William Herschel discovered NGC 3618 = H III-334 on 10 Apr 1785 (sweep 394) and noted "vF, S, goes into the field with the foregoing [NGC 3615]." CH's reduction is 3.6' northwest of UGC 6327 (similar offset as[NGC 3615).

NGC 3618 was assumed to be a new on the 23 Mar 1857 observation by R.J. Mitchell at Birr Castle: "about 6' or 7' nf [NGC 3615] is a S, vvF patch, lbM." JH included this observation in the GC (2365) as well as GC 2368 = III-334. In the 1880 compilation of LdR observations, Dreyer added the note "the latter [GC 2365] is not a "nova" but = III 334, as pointed out by d'Arrest. GC 2365 is to be struck out."

400/500mm - 17.5" (4/9/99): faint, fairly small, round, 1.0' diameter, weak concentration. Third of three on a line with CGCG 126-022 and NGC 3615 7' SW. At low power collinear with two mag 10 stars equally spaced 8' and 17' NE.

Notes by Steve Gottlieb