牧夫座ο,又名BD+17 2780,HD 129972、SAO 101184、HR 5502,是牧夫座的一顆恆星[1][2],視星等為4.6,位於銀經17.74,銀緯61.82,其B1900.0坐標為赤經14h 40m 34.4s,赤緯+17° 61.82′ 16″。
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