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Adding local short description: "Globular cluster in the constellation Ophiuchus", overriding Wikidata description "globular cluster"
 
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{{Short description|Globular cluster in the constellation Ophiuchus}}
{{Infobox globular cluster
{{Infobox globular cluster
| name = NGC 6284
| name = NGC 6284
| image = [[File:NGC 6284 hst 05899 R555G439B336.png|250px]]
| image = File:NGC 6284 WFC3.jpg
| caption = NGC 6284 as seen through the [[Hubble Space Telescope]]
| caption = NGC 6284 as seen through the [[Hubble Space Telescope]]
| credit = [[NASA]]/[[ESA]]
| credit =
| epoch = [[J2000]]
| epoch = [[J2000]]
| class = IX
| class = IX
Line 9: Line 10:
| ra = {{RA|17|04|28.747}}<ref name=SIMBAD>{{cite simbad|title=NGC 6284|access-date 3 February 2017}}</ref>
| ra = {{RA|17|04|28.747}}<ref name=SIMBAD>{{cite simbad|title=NGC 6284|access-date 3 February 2017}}</ref>
| dec = {{DEC|-24|45|51.22}}<ref name=SIMBAD/>
| dec = {{DEC|-24|45|51.22}}<ref name=SIMBAD/>
| dist_ly = 43,000 ly<ref name="phys.org">{{cite web | url=https://phys.org/news/2023-11-globular-cluster-ngc-astronomers.html | title=Globular cluster NGC 6284 inspected by astronomers }}</ref>
| dist_ly = 49900 ly<ref name=Seds1/>
| dist_pc = 13,200 pc<ref name="phys.org">{{cite web | url=https://phys.org/news/2023-11-globular-cluster-ngc-astronomers.html | title=Globular cluster NGC 6284 inspected by astronomers }}</ref>
| dist_pc = 15300 pc<ref name=Seds1/>
| appmag_v = 7.43<ref name=SIMBAD/>
| appmag_v = 7.43<ref name=SIMBAD/>
| size_v = 6.2' &times; 6.2'<ref name=Seds/>
| size_v = 6.2' × 6.2'<ref name=Seds/>
| mass_msol =
| mass_msol =
| mass_kg =
| mass_kg =
Line 18: Line 19:
| metal_fe = -1.26<ref>{{cite web|title=Catalog of Parameters for Milky Way Globular Clusters|url=http://physwww.mcmaster.ca/~harris/mwgc.dat|author1=William E. Harris|access-date=3 February 2017}}</ref>
| metal_fe = -1.26<ref>{{cite web|title=Catalog of Parameters for Milky Way Globular Clusters|url=http://physwww.mcmaster.ca/~harris/mwgc.dat|author1=William E. Harris|access-date=3 February 2017}}</ref>
| metal_z =
| metal_z =
| age =
| age =13.3~ billion years
| notes =
| notes =
| names = GCl 53, [[2MASX]] J17042874-2445512<ref name=SIMBAD/>
| names = GCl 53, [[2MASX]] J17042874-2445512<ref name=SIMBAD/>
|image size=250}}
}}
'''NGC 6284''' is a [[globular cluster]] located in the constellation [[Ophiuchus]]. It is designated as '''IX''' in the [[Galaxy morphological classification|galaxy morphological classification scheme]] and was discovered by the German-born British astronomer [[William Herschel]] on 22 May 1784. It is at a distance of 49,900 light years away from earth.<ref name="NASA/IPAC">{{cite web|title=Object No. 1 - NGC 6284|url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+6284&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|website=NASA/IPAC extragalactic database|publisher=NASA/IPAC|access-date=3 October 2015}}</ref><ref name=Seds>{{cite web|title=Revised NGC Data for NGC 6284|url=http://spider.seds.org/ngc/revngcic.cgi?NGC6284|website=Seds|access-date=3 October 2015}}</ref><ref name=cseligman>{{cite web|title=NGC 6284 (= GCL 53)|url=http://cseligman.com/text/atlas/ngc62a.htm#6284|website=cseligman|access-date=3 October 2015}}</ref><ref name=Seds1>{{cite web|title=NGC 6284|url=http://spider.seds.org/spider/MWGC/n6284.html|website=Seds|access-date=3 October 2015}}</ref><ref name=In-the-sky>{{cite web|title=The globular cluster NGC 6284|url=https://in-the-sky.org/data/object.php?id=5051|website=In-the-sky|access-date=3 October 2015}}</ref>
'''NGC 6284''' is a [[globular cluster]] located in the constellation [[Ophiuchus]]. It is designated as '''IX''' in the [[Galaxy morphological classification|galaxy morphological classification scheme]] and was discovered by the German-born British astronomer [[William Herschel]] on 22 May 1784. Its distance had previously been estimated at 49,900 light years from Earth,<ref name="NASA/IPAC">{{cite web|title=Object No. 1 - NGC 6284|url=http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+6284&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|website=NASA/IPAC extragalactic database|publisher=NASA/IPAC|access-date=3 October 2015}}</ref><ref name=Seds>{{cite web|title=Revised NGC Data for NGC 6284|url=http://spider.seds.org/ngc/revngcic.cgi?NGC6284|website=Seds|access-date=3 October 2015}}</ref><ref name=cseligman>{{cite web|title=NGC 6284 (= GCL 53)|url=http://cseligman.com/text/atlas/ngc62a.htm#6284|website=cseligman|access-date=3 October 2015}}</ref><ref name=Seds1>{{cite web|title=NGC 6284|url=http://spider.seds.org/spider/MWGC/n6284.html|website=Seds|access-date=3 October 2015}}</ref><ref name=In-the-sky>{{cite web|title=The globular cluster NGC 6284|url=https://in-the-sky.org/data/object.php?id=5051|website=In-the-sky|access-date=3 October 2015}}</ref> but this was revised in 2023 to around 43,000 light years.<ref name="phys.org">{{cite web | url=https://phys.org/news/2023-11-globular-cluster-ngc-astronomers.html | title=Globular cluster NGC 6284 inspected by astronomers }}</ref> This same study, based on high-resolution [[Hubble Space Telescope]] optical observations, produced the first high-quality colour-magnitude diagram (CMD) of NGC 6284, extending down to about six magnitudes below its main sequence turn-off. The new observations moved its centre of gravity by 1.5–3 arcseconds from previous values, and its density profile showed a steep central cusp, suggesting that NGC 6284 is a post-core collapse (PCC) cluster.

