William Herschel discovered NGC 4328 = H II-84 on 21 Mar 1784 (sweep 182) and noted "It [M100] is followed at the distance of 6 or 8' by another distinct F, S, R, r nebula which is nearly in the same parallel with the great one." The NGC RA is 9 seconds too small, but the identification is certain. Nevertheless, it was found again on plates taken with the Crossley reflector in 1898-1900, and catalogued as a new nebula (#465 of 744) in the 1908 Publications of Lick Observatory, Vol VIII.

400/500mm - 17.5" (5/23/87): extremely faint, small, round. A mag 14.5 star is 1.4' NE of center. Located 6' due east of M100!

Notes by Steve Gottlieb