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
DECam image of NGC 644
Observation data (J2000 epoch)
Constellation	Phoenix
Right ascension	01h 38m 52.975s[1]
Declination	−42° 35′ 07.19″[1]
Redshift	0.020731[2]
Heliocentric radial velocity	6151 km/s[2]
Distance	268.8 Mly (82.41 Mpc)[3]
Apparent magnitude (B)	14.79[2]
Characteristics
Type	SB(r)bc:[4]
Size	126.8 kly (38.88 kpc)[4]
Other designations
MCG -07-04-027, PGC 6097[2]

Two supernovae 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

• List of NGC objects (1–1000)

References

1. Skrutskie, 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. "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. S2CID 250737862. 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.
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

• Media related to NGC 644 at Wikimedia Commons