| NGC 6221 | |
|---|---|
 NGC 6221 as seen through theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| Constellation | Ara |
| Right ascension | 16h 52m 46.1s[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 | |
| ESO 138-3, AM 1648-590,IRAS16484-5908 andPGC 59175 | |
References: NASA/IPAC extragalactic datatbase,http://spider.seds.org/ | |
NGC 6221 (also known asPGC 59175) is abarred spiral galaxy located in the constellationAra. In de Vaucouleurs'galaxy morphological classification scheme, it is classified as SB(s)bc[1] and was discovered by British astronomerJohn Herschel on 3 May 1835.[2] NGC 6221 is located at about 69 millionlight years from Earth.[1][3]
NGC 6221 is part ofgalaxy group NGC 6221/15, which includesspiral galaxyNGC 6215 and threedwarf galaxies. Interactions between NGC 6221 and NGC 6215 form adouble-stranded bridge ofneutral hydrogen gas over a projected distance of 100kpc; Dwarf 3 of the three dwarf galaxies may have formed from the bridging gas.[4]
Twosupernovae have been observed in NGC 6221:
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