William Herschel discovered NGC 4313 = H II-63 = h1207 on 15 Mar 1784 (sweep 174) and noted "E, resembling the former two [NGC 4294 and 4299]. His position on this sweep is 1.0 tmin too large. A similar error was made on several nebulae discovered on that night including NGCs 3810, 4067, 4294, 4313, 4352, 4371, and 4429. John Herschel made two observations, recording on 11 Apr 1823 (only his 3rd registered sweep), "eF; E 45° np, resolved in middle." His position is accurate.

400/500mm - 17.5" (4/18/87): moderately bright, moderately large, very elongated NW-SE, very small bright core. Located 22' NE of the NGC 4294/NGC 4299 pair in the same low power field.

600/800mm - 24" (5/29/14): fairly bright, fairly large, very elongated 7:2 NW-SE, 2.1'x0.6', bright, elongated core increases to a faint stellar nucleus, mottled surface. The northwest extension seems slightly brighter and longer and in addition is slightly tilted with respect to the major axis of the core.

Notes by Steve Gottlieb