NGC 4242

Source: Wikipedia, the free encyclopedia.
NGC 4242
J2000 epoch)
ConstellationCanes Venatici
Right ascension12h 17m 30.174s[1]
Declination+45° 37′ 09.46″[1]
Redshift0.00176[1]
Heliocentric radial velocity527 km/s[1]
Distance17.78 ± 0.65 Mly (5.45 ± 0.20 Mpc)[2]
Group or clusterCanes II Group
Apparent magnitude (V)11.37[3]
Apparent magnitude (B)10.83[3]
Characteristics
TypeSABdm[4]
Apparent size (V)5.0′ × 0.38′[3]
Other designations
NGC 4242, UGC 7323, MCG +08-22-098, PGC 39423[5]

NGC 4242 is a

megaparsecs) away.[2] It was discovered on 10 April 1788 by William Herschel,[7] and it was described as "very faint, considerably large, irregular, round, very gradually brighter in the middle, resolvable" by John Louis Emil Dreyer, the compiler of the New General Catalogue.[8]

NGC 4242's

galaxy morphological type is SABdm. This means that it is an intermediate spiral galaxy, with loosely wound spiral arms and is generally irregular in appearance. It was photographed by the Hubble Space Telescope in 2017.[9] The image shows an asymmetric center and a small galactic bar.[9] NGC 4242 has a relatively low surface brightness and rate of star formation.[9] NGC 4242 may be a satellite galaxy of Messier 106[10] and is a member of the Canes II Group.[11][12]

SN 2002bu was detected in NGC 4242, brightening to its peak magnitude of 15.5 in 2002.[13] It was originally classified as a type II supernova.[13] In 2011, it was thought to be a supernova impostor like SN 2008S,[14] and in 2021 researchers reclassified it as a gap transient.[15][16]

References

  1. ^
    Bibcode:2009yCat.2294....0A
    .
  2. ^
    S2CID 118494842
    .
  3. ^
    S2CID 119085482
    .
  4. S2CID 119253507
    .
  5. ^ "NGC 4242". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 April 2018.
  6. S2CID 119190619
    .
  7. ^ Seligman, Courtney. "New General Catalogue objects: NGC 4200 - 4249". cseligman.com. Retrieved 10 April 2018.
  8. ^ "Revised NGC Data for NGC 4242 - Hartmut Frommert - SEDS". seds.org. Retrieved 14 April 2018.
  9. ^ a b c "Dim and diffuse | ESA/Hubble". www.spacetelescope.org. 2017. Retrieved 14 March 2018.
  10. S2CID 118622457
    .
  11. Bibcode:1992A&AS...93..211F
    .
  12. ^ "The Canes II Group". www.atlasoftheuniverse.com. Retrieved 2018-04-16.
  13. ^ a b "SN 2002bu". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 April 2018.
  14. S2CID 85440811
    .
  15. doi:10.1093/mnras/stab1938
    .
  16. ^ "SN 2002bu". Transient Name Server. IAU. Retrieved 31 August 2024.
  • Media related to NGC 4242 at Wikimedia Commons
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