NGC 4490

NGC 4490, also known as the Cocoon Galaxy, is a barred spiral galaxy in the constellation Canes Venatici. It lies at a distance of 25 million light years from Earth. It interacts with its smaller companion NGC 4485 and as a result is a starburst galaxy. NGC 4490 and NGC 4485 are collectively known in the Atlas of Peculiar Galaxies as Arp 269. NGC 4490 is located 3/4° northwest of beta Canum Venaticorum and with apparent visual magnitude 9.8, can be observed with 15x100 binoculars.[2] It is a member of Herschel 400 Catalogue. It belongs in Canes Venatici galaxy cloud II.

NGC 4490
Observation data (J2000 epoch)
ConstellationCanes Venatici
Right ascension12h 30m 36.2s[1]
Declination41° 38′ 38″[1]
Redshift565 ± 3 km/s[1]
Distance25.1 ± 5.0 Mly (7.7 ± 1.5 Mpc)[1]
Apparent magnitude (V)9.8
Characteristics
TypeSB(s)d pec [1]
Apparent size (V)6′.3 × 3′.1[1]
Other designations
Arp 269, UGC 7651, PGC 41333[1]

It was discovered by William Herschel in 1788. Two supernovae have been observed in NGC 4490, SN 1982F, and type II-P SN 2008ax, with peak magnitude 13.0.[3][4]

  • Extreme tidal forces have carved out the shapes and properties of NGC 4490.[5]

See also

References
  1. "NASA/IPAC Extragalactic Database". Results for NGC 4490. Retrieved 2016-01-18.
  2. Craig Crossen, Gerald Rhemann (2012). Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes. Springer Science+Business Media. p. 233. ISBN 978-3-7091-0626-6.
  3. List of Supernovae IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
  4. David Bishop. "Supernova 2008ax in NGC 4490". supernovae.net (International Supernovae Network). Archived from the original on 8 April 2010. Retrieved 7 June 2010.
  5. "Bursting with Starbirth". www.spacetelescope.org. Retrieved 28 September 2017.


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