William Herschel discovered NGC 3670 = H III-337 = h884 on 10 Apr 1785 (sweep 394) and noted "vF, S." His single position (CH's reduction) is 4' northwest of UGC 6427, the brightest galaxy in the vicinity. JH called this galaxy "eF; vS; R" and measured a fairly accurate position.

400/500mm - 18" (5/31/03): fairly faint, fairly small, slightly elongated SW-NE, 0.7'x0.5'. Moderate concentration with faint extensions and a small, brighter core.

Notes by Steve Gottlieb