狐狸座21,又名BD+28 3675,HD 192518、SAO 88391、HR 7731,是狐狸座的一顆恆星[1][2],視星等為5.18,位於銀經67.66,銀緯-3.27,其B1900.0坐標為赤經20h 10m 7.9s,赤緯+28° -3.27′ 30″。
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