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21 Arietis
21 Arietis is the Flamsteed designation for a binary star〔 system in the northern constellation of Aries. It has a combined apparent visual magnitude is 5.57;〔 the brighter member is magnitude 6.40 while the fainter star is magnitude 6.48.〔 The distance to this star system, based upon an annual parallax shift of 19.58 mas,〔 is . The pair orbit each other with a period of 23.70 years and an eccentricity of 0.68.〔 ==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「21 Arietis」の詳細全文を読む
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