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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 Crateris ： ウィキペディア英語版 31 Crateris 31 Crateris is a binary star system in the constellation Corvus. Varying between apparent magnitudes 5.19 and 5.23 over 1.48 days, it has the variable star designation of TY Corvi. It is actually a remote system with a hot blue-white star of spectral type B1.5V and a companion about which little is known. The two stars orbit each other every 2.9631 days. The primary is possibly a blue straggler of the Hyades group. The primary is around 15.5 times as massive as the Sun and 52262 times as luminous.〔 British astronomer John Flamsteed numbered the stars in an expanded constellation he termed ''Hydra and Crater'', which included the stars of Hydra immediately below the Cup. Published in 1712, this was not followed by later astronomers. 31 Crateris ended up in the constellation Corvus after formal boundaries were set in 1922. On 27 March 1974, the ''Mariner 10'' mission detected emissions in the far ultraviolet. These were initially thought to be Mercury's moon before the source was shown to be 31 Crateris. ==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「31 Crateris」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.