仙王座4(天鈎一),又名BD+66 1318,HD 197950、SAO 19004、HR 7945,是仙王座的一顆恆星[1][2],視星等為5.58,位於銀經101.72,銀緯14.68,其B1900.0坐標為赤經20h 41m 56.1s,赤緯+66° 14.68′ 38″。
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