William Herschel discovered NGC 4403 = H III-75, along with NGC 4404, 5 on 20 Mar 1789 (sweep 913) and recorded both as "Two, both vF, vS, E, within 1 1/2' of each other." Neither galaxy was observed by JH.

400/500mm - 17.5" (5/19/01): NGC 4403 is the preceding and fainter member of close pair with NGC 4404 just 0.9' NE. Appears fairly faint, very elongated 3:1 SSW-NNE, 1.2'x0.4' with a brighter core.

Notes by Steve Gottlieb