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) | |
| Constellation | Phoenix |
| Right ascension | 01h 38m 52.975s[1] |
| Declination | −42° 35′ 07.19″[1] |
| Redshift | 0.020731[2] |
| Helio 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] | |
See also
References
- 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.
- "NGC 644". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-20.
- 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.
- "Results for object NGC 0644 (NGC 644)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2020-05-20.
- Ford, Dominic. "The galaxy NGC 644 - In-The-Sky.org". in-the-sky.org. Retrieved 2020-04-03.
- "Revised NGC Data for NGC 644". spider.seds.org. Retrieved 2020-04-03.
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