Heinrich d'Arrest discovered NGC 791 on 3 Dec 1861 with the 11-inch refractor at Copenhagen. He noted a mag 13-14 star that follows by 11.5 seconds and measured the position on 3 nights.

400/500mm - 17.5" (11/27/92): faint, small, round, even concentration, very small bright core, very symmetrical appearance. Located 3.3' SW of a mag 10 star. A mag 12.5 star is 2.8' E of center.

Notes by Steve Gottlieb