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NGC 6752

Globular cluster in the constellation Pavo

Globular cluster in the constellation Pavo

FieldValue
nameNGC 6752
image[[Image:NGC 6752 Hubble WikiSky.jpg240px]]
captionNGC 6752 by Hubble Space Telescope; 3.5 view
epochJ2000
classVI
constellationPavo
ra
dec
dist_ly13.0 kly
appmag_v5.4
size_v20.4
mass_msol
v_hb13.7
metal_fe–1.24
age11.78 Gyr
namesCaldwell 93, NGC 6777

NGC 6752 (also known as Caldwell 93 and nicknamed the Great Peacock Globular) is a globular cluster in the constellation Pavo.

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.

References

References

  1. (11 December 2012). "Imaging the Southern Sky". Springer.
  2. "Your NED Search Results".
  3. "New General Catalog Objects: NGC 6750 - 6799".
  4. "NGC/IC Project Restoration Efforts".
  5. "Hubble fortuitously discovers a new galaxy in the cosmic neighbourhood".
  6. "Low Sodium Diet Key to Old Age for Stars". ESO Press Release.
  7. (December 2010). "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters". The Astronomical Journal.
  8. (August 1927). "A Classification of Globular Clusters". Harvard College Observatory Bulletin.
  9. Mobberley, Martin. (1999). "The Caldwell Objects And How to Observe Them". Springer.
  10. (May 2010). "Accreted versus in situ Milky Way globular clusters". [[Monthly Notices of the Royal Astronomical Society]].
  11. (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.
  12. "Deep-Sky Companions: Southern Gems". [[Cambridge University Press]]. (2013). link
  13. "NGC 6752".
  14. (November 2011). "Young Radio Pulsars in Galactic Globular Clusters". The Astrophysical Journal.
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globular-clusters pavo-(constellation) ngc-objects caldwell-objects
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