NGC 4172 is a 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 . Additionally, 11 non-redshift measurements give a closer mean distance of . It was discovered by German-British astronomer William Herschel on 14 April 1789.
NGC 4172 is a LINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.
Supernova One supernova has been observed in NGC 4172: SN 2006az (TypeIa, mag. 17.1) was discovered by Jack B. Newton, L. Cox, and Tim Puckett on 23 March 2006.
See also List of NGC objects (4001–5000)
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