NGC 644

Galaxy in the constellation of Phoenix

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]

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]

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

[edit]

* List of NGC objects (1–1000)

## References

[edit]

1. ^ a b 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. ^ a b c d "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. ^ a b c "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

[edit]

* Media related to NGC 644 at Wikimedia Commons

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* Astronomical catalog
* List of NGC objects (1–1000)

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