Astronomy:NGC 24

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Short description: Galaxy in the constellation Sculptor
NGC 24
NGC 24
HST image of NGC 24
Observation data (J2000 epoch)
ConstellationSculptor
Right ascension 00h 09m 56.542s[1]
Declination−24° 57′ 47.27″[1]
Redshift0.00185±0.00001[2]
Helio radial velocity554.017±2.099 km/s[2]
Distance23.8 Mly (7.31 Mpc)[3]
Apparent magnitude (V)12.4[4]
Absolute magnitude (V)−17.61
Characteristics
TypeSA(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 more than three times as distant. It may form a pair with another background galaxy, NGC 45.[8]

References

  1. ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S. 
  2. ↑ 2.0 2.1 Koribalski, B. S. et al. (July 2004). "The 1000 Brightest HIPASS Galaxies: H I Properties". The Astronomical Journal 128 (1): 16–46. doi:10.1086/421744. Bibcode: 2004AJ....128...16K. 
  3. ↑ 3.0 3.1 Karachentsev, Igor D. et al. (January 2017). "The Local Tully-Fisher Relation for Dwarf Galaxies". The Astronomical Journal 153 (1): 17. doi:10.3847/1538-3881/153/1/6. 6. Bibcode: 2017AJ....153....6K. 
  4. ↑ 4.0 4.1 "NASA/IPAC Extragalactic Database". Results for NGC 0024. http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=NGC+24&img_stamp=yes&extend=no. 
  5. ↑ 5.0 5.1 de Vaucouleurs, G. et al. (1991). Third reference catalogue of bright galaxies. New York: Springer-Verlag. 
  6. ↑ "NGC 24". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+24. 
  7. ↑ "The hidden dark side of NGC 24". http://www.spacetelescope.org/images/potw1639a/. 
  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. doi:10.1086/508859. Bibcode: 2006AJ....132.2527C. 

External links



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