羽林军三十一,又名宝瓶座101,BD-21 6437,HD 221565、SAO 191988、HR 8939,是宝瓶座的一颗恒星[1][2],视星等为4.71,位于银经47.93,银纬-71.13,其B1900.0坐标为赤经23h 28m 2.6s,赤纬-21° -71.13′ 2″。
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