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Tau Orionis (τ Ori, τ Orionis) is a star in the constellation Orion. This star, along with β Eri, λ Eri and ψ Eri were Al Kursiyy al Jauzah, "the Chair (or "Footstool") of the Central One" According to the catalogue of stars in the ''Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars'', ''Al Kursiyy al Jauzah'' were the title for three stars: β Eri as ''Cursa'', ψ Eri as ''Al Kursiyy al Jauzah I'' and λ Eri as ''Al Kursiyy al Jauzah II'' (exclude this star)〔(Jack W. Rhoads - ''Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars'', Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971 )〕 In Chinese, (), meaning ''Jade Well'', refers to an asterism consisting of τ Orionis, β Eridani, λ Eridani and ψ Eridani.〔 ''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 Orionis itself is known as (, (英語:the Fourth Star of Jade Well).).〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 15 日 )〕 From this Chinese name, the name Yuh Tsing was appeared〔(Richard Hinckley Allen: Star Names — Their Lore and Meaning: Orion )〕 ==Properties== Tau Orionis has an apparent magnitude of 3.59, meaning it is visible to the naked eye, and belongs to the spectral class B5III. If an imaginary line is drawn north-west between the stars Rigel and Mintaka, Tau Orionis can be found roughly one-sixth of the way to Mintaka. 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 Orionis」の詳細全文を読む スポンサード リンク
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