NGC 4492

NGC 4492 is a spiral galaxy[4] located about 90 million light-years away [2] in the constellation Virgo.[5] NGC 4492 was discovered by astronomer William Herschel on December 28, 1785. It was rediscovered by astronomer Arnold Schwassmann on January 23, 1900 and was listed as IC 3438.[6] NGC 4492 lies in the direction of the Virgo Cluster. However, it is not considered to be a member of that cluster.[7]

NGC 4492
SDSS image of NGC 4492.
Observation data (J2000 epoch)
ConstellationVirgo
Right ascension12h 30m 59.7s[1]
Declination08° 04′ 40″[1]
Redshift0.005804/1740 km/s[1]
Distance90,950,000 ly[2][3]
Apparent magnitude (V)13.0[1]
Characteristics
TypeSA(s)a?[1]
Size~33,450 ly (estimated)[1]
Apparent size (V)1.58 x 1.25[1]
Other designations
IC 3438, PGC 41383, UGC 7656, VCC 1330[1]

Physical characteristics

NGC 4492 has a relatively large bulge while showing signs of weak spiral structure.[7] The spiral arms are also outlined by lanes of Interstellar dust.[8]

Virgo Cluster membership

NGC 4492 is listed in the Virgo Cluster Catalog as VCC 1330.[8] However, distances estimates to the galaxy place it at a location far outside of the cluster's center.[2][7] Also, its radial velocity indicates that NGC 4492 is not gravitationally bound to the Virgo Cluster but is expanding away from it. Therefore, NGC 4492 is not a member of the Virgo Cluster but rather a background galaxy.[7]

See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 4492. Retrieved 2017-10-25.
  2. Carmen Toribio, M.; Solanes, Jose M. (10 November 2009). "H i DISTRIBUTION AND TULLY–FISHER DISTANCES OF GAS-POOR SPIRAL GALAXIES IN THE VIRGO CLUSTER REGION". The Astronomical Journal. 138 (6): 1957–1968. arXiv:0909.3615. Bibcode:2009AJ....138.1957T. doi:10.1088/0004-6256/138/6/1957. S2CID 15207214.
  3. "parsecs to lightyears conversion". Retrieved 2017-09-30.
  4. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2017-10-27.
  5. Rojas, Sebastián García. "Galaxy NGC 4492 - Spiral Galaxy in Virgo Constellation · Deep Sky Objects Browser". DSO Browser. Retrieved 2017-10-27.
  6. "New General Catalog Objects: NGC 4450 - 4499". cseligman.com. Retrieved 2017-10-27.
  7. Sanchis, T.; Mamon, G. A.; Salvador-Solé, E.; Solanes, J. M. (2004-05-01). "The origin of H I-deficiency in galaxies on the outskirts of the Virgo cluster". Astronomy & Astrophysics. 418 (2): 393–411. arXiv:astro-ph/0401367. Bibcode:2004A&A...418..393S. doi:10.1051/0004-6361:20034158. ISSN 0004-6361. S2CID 18787428.
  8. Binggeli, B.; Sandage, A.; Tammann, G. A. (1985). "Studies of the Virgo Cluster. II – A catalog of 2096 galaxies in the Virgo Cluster area". Astronomical Journal. 90: 1681–1759. Bibcode:1985AJ.....90.1681B. doi:10.1086/113874.


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