NGC 55

NGC 55
Irregular Galaxy NGC 55 imaged by the La Silla Observatory
Observation data (J2000 epoch)
ConstellationSculptor[1]
Right ascension00h 14m 53.6s[2]
Declination−39° 11′ 47.9″[2]
Redshift0.000437[2]
Heliocentric radial velocity131 ± 2 km/s[2]
Distance6.5 ± 0.65 Mly
(2.00 ± 0.2 Mpc)[3][4] [a]
Apparent magnitude (V)7.87[5][6]
Characteristics
TypeSB(s)m[2]
Mass(2.0 ± 0.4) × 1010 M☉
Size~68,500 ly (20.99 kpc) (estimated)[2]
Apparent size (V)32.4′ × 5.6′[2]
Other designations
PGC 1014,[2] Caldwell 72, 2MASS J00145360-3911478, IRAS F00124-3929, ESO 293-50, MCG -07-01-013[5]

NGC 55, also known as the String of Pearls Galaxy,[7] is a Magellanic type barred spiral galaxy located about 6.5 million light-years away in the constellation Sculptor. It was discovered on 7 July 1826 by Scottish astronomer James Dunlop.[8] Along with its neighbor NGC 300, it is one of the closest galaxies to the Local Group, probably lying between the Milky Way and the Sculptor Group.[8] It has an estimated mass of (2.0 ± 0.4) × 1010 M☉.[9]

  1. ^ R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 978-0-933346-51-2.
  2. ^ a b c d e f g h "NASA/IPAC Extragalactic Database". Results for NGC 55. Retrieved 2006-10-17.
  3. ^ Cite error: The named reference Karachentsevetal2006 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference vandesteeneetal2006 was invoked but never defined (see the help page).
  5. ^ a b "NGC 55". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-11-29.
  6. ^ Armando, Gil de Paz; et al. (2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". Astrophysical Journal Supplement Series. 173 (2): 185–255. arXiv:astro-ph/0606440. Bibcode:2007ApJS..173..185G. doi:10.1086/516636. S2CID 119085482.
  7. ^ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
  8. ^ a b "New General Catalog Objects: NGC 50 - 99". cseligman.com. Retrieved 2017-12-12.
  9. ^ Westmeier, T.; Koribalski, B. S.; Braun, R. (2013). "Gas and dark matter in the Sculptor group: NGC 55". Monthly Notices of the Royal Astronomical Society. 434 (4): 3511–3525. arXiv:1307.2962. doi:10.1093/mnras/stt1271.