John Herschel discovered NGC 4938 = h1521 on 17 Feb 1831 and recorded "eF; R; psbM." His position matches CGCG 270-042 = PGC 45044.
400/500mm - 18" (6/27/03): very faint, small, irregularly round, 0.6'x0.5', low nearly even surface brightness.
Notes by Steve Gottlieb