DeLisle Stewart discovered IC 2580 = DS 346 on a plate taken 1 May 1900 at Harvard's Arequipa station. He noted "cB, S, bM."

400/500mm - 18" (4/25/09): faint, moderately large, round, 50" diameter. Appears as a diffuse, low surface brightness hazy glow with only a weak central brightening. Located 9.4' NW of brighter ESO 436-027 in the southern group Klemola 11. A 35" pair of mag 9.6/10.8 stars lies 9' SW.

Notes by Steve Gottlieb