IC 4633 resides in a fairly rich star field 15' W of mag 8.7 HD 153435. Deep images show the field is awash in very faint galactic nebulosity (interstellar flux nebula = IFN) and the galaxy appears to be emmersed in the nebulosity.

DeLisle Stewart discovered IC 4633 = D.S. 437 on a plate taken 17 Aug 1900 at Harvard's Arequipa Station. He noted "!very faint, cL, cbM, possibly spiral."

600/800mm - 25" (10/15/17 - OzSky): at 244x; fairly faint, very large, slightly elongated NW-SE, low surface brightness. Contains a relatively small brighter core. The halo appears to fade into the background with no distinct edge but perhaps 3' along the major axis. Brightest in a trio (KTS 54) with IC 4635 6.7' NE and ESO 044-010 22' NE.

Notes by Steve Gottlieb