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NGC 6984
NGC 6984 is a spiral galaxy located 180 million light years away in the constellation Indus.
It is known for having been the host of two recent supernovae: one in 2012 first known as SNhunt142〔http://www.astronomerstelegram.org/?read=4300〕 (later designated SN 2012im〔http://www.cbat.eps.harvard.edu/iau/cbet/003600/CBET003607.txt〕), and one in 2013 known as SN 2013ek. The first was a Type Ic〔http://www.astronomerstelegram.org/?read=5225〕 and the second was a Type Ib/c.〔http://www.astronomerstelegram.org/?read=5227〕 HST observations were initiated by Dr. Dan Milisavljevic.〔http://www.stsci.edu/cgi-bin/get-proposal-info?id=13505&observatory=HST〕
(NASA's press release ) about SN 2013ek said:
"It is so close to where SN 2012im was spotted that the two events are thought to be linked; the chance of two completely independent supernovae so close together and of the same class exploding within one year of one another is a very unlikely event. It was initially suggested that SN 2013ek may in fact be SN 2012im flaring up again, but further observations support the idea that they are separate supernovae — although they may be closely related in some as-yet-unknown way."
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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