It appeared extremely faint and small, round, ~10" (on the SDSS image it appears larger). The observation required averted vision and the glow was only occasionally glimpsed but the position was verified and I felt confident of the sighting. Located 1.4° ENE of M64, the Black-Eye Galaxy.

Max Wolf discovered IC 4107 = W. VI-165, along with several other faint IC galaxies within AGC 1638, on a Heidelberg plate taken 27 Jan 1904.

900/1200mm - 48" (4/2/11): Wolfgang Steinicke lists IC 4107 as the faintest galaxy with a photographic magnitude of 18.5. The SDSS has several entries, so the photometry is unreliable. In any case, it is certainly one of the lowest in surface brightness.

Notes by Steve Gottlieb