上衛(左垣)也稱天龍座73、紫微左垣六,又名BD+74 872,HD 196502、SAO 9802、HR 7879,是天龍座的一顆恆星[1][2],視星等為5.2,位於銀經108.43,銀緯20.04,其B1900.0坐標為赤經20h 32m 49.8s,赤緯+74° 20.04′ 43″。
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