NGC 6221

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]
Helio 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| 70,000 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

* 1 Galaxy group information
* 2 Supernovae
* 3 See also
* 4 References
* 5 External links

## 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.[4]

## 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.[5][6][7]
* SN 2024pxg (Type II, mag. 15.1) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 23 July 2024.[8]

## See also

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

## References

1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Object No. 1 - NGC 6221". NASA/IPAC. http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+6221&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
2. ↑ "NGC 6221 (= PGC 59175)". http://cseligman.com/text/atlas/ngc62.htm#6221.
3. ↑ "Revised NGC Data for NGC 6221". http://spider.seds.org/ngc/revngcic.cgi?NGC6221.
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. doi:10.1111/j.1365-2966.2004.07444.x. Bibcode: 2004MNRAS.348.1255K. http://www.atnf.csiro.au/people/bkoribal/ngc6221/. 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. http://www.cbat.eps.harvard.edu/iauc/05000/05076.html#item1.
6. ↑ "SN 1990W". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=SN+1990W.
7. ↑ "SN 1990W". IAU. https://www.wis-tns.org/object/1990W.
8. ↑ "SN 2024pxg". IAU. https://www.wis-tns.org/object/2024pxg.

## External links

* v
* t
* e

Astronomical catalogs

NGC|

* Astronomy:NGC 6216
* Astronomy:NGC 6217
* Astronomy:NGC 6218
* Astronomy:NGC 6219
* Astronomy:NGC 6220
* NGC 6221
* Astronomy:NGC 6222
* Astronomy:NGC 6223
* Astronomy:NGC 6224
* Astronomy:NGC 6225
* Astronomy:NGC 6226

PGC|

* Astronomy:PGC 59171
* Astronomy:PGC 59172
* Astronomy:PGC 59173
* Astronomy:PGC 59174
* PGC 59175
* Astronomy:PGC 59176
* Astronomy:PGC 59177
* Astronomy:PGC 59178
* Astronomy:PGC 59179

Template:NGC objects:6000-6499

* v
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Ara constellation

Stars
(list)|

| Bayer|

* α (Choo/Tchou)
* β
* γ
* δ
* ε1
* ε2
* ζ (Tseen Yin)
* η
* θ
* ι
* κ
* λ
* μ (Cervantes)
* ν2
* π
* ρ1
* ρ2
* σ

|

Variable|

* R
* S
* RW
* AE
* AT
* BF
* OY
* V535
* V539 (ν1)
* V626
* V750
* V824
* V828
* V829
* V854
* V862
* V872

HR|

* 6167
* 6177
* 6187
* 6188
* 6197
* 6207
* 6215
* 6219
* 6236
* 6251
* 6253
* 6275
* 6297
* 6300
* 6312
* 6320
* 6323
* 6356
* 6368
* 6408
* 6423
* 6438
* 6440
* 6442
* 6447
* 6471
* 6475
* 6477
* 6478
* 6483
* 6487
* 6505
* 6513
* 6525
* 6530
* 6547
* 6572
* 6614
* 6640
* 6759

HD|

* 150897
* 152079
* 152220
* 153201
* 154672
* 154857
* 155951
* 156385
* 156411
* 158907
* 163071
* 164896

Gliese|

* Gliese 674
* Gliese 676

Other|

* 41 G.
* BPM 25114
* CPD -56 8032
* CXOU J164710.2−455216
* GX 339-4
* IRAS 16594-4656
* PSR J1644−4559
* SAO 244567
* SGR 1627-41
* 4U 1636-53
* Westerlund 1-26
* XTE J1650-500
* XTE J1701-462
* 2MASS J18082002−5104378

Star
clusters|

| Association|

* Ara OB1

|

Open|

* IC 4651
* NGC 6193
* NGC 6200
* NGC 6204
* NGC 6208
* NGC 6250
* NGC 6253
* Westerlund 1

Globular|

* ESO 280-SC06
* NGC 6352
* NGC 6362
* NGC 6397

Nebulae|

| Star-forming|

* NGC 6188

|

Planetary|

* IC 4642
* NGC 6326
* Stingray Nebula
* Tc 1

Galaxies|

| NGC|

* 6215
* 6215A
* 6221
* 6300
* 6305
* 6328

|

Other|

* PKS 1718-649

* v
* t
* e

Galaxies

Morphology|

* Disc
* Lenticular
* barred
* unbarred
* Spiral
* anemic
* barred
* flocculent
* grand design
* intermediate
* Magellanic
* unbarred
* Dwarf galaxy
* elliptical
* irregular
* spheroidal
* spiral
* Elliptical galaxy
* cD
* Irregular
* barred
* Peculiar
* Ring
* Polar

Structure|

* Active galactic nucleus
* Bar
* Bulge
* Dark matter halo
* Disc
* Disc galaxy
* Halo
* corona
* Galactic center
* Galactic plane
* Galactic ridge
* Interstellar medium
* Protogalaxy
* Spiral arm
* Supermassive black hole

Active nuclei|

* Blazar
* LINER
* Markarian
* Quasar
* Radio
* X-shaped
* Relativistic jet
* Seyfert

Energetic galaxies|

* Lyman-alpha emitter
* Luminous infrared
* Starburst
* blue compact dwarf
* pea
* faint blue
* Hot dust-obscured

Low activity|

* Low surface brightness
* Ultra diffuse
* Dark galaxy

Interaction|

* Field
* Galactic tide
* Cloud
* Groups and clusters
* group
* cluster
* Brightest cluster galaxy
* fossile group
* Interacting
* merger
* Jellyfish
* Satellite
* Stellar stream
* Superclusters
* Walls
* Voids and supervoids
* void galaxy

Lists|

* Galaxies
* Galaxies named after people
* Largest
* Nearest
* Polar-ring
* Ring
* Spiral
* Groups and clusters
* Large quasar groups
* Quasars

* Superclusters
* Voids

See also|

* Extragalactic astronomy
* Galactic astronomy
* Galactic coordinate system
* Galactic empire
* Galactic habitable zone
* Galactic magnetic fields
* Galactic orientation
* Galactic quadrant
* Galaxy color–magnitude diagram
* Galaxy formation and evolution
* Galaxy rotation curve
* Illustris project
* Intergalactic dust
* Intergalactic stars
* Intergalactic travel
* Population III stars

* Book
* Category
* Portal

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

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