William Herschel discovered NGC 3860 = H III-386 on 27 Apr 1785 (sweep 403) and recorded "vF, vS, r." His position is 2' due south of UGC 6718, the brightest cluster member in the vicinity. The RNGC position is 0.2 min of RA too far west and 1' north.

300/350mm - 13.1" (2/25/84): very faint, small, diffuse.

400/500mm - 17.5" (3/12/88): fairly faint, fairly small, oval SW-NE, broad concentration. Member of galaxy cluster AGC 1367 with NGC 3862 13' SSE, NGC 3842 14' NW, CGCG 097-115 5' NNW and CGCG 097-131 6' NE. Nearby members included NGC 3860B = MCG +03-30-087 1.3' S and CGCG 097-113 2.2' S.

Notes by Steve Gottlieb