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NGC 644

From Wikipedia, the free encyclopedia
Galaxy in the constellation of Phoenix
NGC 644
DECam image of NGC 644
Observation data (J2000epoch)
ConstellationPhoenix
Right ascension01h 38m 52.975s[1]
Declination−42° 35′ 07.19″[1]
Redshift0.020731[2]
Heliocentric radial velocity6151 km/s[2]
Distance268.8 Mly (82.41 Mpc)[3]
Apparent magnitude (B)14.79[2]
Characteristics
TypeSB(r)bc:[4]
Size126.8 kly (38.88 kpc)[4]
Other designations
MCG -07-04-027,PGC 6097[2]

NGC 644 is abarred spiral galaxy in theconstellationPhoenix in the southern sky. It is estimated to be 270 millionlight-years from theMilky Way and has adiameter of approximately 130,000 light-years.[4] Together with NGC 641, it probably forms agravitationally bound pair of galaxies. The object was discovered on September 5, 1834 byJohn Herschel.[5][6]

Twosupernovae have been observed in NGC 644: SN 2011gm (type Ia, mag. 15.8),[7] and SN 2018cmj (type II, mag. 17.1).[8]

See also

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References

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  1. ^abSkrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (1 February 2006)."The Two Micron All Sky Survey (2MASS)".The Astronomical Journal.131 (2):1163–1183.Bibcode:2006AJ....131.1163S.doi:10.1086/498708.ISSN 0004-6256.S2CID 18913331.
  2. ^abcd"NGC 644".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2020-05-20.
  3. ^Tully, R. Brent; Courtois, Hélène M.; Sorce, Jenny G. (2016)."Cosmicflows-3".The Astronomical Journal.152 (2): 21.arXiv:1605.01765.Bibcode:2016AJ....152...50T.doi:10.3847/0004-6256/152/2/50.S2CID 250737862. 50.
  4. ^abc"Results for object NGC 0644 (NGC 644)".NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved2020-05-20.
  5. ^Ford, Dominic."The galaxy NGC 644 - In-The-Sky.org".in-the-sky.org. Retrieved2020-04-03.
  6. ^"Revised NGC Data for NGC 644".spider.seds.org. Retrieved2020-04-03.
  7. ^Transient Name Server entry for SN 2011gm. Retrieved 24 March 2023.
  8. ^Transient Name Server entry for SN 2018cmj. Retrieved 24 March 2023.

External links

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  • Media related toNGC 644 at Wikimedia Commons


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