天市左垣四(武仙座ο)也称中山,又名BD+28 2925,HD 166014、SAO 85750、HR 6779,是武仙座的一颗恒星[1][2],视星等为3.83,位于銀經55.19,銀緯21.59,其B1900.0坐标为赤經18h 3m 38.4s,赤緯+28° 21.59′ 55″。
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