NGC 3891 is a large spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . However, 10 non-redshift measurements give a slightly farther mean distance of . It was discovered by German-British astronomer William Herschel on 3 February 1788.
NGC 3891 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms. It is also a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.
NGC 3891 is a member of the Coma cluster.
Supernovae Two supernovae have been observed in NGC 3891: SN 2006or (TypeIa, mag. 16.3) was discovered by Tim Puckett and A. Kroes on 18 November 2006. SN 2018bdv (TypeII-P, mag. 18.53) was discovered by Gaia Photometric Science Alerts on 29 April 2018.
See also List of NGC objects (3001–4000)
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