William Herschel discovered NGC 5599 = H III-927 = h1794 on 12 May 1793 (sweep 1043) and noted "vF, S." His position is at the south edge of UGC 9218. JH made a total of 4 observations.

400/500mm - 17.5" (6/1/02): fairly faint, fairly small, elongated 5:2 NNW-SSE, 1.2'x0.5', fairly even surface brightness. Located 10' NNE of a 1' pair of mag 8.5 (SAO 120428) and 10 stars. The compact group Shkh 358 is close NE.

Notes by Steve Gottlieb