John Herschel discovered NGC 3907 = h990 on 15 Apr 1828 and noted "eF; S; psbM." His position is just off the south side of UGC 6796, though his missed the nearby companion to the west.

400/500mm - 18" (4/9/05): This is a close pair of galaxies (NGC 3907A/B) although John Herschel only recorded a single object. The eastern component has a fairly high surface brightness and appears fairly faint, very small, slightly elongated SW-NE, 0.4'x0.3' (viewed core only and missed the much fainter extensions). Forms a close 1.7' pair with NGC 3907B = UGC 6793 just west. The companion appears as a faint edge-on, ~3:1 WSW-ENE, 0.9'x0.25', low even surface brighness. UGC 6793 is larger, though has a lower surface brightness than NGC 3907. Both galaxies were comparable in ease of viewing so it's surprising that Herschel missed one.

Notes by Steve Gottlieb