NGC 6723

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NGC 6723
NGC 6723 Hubble WikiSky.jpg
NGC 6723 by Hubble Space Telescope; 3.5 view
Observation data (J2000 epoch)
Class VII [1]
Constellation Sagittarius
Right ascension 18h 59m 33.15s [2]
Declination –36° 37 56.1 [2]
Distance 28.4  kly (8.7  kpc) [3]
Apparent magnitude (V)6.8 [4]
Apparent dimensions (V)11 [4]
Physical characteristics
Mass3.57×105 [3]   M
Metallicity  = –0.96 [5] dex
Estimated age13.06  Gyr [5]
See also: Globular cluster, List of globular clusters

NGC 6723, also known as the Chandelier Cluster, [6] is a globular cluster [7] in the constellation Sagittarius. Its magnitude is given as between 6 and 6.8, and its diameter is between 7 and 11 arcminutes. It is a class VII cluster with stars of magnitude 14 and dimmer. It is near the border of Sagittarius and Corona Australis.

Unlike common globular clusters, NGC 6723 has an enhanced metallicity and a large fraction of younger stars, with primordial stars accounting for only 0.363±0.017 % of the total. [8]

Map showing location of NGC 6723 NGC 6729 map.png
Map showing location of NGC 6723

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<span class="mw-page-title-main">NGC 6934</span> Globular cluster in the constellation Delphinus

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<span class="mw-page-title-main">NGC 1261</span> Globular cluster in the constellation Horologium

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<span class="mw-page-title-main">NGC 6352</span> Globular cluster in the constellation Ara

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<span class="mw-page-title-main">NGC 6496</span> Globular cluster in the constellation Scorpius

NGC 6496 is a globular cluster which is in the direction of the Milky Way's galactic bulge based on observations collected with the WFPC2 on board the Hubble Space Telescope. NGC 6496 was originally believed to be a member of the disc system of the Galactic Center, but scientists questioned this classification. It was instead suggested that NGC 6496, together with two other clusters, NGC 6624 and NGC 6637, could be halo clusters with strongly inclined orbits. NGC 6496 lies in the Southern sky at RA=17:59:03.68 and Dec=-44:15:57.4.

<span class="mw-page-title-main">NGC 6541</span> Globular cluster in the constellation Corona Australis

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<span class="mw-page-title-main">NGC 5286</span> Globular cluster in the constellation Centaurus

NGC 5286 is a globular cluster of stars located some 35,900 light years away in the constellation Centaurus. At this distance, the light from the cluster has undergone reddening from interstellar gas and dust equal to E(B – V) = 0.24 magnitude in the UBV photometric system. The cluster lies 4 arc-minutes north of the naked-eye star M Centauri. It was discovered by Scottish astronomer James Dunlop, active in Australia, and listed in his 1827 catalog.

References

  1. Shapley, Harlow; Sawyer, Helen B. (August 1927), "A Classification of Globular Clusters", Harvard College Observatory Bulletin, 849 (849): 11–14, Bibcode:1927BHarO.849...11S.
  2. 1 2 Goldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal , 140 (6): 1830–1837, arXiv: 1008.2755 , Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830, S2CID   119183070.
  3. 1 2 Boyles, J.; et al. (November 2011), "Young Radio Pulsars in Galactic Globular Clusters", The Astrophysical Journal, 742 (1): 51, arXiv: 1108.4402 , Bibcode:2011ApJ...742...51B, doi:10.1088/0004-637X/742/1/51, S2CID   118649860.
  4. 1 2 "Data for NGC 6723". NGC/IC Project. Archived from the original on 15 January 2013. Retrieved 19 November 2013.
  5. 1 2 Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society , 404 (3): 1203–1214, arXiv: 1001.4289 , Bibcode:2010MNRAS.404.1203F, doi:10.1111/j.1365-2966.2010.16373.x, S2CID   51825384.
  6. Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN   978-1-107-50338-0. OCLC   920437579.
  7. "SIMBAD Astronomical Object Database". Results for NGC 6723. Retrieved 2007-04-21.
  8. Lee, Jae-Woo (2019), "Multiple Stellar Populations of Globular Clusters from Homogeneous Ca–CN–CH Photometry. V. cnJWL as a Surrogate cnJWL Index and NGC 6723", The Astrophysical Journal, 883 (2): 166, arXiv: 1908.06670 , doi: 10.3847/1538-4357/ab3d34 , S2CID   201070324