DeLisle Stewart discovered IC 3104 = D.S. 357 on a plate taken on 22 May 1900 at Harvard's Arequipa Station. He noted "eeF, cS, or v S Cl, * 12 sp 0.5'."

600/800mm - 25" (3/31/19 - OzSky): this nearby galaxy (7.4 million l.y.) is located 25' S of mag 4.2 Beta Cha at the edge of the Chamaeleon III cloud in an obscured region. At 244x; fairly faint, fairly large, oval 2:1 SW-NE, ~1.3'x0.6'. The galaxy has a low surface brightness with no obvious core or zones but it appeared somewhat uneven or patchy with an occasional dim knot to the NE of center. A mag 13.2 star is superimposed on the SW side. A mag 10.6 star is 2.7' NW.

Notes by Steve Gottlieb