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 more than three times as distant. It may form a pair with another background galaxy, NGC 45.[8]
| NGC 24 | |
|---|---|
 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] | |
References
edit- ^ a b 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.
- ^ a b 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.
- ^ a b 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.
- ^ a b "NASA/IPAC Extragalactic Database". Results for NGC 0024. Retrieved 2010-05-04.
- ^ a b de Vaucouleurs, G.; et al. (1991). Third reference catalogue of bright galaxies. 9. New York: Springer-Verlag.
- ^ "NGC 24". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.
- ^ "The hidden dark side of NGC 24". www.spacetelescope.org. Retrieved 26 September 2016.
- ^ 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.
External links
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Media related to NGC 24 at Wikimedia Commons- NGC 24 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
