| NGC 4491 | |
|---|---|
 SDSS image of NGC 4491. | |
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 12h 30m 57.1s[1] |
| Declination | 11° 29′ 01″[1] |
| Redshift | 0.001658/497 km/s[1] |
| Distance | 55,420,000 ly[2] |
| Group or cluster | Virgo Cluster |
| Apparent magnitude (V) | 13.5[1] |
| Characteristics | |
| Type | SB(s)a[1] |
| Size | ~7,140 ly (estimated)[1] |
| Apparent size (V) | 1.7 x 0.9[1] |
| Other designations | |
| PGC 41376, UGC 7657, VCC 1326[1] | |
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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]
- ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 4491. Retrieved 2017-10-21.
- ^ a b c Roussel, 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.