John Herschel discovered NGC 4433 = h1273 on 16 Mar 1828 and noted "not vF; pL; lE; very ill-defined." His position is at the south edge of MCG -01-32-013 = PGC 40894.

400/500mm - 17.5" (2/28/87): moderately bright, moderately large, elongated ~N-S, broad concentration. Bracketed by two mag 14 stars at the north edge and 1.0' SW of center. Forms a pair with NGC 4428 7' N.

Notes by Steve Gottlieb