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NGC 4491 is a dwarf barred spiral galaxy[2] located about 55 million light-years away[3] in the constellation Virgo.[4] NGC 4491 was discovered by astronomer William Herschel on March 15, 1784.[5] NGC 4491 is located in a subgroup of the Virgo Cluster centered on Messier 87 known as the Virgo A subgroup.[2]
^ abcdefgh"NASA/IPAC Extragalactic Database". Results for NGC 4491. Retrieved 2017-10-21.
^ abcRoussel, H.; Helou, G.; Beck, R.; Condon, J. J.; Bosma, A.; Matthews, K.; Jarrett, T. H. (2 May 2003). "Nascent Starbursts in Synchrotron‐deficient Galaxies with Hot Dust". The Astrophysical Journal. 593 (2): 733–759. arXiv:astro-ph/0305046. Bibcode:2003ApJ...593..733R. doi:10.1086/376691. S2CID 122402426.
^"Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-10-22.
^Rojas, Sebastián García. "Galaxy NGC 4491 - Barred Spiral Galaxy in Virgo Constellation · Deep Sky Objects Browser". DSO Browser. Retrieved 2017-10-22.
^"New General Catalog Objects: NGC 4450 - 4499". cseligman.com. Retrieved 2017-10-08.
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