離宮二(飛馬座μ),又名BD+23 4615,HD 216131、SAO 90816、HR 8684,是飛馬座的一顆恆星[1][2],視星等為3.48,位於銀經90.68,銀緯-30.56,其B1900.0坐標為赤經22h 45m 10.5s,赤緯+24° -30.56′ 25″。
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