William Herschel discovered NGC 1670 = H III-501 on 1 Feb 1786 (sweep 518) and noted "vF, vS." His position is 1.5' SSE of CGCG 394-017 = PGC 16107.
300/350mm - 13.1" (11/29/86): faint, small, round, bright core. A mag 14 star is close off the ESE edge 0.9' from center.
Notes by Steve Gottlieb