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Chi Aquarii (χ Aqr, χ Aquarii) is the Bayer designation of a star in the equatorial constellation of Aquarius. The distance to this star, based upon parallax measurements with a 7% margin of error, is roughly .〔 It is visible to the naked eye with an apparent visual magnitude of +5.06.〔 This is a red giant star with a spectral classification of M3 III.〔 The interferometry-measured angular diameter of this star is ,〔 which, at its estimated distance, equates to a physical radius of about 137 times the radius of the Sun.〔 It is classified as a semi-regular variable star and its brightness varies by an amplitude of 0.0636 in magnitude.〔 The identified pulsation periods are 32.3, 38.5, and 44.9 days.〔 ==References== } \\ & \approx 274\cdot R_ \end〕 }} 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「Chi Aquarii」の詳細全文を読む スポンサード リンク
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