Royal Frost discovered IC 4473 = F. 1123 on a plate taken on 10 May 1904 at Harvard's Arequipa Observatory in Peru.

600/800mm - 24" (7/1/19): IC 4473 is an interacting contact system with the two nuclei separated by 11" N-S. At 225x; fairly faint, elongated 3:2 N-S, ~24"x15", strong sense of two cores. Increasing to 375x; the two close nuclei were definitely visible at times within a common halo.

Notes by Steve Gottlieb