星宿二(長蛇座τ¹),又名BD-02 2901,HD 81997、SAO 136895、HR 3759,是長蛇座的一顆恆星[1][2],視星等為4.6,位於銀經236.23,銀緯32.86,其B1900.0坐標為赤經9h 24m 4.3s,赤緯-2° 32.86′ 55″。
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