William Herschel discovered NGC 6104 = H III-688 = h1951 on 16 May 1787 (sweep 739) and recorded "vF, cS, iR." His RA was 10 seconds too large. JH made two observations and measured a more accurate position.

400/500mm - 17.5" (6/27/87): faint, small, slightly elongated, weak concentration. Located 8.4' W of mag 8.3 SAO 65198 in Zwicky Cluster 1615.8+3505.

600/800mm - 24" (6/12/15): at 375x; fairly faint, fairly small, round, 30" diameter, broad weak concentration, no nucleus. Forms a physical pair with CGCG 196-022 3.9' E. The companion appeared faint, very small, round, 15" diameter. Mag 8.3 HD 146914 lies 8.3' E and mag 8.2 HD 146621 is 10' SW.

Notes by Steve Gottlieb