William Herschel discovered NGC 6146 = H III-638 = h1958 on 18 Mar 1787 (sweep 718) and noted "vF, vS." CH's reduced position is 7 sec of RA east of UGC 10379.

300/350mm - 13.1" (8/5/83): fairly faint, moderately large. Forms a pair with NGC 6145.

400/500mm - 17.5" (7/24/95): moderately bright, fairly small, 1.0' diameter, slightly elongated E-W. Broad concentration with a fairly high surface brightness core, stellar nucleus. A mag 13 star is 1.2' E of center. Brightest of a collinear trio with NGC 6145 3.6' NNW and NGC 6147 2' NNW in AGC 2197.

17.5" (7/5/86): fairly faint, almost round, bright core, stellar nucleus. Forms a pair with NGC 6145 3.5' NW.

Notes by Steve Gottlieb