NGC 2573

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NGC 2573
NGC 2573 DSS.jpg
NGC 2573
Observation data (J2000.0 epoch)
Constellation Octans
Right ascension 01h 41m 38.0019s [1]
Declination −89° 20′ 04.2723″ [1]
Redshift 0.008102±0.000017 [2]
Heliocentric radial velocity 2,429±5  km/s [2]
Distance 25.8 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
Type SAB(s)cd: [5]
Mass 3.229×1011 [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]

Contents

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

Related Research Articles

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<span class="mw-page-title-main">NGC 7314</span> Galaxy in the constellation Piscis Austrinus

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<span class="mw-page-title-main">NGC 6902</span> Unbarred spiral galaxy in the constellation Sagittarius

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<span class="mw-page-title-main">NGC 4800</span> Galaxy in constellation Canes Venatici

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<span class="mw-page-title-main">NGC 834</span> Spiral galaxy in the constellation Andromeda

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<span class="mw-page-title-main">NGC 605</span> Galaxy in the constellation Andromeda

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<span class="mw-page-title-main">NGC 959</span> Spiral galaxy in the northern constellation of Triangulum

NGC 959 is a spiral galaxy in the northern constellation of Triangulum. It was discovered on 9 November 1876 by French astronomer Édouard Stephan. This galaxy is located at a distance of 36 million light years and is receding with a heliocentric radial velocity of 596 km/s. It is a member of the NGC 1023 Group of galaxies.

<span class="mw-page-title-main">NGC 4324</span> Galaxy in the constellation of Virgo

NGC 4324 is a lenticular galaxy located about 85 million light-years away in the constellation Virgo. It was discovered by astronomer Heinrich d'Arrest on March 4, 1862. NGC 4324 has a stellar mass of 5.62 × 1010M☉, and a baryonic mass of 5.88 × 1010M☉. The galaxy's total mass is around 5.25 × 1011M☉. NGC 4324 is notable for having a ring of star formation surrounding its nucleus. It was considered a member of the Virgo II Groups until 1999, when its distance was recalculated and it was placed in the Virgo W Group.

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References

  1. 1 2 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. 1 2 3 4 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. 1 2 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. 1 2 3 4 Lauberts, Andris; Valentijn, Edwin A. (1989). The surface photometry catalogue of the ESO-Uppsala galaxies. Garching: European Southern Observatory.
  5. 1 2 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. 1 2 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. 1 2 "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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