Bigourdan discovered IC 839 = Big. 179 on 12 May 1885. His position corresponds with CGCG 160-057 = PGC 44423, although most modern sources equate IC 839 with NGC 4851 (double system) or just the northern component of NGC 4851.

600/800mm - 24" (6/3/19): at 322x; faint, fairly small, slightly elongated E-W, ~15"x10". This member of AGC 1656 (Coma Galaxy Cluster) is located 2' SW of NGC 4851.

Notes by Steve Gottlieb