NGC 24

NGC 24 is a spiral galaxy in the southern constellation of Sculptor, about 23.8 megalight-years distant from the Milky Way.[4] It was discovered by British astronomer William Herschel in 1785, and measures some 40,000 light-years across.[1] The general shape of this galaxy is specified by its morphological classification of SA(s)c,[6] 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
Observation data (J2000 epoch)
ConstellationSculptor
Right ascension 00h 09m 56.542s[2]
Declination−24° 57′ 47.27″[2]
Redshift0.00185±0.00001[3]
Helio radial velocity554.017±2.099 km/s[3]
Distance23.8 Mly (7.31 Mpc)[4]
Apparent magnitude (V)12.4[5]
Absolute magnitude (V)−17.61
Characteristics
TypeSA(s)c[6]
Apparent size (V)5.7' x 1.5'
Other designations
UGCA 2, ESO 472-G016, MCG-04-01-018, ESO-LV 4720160,[7] PGC 701, CGS 119[5]

References
  1. "The hidden dark side of NGC 24". www.spacetelescope.org. Retrieved 26 September 2016.
  2. Skrutskie, M. F.; et al. (February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.
  3. 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.
  4. 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. 6.
  5. "NASA/IPAC Extragalactic Database". Results for NGC 0024. Retrieved 2010-05-04.
  6. de Vaucouleurs, G.; et al. (1991). Third reference catalogue of bright galaxies. 9. New York: Springer-Verlag.
  7. "NGC 24". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 January 2017.
  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.
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