Astronomy:NGC 644
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| 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] |
| 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] | |
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 by British astronomer John Herschel on 5 September 1834.[5][6]
Supernovae
Two supernovae have been observed in NGC 644:
- SN 2011gm (Type Ia, mag. 15.8) was discovered by Stuart Parker on 21 September 2011.[7][8].
- SN 2018cmj (Type II, mag. 17.1) was discovered by ASAS-SN on 13 June 2018.[9]
See also
References
- ↑ 1.0 1.1 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W. et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal 131 (2): 1163–1183. doi:10.1086/498708. ISSN 0004-6256. Bibcode: 2006AJ....131.1163S.
- ↑ 2.0 2.1 2.2 2.3 "NGC 644". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+644.
- ↑ Tully, R. Brent; Courtois, Hélène M.; Sorce, Jenny G. (2016). "Cosmicflows-3". The Astronomical Journal 152 (2): 21. doi:10.3847/0004-6256/152/2/50. 50. Bibcode: 2016AJ....152...50T.
- ↑ 4.0 4.1 4.2 "Results for object NGC 0644 (NGC 644)". NASA/IPAC Extragalactic Database. California Institute of Technology. https://ned.ipac.caltech.edu/byname?objname=NGC%20644&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1.
- ↑ Ford, Dominic. "The galaxy NGC 644 - In-The-Sky.org" (in en). https://in-the-sky.org/data/object.php?id=NGC644.
- ↑ "Revised NGC Data for NGC 644". http://spider.seds.org/ngc/revngcic.cgi?NGC%20644.
- ↑ Jacques, C.; Pimentel, E.; Milisavljevic, D.; Fesen, R.; Pickering, T.; Gulbis, A. (2011). "Supernova 2011gm in NGC 644 = PSN J01385459-4235088". Central Bureau Electronic Telegrams (2847): 1. Bibcode: 2011CBET.2847....1J. http://www.cbat.eps.harvard.edu/iau/cbet/002800/CBET002847.txt.
- ↑ "SN 2011gm". IAU. https://www.wis-tns.org/object/2011gm.
- ↑ "SN 2018cmj". IAU. https://www.wis-tns.org/object/2018cmj.
External links
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