NGC 2939

NGC 2939
NGC 2939 imaged by Legacy Surveys
Observation data (J2000 epoch)
ConstellationLeo (constellation)
Right ascension09h 38m 08.0700s
Declination+09° 31′ 17.500″
Redshift0.011138±0.00000500
Heliocentric radial velocity3,339±1 km/s
Distance149.30 ± 5.20 Mly (45.777 ± 1.594 Mpc)
Group or clusterNGC 2911 group (LGG 177)
Apparent magnitude (V)13.15
Characteristics
TypeSbc
Size~112,900 ly (34.62 kpc) (estimated)
Apparent size (V)2.6′ × 0.7′
Other designations
IRAS 09354+0945, 2MASX J09380786+0931258, UGC 5134, MCG +04-23-018, PGC 27451, CGCG 063-022

NGC 2939 is a spiral galaxy in the constellation of Leo. Its velocity with respect to the cosmic microwave background is 3,665±23 km/s, which corresponds to a Hubble distance of 176.3 ± 12.4 Mly (54.05 ± 3.80 Mpc). However, 13 non-redshift measurements give a closer mean distance of 149.30 ± 5.20 Mly (45.777 ± 1.594 Mpc). It was discovered by German-British astronomer William Herschel on 18 January 1784.

NGC 2939 is a radio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.

NGC 2911 group

NGC 2939 is a member of the NGC 2911 group (also known as LGG 177). This group contains 7 galaxies, including NGC 2911, NGC 2913 [fr], NGC 2914 [fr], UGC 5189 [d], UGC 5216 [d], and PGC 27167.

Supernovae

Two supernovae have been observed in NGC 2939:

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 "Results for object NGC 2939". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 18 June 2026.
  2. 1 2 "Distance Results for NGC 2939". NASA/IPAC Extragalactic Database. NASA. Retrieved 18 June 2026.
  3. ↑ Herschel, William (1786). "Catalogue of One Thousand New Nebulae and Clusters of Stars" (PDF). Philosophical Transactions of the Royal Society of London. 76: 457–499. Bibcode:1786RSPT...76..457H. doi:10.1098/rstl.1786.0027.
  4. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 2939". Celestial Atlas. Retrieved 18 June 2026.
  5. ↑ Best, P. N.; Heckman, T. M. (2012). "On the fundamental dichotomy in the local radio-AGN population: Accretion, evolution and host galaxy properties". Monthly Notices of the Royal Astronomical Society. 421 (2): 1569. arXiv:1201.2397. Bibcode:2012MNRAS.421.1569B. doi:10.1111/j.1365-2966.2012.20414.x.
  6. ↑ "NGC 2939". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 June 2026.
  7. ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series. 100: 47. Bibcode:1993A&AS..100...47G.
  8. ↑ "LGG 177". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 June 2026.
  9. ↑ Pignata, G.; Maza, J.; Hamuy, M.; Antezana, R.; Gonzalez, L.; Gonzalez, P.; Lopez, P.; Silva, S.; Folatelli, G.; Iturra, D.; Cartier, R.; Forster, F.; Marchi, S.; Conuel, B.; Reichart, D.; Ivarsen, K.; Crain, A.; Foster, D.; Nysewander, M.; Lacluyze, A. (2009). "Supernova 2009ao in NGC 2939". Central Bureau Electronic Telegrams (1711): 1. Bibcode:2009CBET.1711....1P.
  10. ↑ "SN 2009ao". Transient Name Server. IAU. Retrieved 18 June 2026.
  11. ↑ Kandrashoff, M.; Lin, K.; Cenko, S. B.; Li, W.; Filippenko, A. V.; Silverman, J. M.; Canalizo, G.; Hiner, K.; Lazarova, M. (2011). "Supernova 2011cf in NGC 2939 = PSN J09380828+0931111". Central Bureau Electronic Telegrams (2716): 1. Bibcode:2011CBET.2716....1K.
  12. ↑ "SN 2011cf". Transient Name Server. IAU. Retrieved 18 June 2026.