天龍座40,又名BD+79 570,HD 166865、SAO 8994、HR 6809,是天龍座的一颗恒星[1][2],视星等为6.04,位于銀經111.78,銀緯28.91,其B1900.0坐标为赤經18h 7m 31.5s,赤緯+79° 28.91′ 17″。
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