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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Alpha Coronae Australis ： ウィキペディア英語版 Alpha Coronae Australis Alpha Coronae Australis (α CrA, α Coronae Australis) is a star in the constellation Corona Australis. It is the only star in the constellation with a proper name, Alphekka Meridiana (Alphekka South), after the brightest star in Corona Borealis, Alphecca. In Chinese astronomy, it is known as 鱉六 (the Sixth Star of the River Turtle). It is a Class A star like Vega, rotating extremely fast on its axis, close to its breakup velocity. == Properties == Alpha Coronae Australis belongs to the spectral class A2Va and has apparent magnitude +4.10.〔 Located about 125 light years from Earth, the star's mass and radius are estimated at 2.3 times solar. With an effective temperature of roughly 9,100 K, the star radiates a total luminosity of about 31 times solar.〔 This star is roughly 254 million years old.〔 A rapidly rotating star, it spins at almost 200 km per second at the equator, making a complete revolution in approximately 14 hours.〔 Like the star Vega, it has excess infrared radiation, which indicates it may be ringed by a disk of dust.〔 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「Alpha Coronae Australis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.