Stephane Javelle discovered IC 4580 = J. 3-1387, along with IC 4581 and 4582, on 26 Jul 1895. His micrometric offset lands precisely on CGCG 166-041 (his position for the reference star was off by 1' in dec).

400/500mm - 17.5" (7/3/97): extremely faint, small, elongated 0.5'x0.2' ~N-S, no concentration. A mag 12.5 star lies 1.8' ESE. 6th of 8 IC galaxies in a group.

Notes by Steve Gottlieb