John Herschel discovered NGC 5156 = h3510 on 31 Mar 1835 and recorded "pB; lE; glbM; has a * 8m 5' dist; pos sp."

300/350mm - 13.1" (2/19/04 - Costa Rica): moderately bright, oval 4:3 WNW-ESE, broad concentration. A faint star is superimposed and another faint star is at the SE edge. Located 3.8' NNE of mag 7.7 HD 117036. Starhopped from Omega Centauri just 1.3° to the NW! In a group of galaxies (including NGC 5064 and ESO 269-057) with similar redshifts mostly close west of Omega Centauri.

Notes by Steve Gottlieb