英仙座21,又名BD+31 509,HD 18296、SAO 56031、HR 873,是英仙座的一顆恆星[1][2],視星等為5.11,位於銀經151.88,銀緯-23.77,其B1900.0坐標為赤經2h 51m 12.9s,赤緯+31° -23.77′ 54″。
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