Edward Swift, Lewis' 20 year-old son, discovered IC 664 = Sw. X-19 (along with IC 663) on 29 Mar 1891. The description reads "eF; pS; R; 2nd of 3; NGC 3492 near." Stephane Javelle independently found it at the Nice Observatory on 22 Mar 1892.

400/500mm - 17.5" (4/25/98): this is the second brightest of four viewed in AGC 1142, located 4.1' NW of NGC 3492. Appeared faint, small, slightly elongated [SW-NE], 30" diameter, stellar nucleus at moments with direct vision.

Notes by Steve Gottlieb