013年05月12日
