Lewis Swift discovered NGC 6370 = Sw. I-57 on 19 Apr 1885 and recorded "vF; vS; R; B * nr n." His position is just off the west side of UGC 10836 with the mag 6.5 star 2.3' north.

400/500mm - 17.5" (6/18/88): fairly faint, small, round, weak concentration. Located 2.2' S of mag 6.6 SAO 30366!

600/800mm - 24" (6/30/16): at 324x; moderately bright, fairly small, round, 25"-30" diameter, bright core. Situated just 2.2' SSE of mag 6.5 HD 158013. The extremely low surface brightness outer halo was not seen.

NGC 6370 is the brightest member of a cluster (SDSS-C4-DR3 3375). The Ring Galaxy CGCG 277-42 lies 10' SE. At 324x; fairly faint, small, round, 12" diameter, faint stellar nucleus. The detached outer ring was not seen although the halo occasionally increased in size with averted vision. Forms the northwest vertex of a triangle with a mag 11 star 3.6' S and a mag 11.5 star 3.1' ESE. FGC 2132 is 15' SE. This superthin appeared extremely faint, small, elongated 2:1 SSW-NNE, ~15"x7" (brighter core region). A mag 11.5 star is 3.2' WNW and a mag 13 star is 0.9' NE.

Notes by Steve Gottlieb