Heinrich d'Arrest discovered NGC 4788 on 23 Apr 1865 with the 11-inch refractor at Copenhagen. His position is 4 sec of RA west of CGCG 159-112 = PGC 4387 and he mentions the mag 10 star that precedes by 6 sec of RA.

400/500mm - 17.5" (5/14/94): faint, very small, round, 20" diameter. Located 1.3' E of a mag 10.5 star. NGC 4798 lies 10.9' NE. Member of AGC 1656.

Notes by Steve Gottlieb