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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 Tau Herculis ： ウィキペディア英語版 Tau Herculis Tau Herculis (τ Her, τ Herculis) is a fourth-magnitude star in the constellation Hercules. Its traditional name Rukbalgethi Shemali, though seldom used today in scientific journals, means the "northern knee". It is a blue subgiant star, seven hundred times more luminous than the Sun. == Properties == Tau Herculis is a blue subgiant star with stellar classification B5IV. Its mass is 4.9 times solar.〔 Though its apparent magnitude is only 3.89, like all B-class stars, it is very luminous boasting a total bolometric luminosity that is 700 times solar.〔 Hipparcos estimated its distance at roughly 96 parsecs from Earth, or 310 ± 20 light years away. == Etymology == Its traditional name Rukbalgethi Shemali is of Arabic origin and shares certain etymological characteristics with the stars Ruchbah and Zubeneschamali signifying Hercules' "northern knee". The star was the north pole star around the year 7400 BC, a phenomenon which is expected to reoccur in the year 18,400 due to precession.〔 In Chinese, (), meaning ''Seven Excellencies'', refers to an asterism consisting of τ Herculis, 42 Herculis, φ Herculis, χ Herculis, ν1 Boötis, μ1 Boötis and δ Boötis.〔 ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.〕 Consequently, τ Herculis itself is known as (, (英語:the Second Star of Seven Excellencies).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 26 日 )〕 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「Tau Herculis」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.