离宫二(飞马座μ),又名BD+23 4615,HD 216131、SAO 90816、HR 8684,是飞马座的一颗恒星[1][2],视星等为3.48,位于银经90.68,银纬-30.56,其B1900.0坐标为赤经22h 45m 10.5s,赤纬+24° -30.56′ 25″。
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