NGC 6221

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NGC 6221
NGC 6221 hst 05479 606.png
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]
Heliocentric radial velocity 1499±5 km/s [1]
Galactocentric velocity1390±7 km/s [1]
Apparent magnitude  (V)9.28 [1]
Absolute magnitude  (V)20.97 [1]
Characteristics
Type SB(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]

Contents

Two supernovae have been observed in NGC 6221: SN 1990W (type Ib/Ic, mag. 15), [4] [5] and SN 2024pxg (type II, mag. 15.1). [6]

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. [7]

See also

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References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Object No. 1 - NGC 6221". NASA/IPAC extragalactic database. NASA/IPAC. Retrieved 3 October 2015.
  2. "NGC 6221 (= PGC 59175)". cseligman. Retrieved 3 October 2015.
  3. "Revised NGC Data for NGC 6221". Seds. Retrieved 3 October 2015.
  4. "SN 1990W". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-03-19.
  5. Transient Name Server entry for SN 1990W. Retrieved 24 July 2024.
  6. Transient Name Server entry for SN 2024pxg. Retrieved 24 July 2024.
  7. 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 . Retrieved 17 December 2015.