George Johnstone Stoney, Lord Rosse's assistant, discovered NGC 4400, along with NGC 4399, on 13 Apr 1850. See notes on NGC 4399.

400/500mm - 17.5" (5/15/99): very small HII knot in NGC 4395 situated 0.9' SSW of brighter NGC 4401. Shows up well at 220x, although only 15" in size and no other details.

17.5" one of a pair of knots in the SE end of galaxy NGC 4395. The smaller and fainter of the pair (probably NGC 4400) is very faint, fairly small and is close SSW of NGC 4401.

Notes by Steve Gottlieb