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NGC 6221
NGC 6221 as seen through the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Ara
Right ascension	16 52 46.1
Declination	−59° 13′ 07″
Redshift	0.004999±0.000017
Heliocentric radial velocity	1499±5 km/s
Galactocentric velocity	1390±7 km/s
Apparent magnitude (V)	9.28
Absolute magnitude (V)	−20.97
Characteristics
Type	SB(s)bc
Size	70,000 light years
Apparent size (V)	3.5′ × 2.5′
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 and was discovered by British astronomer John Herschel on 3 May 1835. NGC 6221 is located at about 69 million light years from Earth.

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.

Supernovae

Two supernovae have been observed in NGC 6221:

• SN 1990W (type Ib/Ic, mag. 15) was discovered by Robert Evans on 16 August 1990.
• SN 2024pxg (type II, mag. 15.1) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 23 July 2024.

See also

• List of NGC objects (6001–7000)
• New General Catalogue

References

1. ^ "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. 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.
5. Evans, R.; Sadler, E.; McNaught, R. H. (1990). "Supernova 1990W in NGC 6221". International Astronomical Union Circular (5076): 1. Bibcode:1990IAUC.5076....1E.
6. "SN 1990W". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-19.
7. "SN 1990W". Transient Name Server. IAU. Retrieved 6 December 2024.
8. "SN 2024pxg". Transient Name Server. IAU. Retrieved 6 December 2024.

External links

• Media related to NGC 6221 at Wikimedia Commons

v t e Constellation of Ara
Ara in Chinese astronomy List of stars in Ara
Stars	Bayer α (Choo/Tchou) β γ δ ε ε ζ (Tseen Yin) η θ ι κ λ μ (Cervantes) ν (V539) ν π ρ ρ σ Variable R S OY V626 V821 V828 V829 V854 V862 V872 HR 6177 6187 6207 6236 6251 6253 6297 6300 6312 6323 6408 6416 (41 G.) 6423 6438 6477 6478 6483 6487 6513 6759 HD 152079 153201 154672 154857 156411 (Inquill) Other 2MASS J18082002−5104378 CXOU J164710.2−455216 Gliese 674 Gliese 676 IRAS 16594-4656 SAO 244567 SGR 1627−41 Westerlund 1-20 Westerlund 1 W26 Westerlund 1-75 Westerlund 1-237 Westerlund 1-243 XTE J1650−500
Exoplanets Gliese 674 b HD 154672 b HD 154857 b c HD 156411 b μ Arae b c d e
Star clusters	NGC 6193 6200 6204 6208 6250 6352 6362 6397 Other ESO 280-SC06 IC 4651 Westerlund 1
Nebulae	NGC 6188 6326 Other Stingray Nebula Water Lily Nebula
Galaxies	NGC 6215 6221 6300 6328
Category

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• Ara (constellation)
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