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NGC 6752
NGC 6752 by Hubble Space Telescope; 3.5′ view
Observation data (J2000 epoch)
Class	VI
Constellation	Pavo
Right ascension	19 10 52.11
Declination	–59° 59′ 04.4″
Distance	13.0 kly (4.0 kpc)
Apparent magnitude (V)	5.4
Apparent dimensions (V)	20.4′
Physical characteristics
Mass	1.4×10 M☉
VHB	13.7
Metallicity	${\displaystyle {\begin{smallmatrix}\left\end{smallmatrix}}}$ = –1.24 dex
Estimated age	11.78 Gyr
Other designations	Caldwell 93, NGC 6777
See also: Globular cluster, List of globular clusters

NGC 6752 (also known as Caldwell 93 and nicknamed the Great Peacock Globular) is a globular cluster in the constellation Pavo. It is the fourth-brightest globular cluster in the sky, after Omega Centauri, 47 Tucanae and Messier 22, respectively. It is best seen from June to October in the Southern Hemisphere. It is also known as NGC 6777, though this identification is uncertain.

NGC 6752 was first identified by one James Dunlop of Parramatta on 30 June 1826, who described it as an irregular bright nebula which could be resolved into a cluster of many stars, highly compressed at the centre. This corresponds with a core region densely populated with stars around 1.3 light-years in diameter, which indicates it has undergone core collapse. The cluster lies around 13,000 light-years distant and is one of the closer globular clusters to Earth. It also lies 17,000 light-years away from the galactic centre. It belongs to Shapley–Sawyer Concentration Class VI, namely of intermediate density, and has been calculated to be 11.78 billion years old. There are many binary stars in the system, as well as blue stragglers, which are likely to have been formed by collisions and mergers of smaller stars.

The apparent magnitude of the cluster is 5.4, so it can be seen with the unaided eye. However this depends on good viewing conditions with a minimum of light pollution. With binoculars it can be seen to cover an area three quarters the size of the full moon. It lies 1.5 degrees east of 5th-magnitude Omega Pavonis. The nearest bright star is Peacock, which lies 3.25 degrees north and 9.25 degrees east.

Six X-ray sources have been identified in the cluster's core by the Chandra X-Ray Observatory.

Gallery

• Galaxy nicknamed Bedin I is located behind the bright stars of the cluster.
• NGC 6752 taken by the Wide Field Imager on the MPG/ESO 2.2-meter telescope.
• Map showing location of NGC 6752

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. ^ 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. 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. "NGC 6752". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-04-21.
5. Marks, Michael; Kroupa, Pavel (August 2010), "Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way", Monthly Notices of the Royal Astronomical Society, 406 (3): 2000–2012, arXiv:1004.2255, Bibcode:2010MNRAS.406.2000M, doi:10.1111/j.1365-2966.2010.16813.x, S2CID 118652005. Mass is from M_PD on Table 1.
6. ^ 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.
7. Chadwick, S; Cooper, I (11 December 2012). Imaging the Southern Sky. New York: Springer. p. 242. ISBN 978-1461447498.
8. ^ O'Meara, Stephen James (2013). Deep-Sky Companions: Southern Gems. Cambridge University Press. pp. 410–12. Bibcode:2013dcsg.book.....O. ISBN 978-1-107-01501-2.
9. ^ Mobberley, Martin (1999). The Caldwell Objects And How to Observe Them. Springer. pp. 194–95. ISBN 978-1-4419-0326-6.
10. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-08-29.
11. "New General Catalog Objects: NGC 6750 - 6799". cseligman.com. Retrieved 2024-08-29.
12. "NGC/IC Project Restoration Efforts". ngcicproject.observers.org. Retrieved 2024-08-29.
13. "Hubble fortuitously discovers a new galaxy in the cosmic neighbourhood". www.spacetelescope.org. Retrieved 31 January 2019.
14. "Low Sodium Diet Key to Old Age for Stars". ESO Press Release. Retrieved 30 May 2013.

External links

• NGC 6752 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• http://seds.org/

v t e Constellation of Pavo
List of stars in Pavo Pavo in Chinese astronomy
Stars	Bayer α (Peacock) β γ δ ε ζ η θ ι κ λ μ μ ν ξ ο π ρ σ τ υ φ φ ω Variable R V X Y SX AR BD KZ MW NU NZ V346 V347 HR 6586 6624 6634 6740 6760 6796 6805 6808 6828 6899 6908 6939 6996 7004 7012 7015 7022 7027 7111 7130 7161 7221 7278 7320 7383 7434 7435 7455 7498 7513 7527 7531 7558 7579 7587 7588 7644 7663 7691 7707 7732 7838 7872 7959 8019 8061 8073 8081 8125 8159 HD 161475 162521 164427 175007 175167 176522 179419 181433 186302 190984 192887 195190 195772 196050 Other Gliese 693 SCR 1845−6357 SCR 1826−6542
Exoplanets HD 175167 b HD 181433 b c d HD 190984 b HD 196050 b
Galaxies	NGC 6744 6753 6782 6810 6872 7020 7032 7059 Other Bedin I IC 4662 IC 4687 IC 4710 IC 4970 IC 5052 IRAS 19254-7245
Galaxy clusters NGC 6752
Category

• Globular clusters
• Pavo (constellation)
• NGC objects
• Caldwell objects