William Herschel discovered NGC 3928 = H II-740 = h999 on 9 Mar 1788 (sweep 816) and noted "pF, pS, stellar." Caroline Herschel's reduction is 1.7' northeast of UGC 6834. JH called it "not vF; S; R; pspmbM" and measured an accurate position.

400/500mm - 17.5" (4/7/89): fairly faint, small, slightly elongated SSW-NNE, small bright core, stellar nucleus. Bracketed between a mag 13.5 star 1.3' SE and a mag 14 star 1.9' NNW of center. Member of the NGC 3877 subgroup of the M109 (NGC 3992) group = LGG 258.

Notes by Steve Gottlieb