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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 91 Aquarii ： ウィキペディア英語版 91 Aquarii 91 Aquarii, also known as Psi1 Aquarii (, ), is the Flamsteed designation for a triple star〔 system in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of +4.248.〔 Parallax measurements yield an estimated distance of around from Earth.〔 An extrasolar planet is known to orbit the main star. == Stellar system == 91 Aquarii is a triple star system.〔 The primary component, 91 Aqr A, is a giant star with a stellar classification of K0 III.〔 This is an evolved star with 174% of the Sun's mass that has expanded to over 10 times the size of the Sun.〔 It is radiating 49〔 times the Sun's luminosity from its outer envelope at an effective temperature of 4,603 K.〔 This gives it the orange-hued glow of a K-type star.〔 The primary shares a common proper motion with two others stars, 91 Aqr B and C, suggesting that they are physically connected.〔 The latter pair form a binary system located at an angular separation of 52 arcseconds from the primary.〔 They are 10th magnitude stars separated by 0.3 arcseconds from each other. Because it lies near the same line of sight, the binary star system CCDM J23159-0905DE was listed to belong to the 91 Aquarii system according to the (CCDM catalogue ). However, it is listed as physically unconnected in the (WDS catalogue ) and the pair have a different proper motion than 91 Aquarii.〔 CCDM J23159-0905DE has two components, the 13th magnitude CCDM J23159-0905D 80.4 arcseconds from 91 Aquarii, and the 14th magnitude CCDM J23159-0905E 19.7 arcseconds from 91 Aquarii. 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「91 Aquarii」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.