HD 645,又名BD-13 13,SAO 147127、HR 31,是一颗恒星[1][2],视星等为5.85,位于银经87.69,银纬-72.6,其B1900.0坐标为赤经0h 5m 35.5s,赤纬-13° -72.6′ 7″。
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