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Iota Boötis (ι Boo, ι Boötis) is a star system in the constellation Boötes. It has the traditional name Asellus Secundus (Latin for "second donkey colt")〔(Star Name - R.H.Allen p.105 )〕 and the Flamsteed designation 21 Boötis. This star, along with the other ''Aselli'' (θ Boo and κ Boo) and λ Boo, were Al Aulād al Dhiʼbah (أولاد الضّباع - ''al aulād al dhiʼb''), "the Whelps of the Hyenas".〔 In Chinese, (), meaning ''Celestial Spear'', refers to an asterism consisting of ι Boötis, κ2 Boötis and θ 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, ι Boötis itself is known as (, (英語:the Second Star of Celestial Spear).)〔 (香港太空館 - 研究資源 - 亮星中英對照表 ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕 Iota Boötis is a double star, with components at an angular distance of 38.6 arcseconds, easily separated with binoculars. It is approximately 97 light years from Earth. ==Components== The primary component, Iota Boötis A, is a white A-type main sequence dwarf with a mean apparent magnitude of +4.75. It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.73 to +4.78. The companion, Iota Boötis B, is a magnitude +8.27 star belonging to spectral class A2. 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「Iota Boötis」の詳細全文を読む スポンサード リンク
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