William Herschel discovered NGC 6106 = H II-151 = h1952 on 13 Apr 1784 (sweep 191) and recorded "not vF, pL, bM, roundish, r." JH logged "F; pL; lE; vgbM; 50" l, 40" br." and measured an accurate position.

200/250mm - 8" (7/5/83): very faint, small, slightly elongated N-S.

300/350mm - 13.1" (7/5/83): fairly faint, fairly small, brighter core.

400/500mm - 17.5" fairly faint, fairly small, gradually increases to a bright core, mottled appearance. A knot is visible on the west side (there is a brighter extension on the SW side on the POSS). A mag 15 star is 1.1' S of center and an extremely faint mag 16 star is just off the NNW end.

900/1200mm - 48" (5/10/18): at 375x; bright, large, elongated ~2:1 NW-SE, ~1.6'x0.8', large bright core, faint stellar nucleus. The large halo appeared as two irregular "wings", but there were no distinct spiral arms.

Notes by Steve Gottlieb