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R Coronae Australis : ウィキペディア英語版 | R Coronae Australis R Coronae Australis (R CrA) is a variable star in the constellation Corona Australis.〔 It has varied between magnitudes 10 and 14.36.〔 A small reflection/emission nebula NGC 6729 extends from star towards SE. This star is moving toward the Solar System with a radial velocity of . In roughly 222,000 years, this system may approach within of the Sun. However, this estimate has a considerable margin of error, so the actual distance remains uncertain.〔 ==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「R Coronae Australis」の詳細全文を読む
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