Sherburne Wesley Burnham discovered IC 366 on 5 Oct 1890, while observing NGC 1550 with the 36" refractor at Lick Observatory. He noted "That found by d'Arrest NGC 1550] is at least six or eight times brighter than the other. There is a faint star, about 13m, between the two." His micrometric offset from NGC 1550 is very accurate.

600/800mm - 24" (12/28/16): at 282x; faint, very small, round, 12" diameter. Closest galaxy to NGC 1550 in a large group at z = .012.

24" (12/22/14): faint, small, round, 12" diameter. Located 3.1' SSE of much brighter NGC 1550.

Notes by Steve Gottlieb