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89 Aquarii
89 Aquarii is the Flamsteed designation for a binary star〔 system in the equatorial constellation of Aquarius. The apparent visual magnitude of +4.69〔 is bright enough to be seen with the naked eye. Its distance from Earth is roughly , based upon parallax measurements with an 11% margin of error.〔 The primary component of this system has a magnitude of 5.27 and a stellar classification of G3 II, which suggests this is an evolved star in the bright giant stage. The companion is an A-type main sequence star with a stellar classification of A2 V.〔 As of 2010, it is located at an angular separation of 0.1843 arcseconds along a position angle of 135.1°.〔 They orbit each other with an estimated period of 201 years and a semimajor axis of 0.45 arcseconds.〔 ==References==
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「89 Aquarii」の詳細全文を読む
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