NGC 6221
| NGC6221 | |
|---|---|
 NGC 6221 as seen through theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Constellation | Ara |
| Right ascension | 16h52m46.1s[1] |
| Declination | −59° 13′ 07″[1] |
| Redshift | 0.004999±0.000017[1] |
| Heliocentric 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 | 70,000light years |
| Apparent size(V) | 3.5′× 2.5′[1] |
| Other designations | |
| ESO138-3, AM 1648-590,IRAS16484-5908 andPGC59175 | |
References:NASA/IPAC extragalactic datatbase,http://spider.seds.org/ | |
NGC 6221(also known asPGC59175) is abarred spiral galaxylocated in the constellationAra.In de Vaucouleurs'galaxy morphological classification scheme,it is classified as SB(s)bc[1]and was discovered by British astronomerJohn Herschelon 3 May 1835.[2]NGC 6221 is located at about 69 millionlight yearsfrom Earth.[1][3]
In 1990, atype Ib/Icsupernovawas detected within NGC 6221, and was designated SN 1990W.[4]
Galaxy group information
[edit]NGC 6221 is part ofgalaxy groupNGC 6221/15, which includesspiral galaxyNGC 6215and threedwarf galaxies.Interactions between NGC 6221 and NGC 6215 form adouble-stranded bridgeofneutral hydrogen gasover a projected distance of 100kpc;Dwarf 3 of the three dwarf galaxies may have formed from the bridging gas.[5]
See also
[edit]References
[edit]- ^abcdefghijk"Object No. 1 - NGC 6221".NASA/IPAC extragalactic database.NASA/IPAC.Retrieved3 October2015.
- ^"NGC 6221 (= PGC 59175)".cseligman.Retrieved3 October2015.
- ^"Revised NGC Data for NGC 6221".Seds.Retrieved3 October2015.
- ^"SN 1990W".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2021-03-19.
- ^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.arXiv:astro-ph/0501190.Bibcode:2004MNRAS.348.1255K.doi:10.1111/j.1365-2966.2004.07444.x.Retrieved17 December2015.
External links
[edit]
Media related toNGC 6221at Wikimedia Commons
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