William Herschel discovered NGC 4133 = H I-278 = h1100 on 12 Dec 1797 (sweep 1068) and noted "cB, cL, iR, mbM." His position matches UGC 7127, though Dreyer thought that WH exchanged the PD with this object and NGC 4127. On 6 May 1831 (sweep 349), John Herschel called it "F; R; gbM. Strong twilight" and measured an accurate position. On a later sweep he logged "pB; R; gbM."

400/500mm - 17.5" (5/2/92): fairly faint, fairly small, elongated 3:2 NW-SE, irregular surface brightness with one or two bright knots possibly including a substellar nucleus. Forms the vertex of a right angle with a mag 12 star 2.5' N and a mag 13 star 2.2' E of center. Located 18' NNW of mag 6.4 SAO 7512.

Notes by Steve Gottlieb