Astronomy:NGC 6221

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Galaxy in the constellation Ara
NGC 6221
NGC 6221 hst 05479 606.png
NGC 6221 as seen through the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationAra
Right ascension 16h 52m 46.1s[1]
Declination−59° 13′ 07″[1]
Redshift0.004999±0.000017[1]
Helio radial velocity1499±5 km/s[1]
Galactocentric velocity1390±7 km/s[1]
Apparent magnitude (V)9.28[1]
Absolute magnitude (V)−20.97[1]
Characteristics
TypeSB(s)bc[1]
Size70,000 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

External links

Coordinates: Sky map 16h 52m 46.1s, +-59° 13′ 07″