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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 Σ 2398 ： ウィキペディア英語版 Struve 2398 Struve 2398 (Gliese 725〔Mitchell Charity. (What color are the stars? )〕) is a binary star system in the constellation Draco. Both stars are red dwarfs and both display variability common to flare stars. The orbital period for the pair is about 295 years, with an average distance of about 56 astronomical units,〔(【引用サイトリンク】 url=http://www.solstation.com/stars/st2398ab.htm )〕 and the eccentricity of the orbit is 0.70. Struve 2398 is star number 2398 in the Struve Double Star Catalog of Baltic-German astronomer Friedrich Georg Wilhelm von Struve. The astronomer's surname, and hence the star identifier, is sometimes indicated by a Greek sigma, Σ. ==X-ray source== Gliese 725 A and B are sources of X-rays.〔 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「Struve 2398」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.