Royal Frost discovered IC 3470 = F. 950 on a plate taken on 10 May 1904 at Harvard's Arequipa Observatory in Peru. He noted, "bM, magn 13.5."

600/800mm - 24" (5/20/17): fairly faint, small, round, 18" diameter, very weak concentration. Picked up 6.6' NE of NGC 4503.

24" (6/4/16): fairly faint, fairly small, round, 20" diameter, weak concentration. Located 6.7' NE of NGC 4503.

Notes by Steve Gottlieb