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The star HD 171978 is a spectroscopic binary in the constellation of Serpens. It consists of two A-type main sequence stars orbiting each other with a period of approximately 14.7 days.〔 The overall apparent visual magnitude of the system varies between 5.74 and 5.86.〔 ==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「HD 171978」の詳細全文を読む スポンサード リンク
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