Lawrence Parsons, the 4th Earl of Rosse, discovered NGC 3410 on 1 Apr 1878 while observing GC 2222 = NGC 3406. He reported "2 neb, pos 121.6°, dist 115.2". The actual separation is ~110" and the identification with MCG +09-18-042 is certain.

400/500mm - 17.5" (4/22/95): very faint, very small, round, low surface brightness, no concentration. A mag 14 star is 2' SSE. Located 1.8' SE of double system NGC 3406.

Notes by Steve Gottlieb