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・ V40
・ V40 Mini-Grenade
・ V404 Cygni
・ V4046 Sagittarii
・ V4199 Sagittarii
・ V420 Aurigae
・ V424 Lacertae
・ V433 Aurigae
・ V4381 Sagittarii
・ V44 (vodka)
・ V445 Puppis
・ V446 Herculis
・ V448 Carinae
・ V45
・ V450 Aquilae
V4641 Sagittarii
・ V4650 Sagittarii
・ V473 Lyrae
・ V476 Cygni
・ V4998 Sagittarii
・ V5
・ V5 engine
・ V5 interface
・ V50
・ V500
・ V500 Aquilae
・ V509 Cassiopeiae
・ V518 Carinae
・ V520 Carinae
・ V529 Andromedae


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V4641 Sagittarii : ウィキペディア英語版
V4641 Sagittarii

V4641 Sagittarii (V4641 Sgr) is a variable X-ray binary star system in the constellation Sagittarius. It is the source of one of the fastest superluminal jets in our galaxy.
In 1999 a violent X-ray outburst revealed it to contain a black hole.〔(【引用サイトリンク】url=http://www.nrao.edu/pr/2000/v4641/ )〕 At the time, it was considered to be the closest known black hole to Earth, at a distance of approximately . Later observations showed it to be at least 15 times farther away.〔(A Black Hole in the Superluminal Source SAX J1819.3-2525 (V4641 SGR) ), 2001: "Finally, we find a distance in the range 7.40 ≤ d ≤ 12.31 kpc (90% confidence), which is at least a factor of ≈ 15 larger than the initially assumed distance of ≈ 1,600 light-years/500 pc."〕
==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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