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SN 1990U
SN 1990U was a type Ic supernova event in the nucleus of the SB galaxy NGC 7479. It was discovered July 27, 1990 by the Berkeley Automated Supernova Search after reaching magnitude .〔 Initially this was classified as a Type Ib supernova, but the weakness of the neutral helium absorption lines led to a reclassification.〔 ==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「SN 1990U」の詳細全文を読む
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