Both of these galaxies appear out of place as large, somewhat ghostly (low surface brightness) galaxies in a rich star field. I might have assume they were faint emission nebulae. After the observation I found the secondary was dewed over and this likely degraded the view.

DeLisle Stewart found IC 4585 = D.S. 427, along with IC 4584, on a plate taken on19 Jul 1900 at Harvard's Arequipa Station. He noted "eF, S, iF."

600/800mm - 25" (4/3/19 - OzSky): at 244x; fairly faint, fairly large, elongated 5:2 SW-NE, 1.25'x0.5', very diffuse, broad concentration. A mag 11.3 star is off the NE end [1.4' from center]. Forms a pair with IC 4584 3.7' S. A group of a half-dozenmag 12-13 stars are between the two galaxies.

Notes by Steve Gottlieb