William Herschel discovered NGC 3535 = H III-111 = h823 on 18 Apr 1784 (sweep 201) and recorded "vF, vS, r, 240x confirmed it." There is nothing at his position, but 33 seconds of RA west and 1.5' north is UGC 6189. John Herschel measured an accurate position. In Dreyer's 1912 revision of WH's catalogues, he explained issues with the telescope that led to different reductions between Auwers and Caroline Herschel.

400/500mm - 17.5" (3/22/96): faint, small, round, 30" diameter, brighter core. A mag 15 star is just 43" E of center.

Notes by Steve Gottlieb