NGC 24

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NGC 24
The hidden dark side of NGC 24.jpg
HST image of NGC 24
Observation data (J2000 epoch)
Constellation Sculptor
Right ascension 00h 09m 56.542s [1]
Declination −24° 57′ 47.27″ [1]
Redshift 0.00185±0.00001 [2]
Heliocentric radial velocity 554.017±2.099 km/s [2]
Distance 23.8  Mly (7.31  Mpc) [3]
Apparent magnitude  (V)12.4 [4]
Absolute magnitude  (V)−17.61
Characteristics
Type SA(s)c [5]
Apparent size  (V)5.7' x 1.5'
Other designations
UGCA 2, ESO 472-G016, MCG-04-01-018, ESO-LV 4720160, [6] PGC 701, CGS 119 [4]

NGC 24 is a spiral galaxy in the southern constellation of Sculptor, about 23.8 megalight-years distant from the Milky Way. [3] It was discovered by British astronomer William Herschel in 1785, and measures some 40,000 light-years across. [7] The general shape of this galaxy is specified by its morphological classification of SA(s)c, [5] which indicates it is an unbarred spiral with no ring-like structure and moderate to loosely-wound spiral arms. This galaxy is positioned in the vicinity of the Sculptor Group, but is actually a background object that is about two times as distant. It may form a pair with another background galaxy, NGC 45. [8]

References

  1. 1 2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi: 10.1086/498708 . ISSN   0004-6256. S2CID   18913331.
  2. 1 2 Koribalski, B. S.; et al. (July 2004). "The 1000 Brightest HIPASS Galaxies: H I Properties". The Astronomical Journal. 128 (1): 16–46. arXiv: astro-ph/0404436 . Bibcode:2004AJ....128...16K. doi:10.1086/421744. S2CID   16229767.
  3. 1 2 Karachentsev, Igor D.; et al. (January 2017). "The Local Tully-Fisher Relation for Dwarf Galaxies". The Astronomical Journal. 153 (1): 17. arXiv: 1611.02574 . Bibcode:2017AJ....153....6K. doi: 10.3847/1538-3881/153/1/6 . S2CID   119388974. 6.
  4. 1 2 "NASA/IPAC Extragalactic Database". Results for NGC 0024. Retrieved 2010-05-04.
  5. 1 2 de Vaucouleurs, G.; et al. (1991). Third reference catalogue of bright galaxies. 9. New York: Springer-Verlag.
  6. ↑ "NGC 24". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 16 January 2017.
  7. ↑ "The hidden dark side of NGC 24". www.spacetelescope.org. Retrieved 26 September 2016.
  8. ↑ Chemin, Laurent; et al. (December 2006). "H I Studies of the Sculptor Group Galaxies. VIII. The Background Galaxies: NGC 24 and NGC 45". The Astronomical Journal. 132 (6): 2527–2538. arXiv: astro-ph/0609148 . Bibcode:2006AJ....132.2527C. doi:10.1086/508859. S2CID   947116.
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