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NGC 246
NGC 246, known as the Skull Nebula,〔"The Night Sky", ''Astronomy Now'', Oct 2008.〕 is a planetary nebula in the constellation Cetus. The nebula and the stars associated with it are listed in several catalogs, as summarized by the SIMBAD database.〔 It is roughly 1,600 light-years away.〔Stephen James O'Meara, ''The Caldwell Objects'', Sky Publishing Corporation, ISBN 0-933346-97-2, p 223.〕 The nebula's central star is the 12th magnitude〔 white dwarf HIP 3678. Among some amateur astronomers, NGC 246 is known as the "Pac-Man Nebula" because of the arrangement of its central stars and the surrounding star field.〔David H. Levy, ''Deep Sky Objects'', Prometheus Books, 2005, ISBN 1-59102-361-0, p 129.〕 ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「NGC 246」の詳細全文を読む
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