William Herschel discovered NGC 3400 = H II-361 = h768 on 11 Apr 1785 (sweep 396) and simply noted "F". John Herschel made 3 observations, calling it both "faint" (17 Feb 1827) and "pretty bright" (13 Apr 1831).

400/500mm - 17.5" (4/22/95): fairly faint, elongated 3:2 WNW-ESE, 1.2'x0.7'. Fairly even concentration to a small bright core and stellar nucleus. Located 6.2' WSW of mag 9.1 SAO 81552.

Notes by Steve Gottlieb