NGC 644

NGC 644 is a barred spiral galaxy in the constellation Phoenix in the southern sky. It is estimated to be 270 million light-years from the Milky Way and has a diameter of approximately 130,000 light-years.[4] Together with NGC 641, it probably forms a gravitationally bound pair of galaxies. The object was discovered on September 5, 1834 by John Herschel.[5][6]

NGC 644
SDSS image of NGC 644
Observation data (J2000 epoch)
ConstellationPhoenix
Right ascension 01h 38m 52.975s[1]
Declination−42° 35′ 07.19″[1]
Redshift0.020731[2]
Helio 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]

See also

References
  1. Skrutskie, M.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.
  2. "NGC 644". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-20.
  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. 50.
  4. "Results for object NGC 0644 (NGC 644)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2020-05-20.
  5. Ford, Dominic. "The galaxy NGC 644 - In-The-Sky.org". in-the-sky.org. Retrieved 2020-04-03.
  6. "Revised NGC Data for NGC 644". spider.seds.org. Retrieved 2020-04-03.
  • Media related to NGC 644 at Wikimedia Commons


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