William Herschel discovered NGC 3106 = H II-320 = h666 on 13 Mar 1785 (sweep 386) and logged "F, pS, R, lbM." John Herschel noted on 27 Jan 1827 (sweep 56), "F; S; R; smbM; is equal to a * 12m."

400/500mm - 17.5" (4/9/94): fairly faint, fairly small, round, 1.2' diameter, sharply concentrated with faint halo and abrupt bright nucleus. A mag 13.7 star is 2.7' N of center. Situated almost at the midpoint of a mag 11.5 star 5.3' WNW and a mag 12 star 4.9' ESE.

Notes by Steve Gottlieb