(5)Astraea＜小惑星5番アストラエア＞(2013)
2013/09/30T19:17:59〜19:29:03までの15秒間露光20枚を合成
露光時間：15秒*20=5分 ISO3200 長時間ノイズリダクションをオン
ε160/530mm + LPS-P2 + 60D / EM200Temma2
6.5で合成、レベル補正とリサイズ
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＊ 小惑星5番アストラエア ＊
Astraea was the fifth asteroid discovered, on December 8, 1845, by K. L. Hencke and named for Astraea, a goddess of justice named after the stars. It was his first of two asteroid discoveries. The second was 6 Hebe. An amateur astronomer and post office employee, Hencke was looking for 4 Vesta when he stumbled on Astraea. The King of Prussia awarded him an annual pension of 1,200 marks for the discovery.[7] Photometry indicates prograde rotation, that the north pole points in the direction of right ascension 9 h 52 min, declination 73° with a 5° uncertainty.[3] This gives an axial tilt of about 33°. |
2013年10月30日
