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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 31 Aquilae ： ウィキペディア英語版 31 Aquilae 31 Aquilae is the Flamsteed designation for a star in the equatorial constellation of Aquila. It has the Bayer designation b Aquilae. This star has an apparent visual magnitude of 5.16 and is 49.5 light years from Earth. It has no known companions. ==Properties== 31 Aquilae has an apparent visual magnitude of 5.16,〔 making it bright enough to be seen with the naked eye in dark skies. The annual parallax shift of 65.89 mas〔 yields a distance estimate of from Earth. It is a variable star with a magnitude change of less than 0.02.〔 With a stellar classification of G8 IV,〔 the luminosity class of IV indicates this is a subgiant star. Compared to the Sun, it has 116%〔 of the mass and 138%〔 of the radius. It is radiating nearly double〔 the luminosity of the Sun from its outer atmosphere at an effective temperature of 5,510 K,〔 giving it the yellow hue of an G-type star.〔 Its age is probably similar to NGC 188, the oldest open cluster known, which was calculated to be over 5 billion years. For its age, it is surprisingly rich in elements other than hydrogen or helium, contrary to common assumptions that the oldest stars should be metal-poor. No certain substellar companion has been detected so far around 31 Aquilae. McDonald Observatory team has set limits to the presence of one or more planets 〔Detection Limits from the McDonald Observatory Planet Search Program〕 around 31 Aquilae with masses between 0.22 and 1.9 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units. 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「31 Aquilae」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.