NGC 2573

NGC 2573
NGC 2573
Observation data (J2000.0 epoch)
ConstellationOctans
Right ascension01h 41m 38.0019s[1]
Declination−89° 20′ 04.2723″[1]
Redshift0.008102±0.000017[2]
Heliocentric radial velocity2,429±5 km/s[2]
Distance25.8 megaparsecs (84 Mly)[3]
Apparent magnitude (V)13.25±0.09[4]
Apparent magnitude (B)14.15±0.09[4]
Absolute magnitude (V)−19.30±0.67[4]
Characteristics
TypeSAB(s)cd:[5]
Mass3.229×1011[6] M☉
Size23,860 parsecs (77,800 ly)
Apparent size (V)0.85′ × 0.34′[7]
Notable featuresClosest NGC object to the south celestial pole.
Other designations
Polarissima Australis,NGC 2573, PGC 6249

NGC 2573, also known as Polarissima Australis,[8] is a barred spiral galaxy located in the constellation Octans. It has an apparent magnitude of 13.25,[4] making it readily visible in medium-sized telescopes, but not to the naked eye. The object is located relatively far at a distance of 84 million light years[3] and it is currently receding with a heliocentric radial velocity of 2495 km/s.[2] Using a redshift of z = 0.08102 yields a greater distance of 109 million light years.[2]

The galaxy was discovered on March 29th, 1837 by English astronomer John Herschel.[9] It is the closest NGC object to the south celestial pole, hence the nickname "Polarissima Australis".[8]

In the De Vaucouleurs system, NGC 2573 has a morphological classification of SAB(s)cd:,[5] indicating that it is a weakly-barred spiral galaxy with loosely bound spiral arms and a small, faint bulge. The (s) notation indicates that the galaxy has a purely spiral structure. There is uncertainty about the classification, possibly due to NGC 2573's faintness. NGC 2573 is estimated to be 77,800 light years across, making it similar in size to the Milky Way. Alternatively, it has a central mass of 3.229×1011 M☉,[6] which is 28% of the latter's mass.

See also

  • NGC 3172 - the closest NGC object to the north celestial pole.

References

  1. ^ a b Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d di Nella, H.; Paturel, G.; Walsh, A. J.; Bottinelli, L.; Gouguenheim, L.; Theureau, G. (August 1996). "Kinematics of the local universe. III. Neutral hydrogen observations of southern galaxies". Astronomy and Astrophysics Supplement Series. 118: 311–321. Bibcode:1996A&AS..118..311D. ISSN 0365-0138.
  3. ^ a b Sorce, J. G.; Tully, R. B.; Courtois, H. M.; Jarrett, T. H.; Neill, J. D.; Shaya, E. J. (August 18, 2014). "From Spitzer Galaxy photometry to Tully–Fisher distances". Monthly Notices of the Royal Astronomical Society. 444 (1): 527–541. arXiv:1408.0729. Bibcode:2014MNRAS.444..527S. doi:10.1093/mnras/stu1450. ISSN 0035-8711. S2CID 118479670.
  4. ^ a b c d Lauberts, Andris; Valentijn, Edwin A. (1989). The surface photometry catalogue of the ESO-Uppsala galaxies. Garching: European Southern Observatory.
  5. ^ a b de Vaucouleurs, G.; de Vaucouleurs, A.; Corwin, H. G.; Buta, R. J.; Paturel, G.; Fouque, P. (December 1991). "Book-Review - Third Reference Catalogue of Bright Galaxies". Sky and Telescope. 82: 621. Bibcode:1991S&T....82Q.621D. ISSN 0037-6604.
  6. ^ a b Kourkchi, Ehsan; Tully, R. Brent (July 1, 2017). "Galaxy Groups Within 3500 km s −1". The Astrophysical Journal. 843 (1): 16. arXiv:1705.08068. Bibcode:2017ApJ...843...16K. doi:10.3847/1538-4357/aa76db. ISSN 0004-637X. S2CID 119407480.
  7. ^ Skrutskie, M. F.; Cutri, R. M.; Stiening, R.; Weinberg, M. D.; Schneider, S.; Carpenter, J. M.; Beichman, C.; Capps, R.; Chester, T.; Elias, J.; Huchra, J.; Liebert, J.; Lonsdale, C.; Monet, D. G.; Price, S.; Seitzer, P.; Jarrett, T.; Kirkpatrick, J. D.; Gizis, J. E.; Howard, E.; Evans, T.; Fowler, J.; Fullmer, L.; Hurt, R.; Light, R.; Kopan, E. L.; Marsh, K. A.; McCallon, H. L.; Tam, R.; Van Dyk, S.; Wheelock, S. (February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. eISSN 1538-3881. ISSN 0004-6256.
  8. ^ a b "NGC 2573". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-29.
  9. ^ "New General Catalog Objects: NGC 2550 - 2599". cseligman.com. Retrieved 2020-05-30.

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