The nearby metal-poor star {{ill|HD 194598|es|HD 194598}} may be a recent [[Runaway star|runaway]] from NGC 6284.<ref>{{citation|arxiv=2007.08514|year=2020|title=On the Origin of Metal-poor Stars in the Solar Neighborhood|doi=10.3847/1538-4357/aba2d2 |last1=Şahin |first1=Timur |last2=Bilir |first2=Selçuk |journal=The Astrophysical Journal |volume=899 |issue=1 |page=41 |bibcode=2020ApJ...899...41S |s2cid=220545932 |doi-access=free }}</ref>


== See also ==
== See also ==
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== External links ==
== External links ==
* {{commonscat-inline}}
* {{commons category-inline}}


{{NGC objects:6000-6499}}

{{Ngc65}}
⚫
{{Star-cluster-stub}}


[[Category:Globular clusters]]
[[Category:Globular clusters]]
[[Category:NGC objects|6284]]
[[Category:NGC objects|6284]]
[[Category:Ophiuchus (constellation)]]
[[Category:Ophiuchus]]


⚫
{{Star-cluster-stub}}

Latest revision as of 22:42, 23 July 2024

NGC 6284
NGC 6284 as seen through the Hubble Space Telescope
Observation data (J2000 epoch)
ClassIX
ConstellationOphiuchus
Right ascension17h 04m 28.747s[1]
Declination−24° 45′ 51.22″[1]
Distance43,000 ly[2] (13,200 pc[2])
Apparent magnitude (V)7.43[1]
Apparent dimensions (V)6.2' × 6.2'[3]
Physical characteristics
Metallicity = -1.26[4] dex
Estimated age13.3~ billion years
Other designationsGCl 53, 2MASX J17042874-2445512[1]
See also: Globular cluster, List of globular clusters

NGC 6284 is a globular cluster located in the constellation Ophiuchus. It is designated as IX in the galaxy morphological classification scheme and was discovered by the German-born British astronomer William Herschel on 22 May 1784. Its distance had previously been estimated at 49,900 light years from Earth,[5][3][6][7][8] but this was revised in 2023 to around 43,000 light years.[2] This same study, based on high-resolution Hubble Space Telescope optical observations, produced the first high-quality colour-magnitude diagram (CMD) of NGC 6284, extending down to about six magnitudes below its main sequence turn-off. The new observations moved its centre of gravity by 1.5–3 arcseconds from previous values, and its density profile showed a steep central cusp, suggesting that NGC 6284 is a post-core collapse (PCC) cluster.

The nearby metal-poor star HD 194598 [es] may be a recent runaway from NGC 6284.[9]

See also

[edit]

References

[edit]
  1. ^ a b c d "NGC 6284". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. ^ a b c "Globular cluster NGC 6284 inspected by astronomers".
  3. ^ a b "Revised NGC Data for NGC 6284". Seds. Retrieved 3 October 2015.
  4. ^ William E. Harris. "Catalog of Parameters for Milky Way Globular Clusters". Retrieved 3 February 2017.
  5. ^ "Object No. 1 - NGC 6284". NASA/IPAC extragalactic database. NASA/IPAC. Retrieved 3 October 2015.
  6. ^ "NGC 6284 (= GCL 53)". cseligman. Retrieved 3 October 2015.
  7. ^ "NGC 6284". Seds. Retrieved 3 October 2015.
  8. ^ "The globular cluster NGC 6284". In-the-sky. Retrieved 3 October 2015.
  9. ^ Şahin, Timur; Bilir, Selçuk (2020), "On the Origin of Metal-poor Stars in the Solar Neighborhood", The Astrophysical Journal, 899 (1): 41, arXiv:2007.08514, Bibcode:2020ApJ...899...41S, doi:10.3847/1538-4357/aba2d2, S2CID 220545932
[edit]
  • Media related to NGC 6284 at Wikimedia Commons


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