William Herschel discovered NGC 3756 = H II-784 = h918 on 14 Apr 1789 (sweep 920) and recorded "pB, cL, lE, 3' long." His position matches UGC 6579.

200/250mm - 8" (3/28/81): very faint, low surface brightness. Located 15' SE of NGC 3738.

300/350mm - 13.1" (3/24/84): fairly large, diffuse, elongated N-S.

400/500mm - 17.5" (3/19/88): moderately bright, large, oval 2:1 N-S, even surface brightness. A mag 10 star is 4.0' NNW of center.

600/800mm - 24" (5/27/17): bright, large, elongated ~2:1 N-S, ~3.5'x1.7'. Uneven, moderate surface brightness (except low surface brighterness outer halo) but no distinct core or nucleus. The halo (arms) is not symmetric and change shape with different brighter patches (parts of spiral arms) using averted vision. Often the north half of the galaxy appeared brighter. NGC 3738 is 16' NW. Member of the NGC 3898 Group = LGG 250 (UMa NED2 Group).

Notes by Steve Gottlieb