William Herschel discovered NGC 6143 = H II-811 on 24 Apr 1789 (sweep 928) and recorded "pB, iR, vgvlbM." His position (CH's reduction) is 20 sec of RA east of UGC 10358.

400/500mm - 17.5" (6/20/87): fairly faint, fairly small, round, weak concentration. Bracketed by two bright stars; a mag 10 star 2.3' ESE and mag 8.7 SAO 29911 4.0' W.

Notes by Steve Gottlieb