NGC 6221 (also known as PGC 59175) is a barred spiral galaxy located in the constellation Ara. It is designated as SB(s)bc in the galaxy morphological classification scheme and was discovered by British astronomer John Herschel on 3 May 1835. NGC 6221 is located at about 69 million light years from earth.
NGC 6221 as seen through the Hubble Space Telescope
|Observation data (J2000 epoch)|
|Right ascension||16h 52m 46.1s|
|Declination||−59° 13′ 07″|
|Helio radial velocity||1499±5 km/s|
|Galactocentric velocity||1390±7 km/s|
|Apparent magnitude (V)||9.28|
|Absolute magnitude (V)||-21.01|
|Size||70,000 light years|
|Apparent size (V)||3.50′ × 2.5′|
|ESO 138-3, AM 1648-590, IRAS16484-5908 and PGC 59175|
References: NASA/IPAC extragalactic datatbase, http://spider.seds.org/
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.