Arnold Schwassmann discovered IC 3366 = Sn. 105 on a plate taken with a 6" astrograph on 15 Feb 1900 at the Königstuhl Observatory in Heidelberg. His published RA is about 4 seconds too large. This galaxy is too faint to be included in the CGCG or MCG, so does not have a standard PGC number. As a result HyperLeda doesn't recognize LEDA 213994 as IC 3366.

900/1200mm - 48" (3/1/19): at 488x; between faint and fairly faint, small, elongated 2:1 NNW-SSE, ~15"x7". Situated just 40" S of the center of NGC 4424 and 0.3' SW of a 16th mag star.

Notes by Steve Gottlieb