后发座5,又名BD+21 2398,HD 106057、SAO 82182、HR 4643,是后发座的一颗恒星[1][2],视星等为5.57,位于银经247.11,银纬78.87,其B1900.0坐标为赤经12h 7m 4.1s,赤纬+21° 78.87′ 56″。
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