Astronomy:NGC 6221
| NGC 6221 | |
|---|---|
 NGC 6221 as seen through the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Ara |
| Right ascension | 16h 52m 46.1s[1] |
| Declination | −59° 13′ 07″[1] |
| Redshift | 0.004999±0.000017[1] |
| Helio radial velocity | 1499±5 km/s[1] |
| Galactocentric velocity | 1390±7 km/s[1] |
| Apparent magnitude (V) | 9.28[1] |
| Absolute magnitude (V) | −20.97[1] |
| Characteristics | |
| Type | SB(s)bc[1] |
| Size | 70,000 light years |
| Apparent size (V) | 3.5′ × 2.5′[1] |
| Other designations | |
| ESO 138-3, AM 1648-590, IRAS16484-5908 and PGC 59175 | |
References: NASA/IPAC extragalactic datatbase, http://spider.seds.org/ | |
NGC 6221 (also known as PGC 59175) is a barred spiral galaxy located in the constellation Ara. In de Vaucouleurs' galaxy morphological classification scheme, it is classified as SB(s)bc[1] and was discovered by British astronomer John Herschel on 3 May 1835.[2] NGC 6221 is located at about 69 million light years from Earth.[1][3]
In 1990, a type Ib/Ic supernova was detected within NGC 6221, and was designated SN 1990W.[4]
Galaxy group information
NGC 6221 is part of galaxy group NGC 6221/15, which includes spiral galaxy NGC 6215 and three dwarf galaxies. Interactions between NGC 6221 and NGC 6215 form a double-stranded bridge of neutral hydrogen gas over a projected distance of 100 kpc; Dwarf 3 of the three dwarf galaxies may have formed from the bridging gas.[5]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Object No. 1 - NGC 6221". NASA/IPAC. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+6221&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ "NGC 6221 (= PGC 59175)". http://cseligman.com/text/atlas/ngc62.htm#6221.
- ↑ "Revised NGC Data for NGC 6221". http://spider.seds.org/ngc/revngcic.cgi?NGC6221.
- ↑ "SN 1990W". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=SN+1990W.
- ↑ Koribalski, Bärbel; Dickey, John M. (2005). "Neutral Hydrogen Gas in Interacting Galaxies: The NGC 6221 / 6215 galaxy group". Monthly Notices of the Royal Astronomical Society 348 (4): 202–210. doi:10.1111/j.1365-2966.2004.07444.x. Bibcode: 2004MNRAS.348.1255K. http://www.atnf.csiro.au/people/bkoribal/ngc6221/. Retrieved 17 December 2015.
External links
Coordinates: 
16h 52m 46.1s, +-59° 13′ 07″
 |  |
