8P＜タットル彗星＞
画面中央よりやや右よりの面積天体
8P＜タットル彗星＞部分
彗星を中心に640*480を切り抜く
2007/12/01T21:46:41〜22:03:12までの60〜240秒間露光10枚を合成
露光時間：60秒*7+120+180+240=16分00秒
ε160/530mm + LPS-P2 + 300D/ISO400 / EM200Temma2
StellaImage4でメトカーフ合成、レベル補正とリサイズ
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＊ 8P/タットル彗星！ ＊
P. F. A. Mechain (Paris, France) discovered this comet in the evening sky near Omicron Piscium on 1790 January 9.75. Several observers, including Charles Messier and William Herschel, observed the comet for the next three weeks. Ultimately, Mechain obtained the final observation on February 1. Mechain also computed an orbit, but because of the short duration of visibility the comet's short-period nature was not recognised. Horace Parnell Tuttle (Harvard College Observatory, Cambridge, Massachusetts) discovered this comet on 1858 January 5.01. He described it as "rather faint, but not so much so as to afford any difficulty in observing it with the great refractor." Karl Christian Bruhns (Berlin, Germany) independently discovered this comet on January 11.89. He described it as "a very large diffuse object without nucleus and distinct border." By that time, several observatories had already confirmed Tuttle's discovery, so Bruhns' name was not attached to this comet. |
2007年12月01日
