NGC 4490

NGC 4490, also known as the Cocoon Galaxy, is a barred spiral galaxy in the constellation Canes Venatici. William Herschel discovered it in 1788. The galaxy 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 the Herschel 400 Catalogue. It belongs in Canes Venatici galaxy cloud II.

NGC 4490
NGC 4490 and satellite galaxy, NGC 4485
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]

Two supernovae have been observed in NGC 4490: SN 1982F (type unknown, mag. 16),[3] and SN 2008ax (type II, mag 13).[4][5]

  • Extreme tidal forces have carved out the shapes and properties of NGC 4490.
    Extreme tidal forces have carved out the shapes and properties of NGC 4490.[6]

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. Transient Name Server entry for SN 1982F. Retrieved 29 March 2023.
  4. List of Supernovae IAU Central Bureau for Astronomical Telegrams. Retrieved 29 December 2015.
  5. David Bishop. "Supernova 2008ax in NGC 4490". supernovae.net (International Supernovae Network). Archived from the original on 8 April 2010. Retrieved 7 June 2010.
  6. "Bursting with Starbirth". www.spacetelescope.org. Retrieved 28 September 2017.
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