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Tau4 Serpentis : ウィキペディア英語版 | Tau4 Serpentis
Tau4 Serpentis (Tau4 Ser, τ4 Serpentis, τ4 Ser) is a M-type bright giant star in the constellation of Serpens, approximately 520 light-years from the Earth.〔 It is classified as a semiregular late-type variable star, and its magnitude varies between +5.89 and +7.07 with a period of approximately 100 days.〔 τ4 is unique among the stars with the Bayer designation τ Serpentis as being the only one with no HR catalog number. ==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「Tau4 Serpentis」の詳細全文を読む
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