NGC 3891 (also UGC 6772, MCG 5-28-31, ZWG 157.35, PGC 36832) is a magnitude +12.7 spiral galaxy located 290 million lightyears away in the constellation Ursa Major.
The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) reflecting telescope at Windsor Road, Slough, on the 3rd February 1788.
Right Ascension 11h 48m 03.2s, Declination +30° 21' 35"
