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・ IRCd
・ IRCF360
・ IRCHA
・ Irchel
・ Irchelpark
・ Irchenrieth
・ Irchester
・ Irchester Narrow Gauge Railway Museum
・ Irchester railway station
・ Irchester United F.C.
・ Irarutu language
・ Irará
・ IRAS
・ IRAS 12063-6259
・ IRAS 16293-2422
IRAS 17163-3907
・ IRAS 17423-1755
・ IRAS 18162−2048
・ IRAS 19475+3119
・ IRAS 23166+1655
・ IRAS 23304+6147
・ Irasalagundam
・ Irasburg, Vermont
・ Irase
・ Irasema Dilián
・ Irasto Knights
・ Irata
・ Irataba
・ Iratais Point
・ Iratapina River


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IRAS 17163-3907 : ウィキペディア英語版
IRAS 17163-3907


IRAS 17163-3907 is a possible yellow hypergiant star located 13,000 light years from Earth in the constellation of Scorpius. The star is embedded in thick shells of expelled gases and dust, and owing to its appearance has been nicknamed by astronomers the "Fried Egg Nebula". Yellow hypergiants are in an extremely active phase of their evolution.
==Discovery==
The star was discovered and catalogued as planetary nebula Hen 3-1379 in 1976, and classified as a proto-planetary nebular in 2003 after the 2.2 micron infrared sky survey. At the time of discovery, the star was thought to be much less massive and four times closer than it was discovered to be recently.

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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