NGC 6752

{{Infobox globular cluster

| name = NGC 6752

| image = 240px

| caption = NGC 6752 by Hubble Space Telescope; 3.5{{prime}} view

| credit =

| epoch = J2000

| class = VI

| constellation = Pavo

| ra = {{RA|19|10|52.11}}

| dec = {{DEC|–59|59|04.4}}

| dist_ly = {{Convert|13.0|kly|kpc|abbr=on|lk=on}}

| appmag_v = 5.4

| size_v = 20.4{{prime}}

| mass_msol = {{Val|1.4|e=5}}

| radius_ly =

| v_hb = 13.7

| metal_fe = –1.24

| age = 11.78 Gyr

| notes =

| names = Caldwell 93, NGC 6777}}

NGC 6752 (also known as Caldwell 93 and nicknamed the Great Peacock Globular{{cite book |last1=Chadwick |first1=S |last2=Cooper |first2=I |title=Imaging the Southern Sky |date=11 December 2012 |publisher=Springer |location=New York |isbn=978-1461447498 |page=242}}) 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.{{Cite web |title=Your NED Search Results |url=https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=Ngc+6777&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 |access-date=2024-08-29 |website=ned.ipac.caltech.edu}}{{Cite web |title=New General Catalog Objects: NGC 6750 - 6799 |url=https://cseligman.com/text/atlas/ngc67a.htm#6777 |access-date=2024-08-29 |website=cseligman.com}}{{Cite web |title=NGC/IC Project Restoration Efforts |url=https://ngcicproject.observers.org/NGC/NGC_67xx/NGC_6777.htm |access-date=2024-08-29 |website=ngcicproject.observers.org}}

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

File:The accidentally discovered galaxy Bedin I.tif|Galaxy nicknamed Bedin I is located behind the bright stars of the cluster.{{cite web |title=Hubble fortuitously discovers a new galaxy in the cosmic neighbourhood |url=https://www.spacetelescope.org/news/heic1903/ |website=www.spacetelescope.org |access-date=31 January 2019 |language=en}}

File:Star cluster NGC 6752.jpg|NGC 6752 taken by the Wide Field Imager on the MPG/ESO 2.2-meter telescope.{{cite news|title=Low Sodium Diet Key to Old Age for Stars|url=http://www.eso.org/public/news/eso1323/|access-date=30 May 2013|newspaper=ESO Press Release}}

File:The_globular_star_cluster_NGC_6752_in_the_constellation_of_Pavo.jpg|Map showing location of NGC 6752

References

{{reflist|refs=

{{citation | display-authors=1 | last1=Goldsbury | first1=Ryan | last2=Richer | first2=Harvey B. | last3=Anderson | first3=Jay | last4=Dotter | first4=Aaron | last5=Sarajedini | first5=Ata | last6=Woodley | first6=Kristin | title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters | journal=The Astronomical Journal | volume=140 | issue=6 | pages=1830–1837 |date=December 2010 | doi=10.1088/0004-6256/140/6/1830 | bibcode=2010AJ....140.1830G | postscript=. |arxiv = 1008.2755 | s2cid=119183070 }}

{{citation | last1=Shapley | first1=Harlow | last2=Sawyer | first2=Helen B. | title=A Classification of Globular Clusters | journal=Harvard College Observatory Bulletin | volume=849 | issue=849 | pages=11–14 |date=August 1927 | bibcode=1927BHarO.849...11S | postscript=. }}

{{cite book |title=The Caldwell Objects And How to Observe Them |first=Martin |last=Mobberley |author-link=Martin Mobberley |pages=194–95 |publisher=Springer |date=1999 |isbn=978-1-4419-0326-6| url= https://books.google.com/books?id=amPrWoOWgHcC&pg=PA194}}

{{citation | last1=Forbes | first1=Duncan A. | last2=Bridges | first2=Terry | title=Accreted versus in situ Milky Way globular clusters | journal=Monthly Notices of the Royal Astronomical Society | volume=404 | issue=3 | pages=1203–1214 |date=May 2010 | doi=10.1111/j.1365-2966.2010.16373.x | doi-access=free | bibcode=2010MNRAS.404.1203F | postscript=. |arxiv = 1001.4289 | s2cid=51825384 }}

{{citation | last1=Marks | first1=Michael | last2=Kroupa | first2=Pavel | title=Initial conditions for globular clusters and assembly of the old globular cluster population of the Milky Way | journal=Monthly Notices of the Royal Astronomical Society | volume=406 | issue=3 | pages=2000–2012 |date=August 2010 | doi=10.1111/j.1365-2966.2010.16813.x | doi-access=free | bibcode=2010MNRAS.406.2000M | postscript=. |arxiv = 1004.2255 | s2cid=118652005 }} Mass is from M_PD on Table 1.

{{Cite book | first1 = Stephen James | last1 = O'Meara | title = Deep-Sky Companions: Southern Gems | publisher = Cambridge University Press | pages = 410–12 | date = 2013 | isbn = 978-1-107-01501-2 | url = https://books.google.com/books?id=S5QIEKns33sC&pg=PA411| bibcode = 2013dcsg.book.....O }}

{{citation | display-authors=1 | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R. | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R. | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M. | last7=Freire | first7=P. C. | last8=Belczynski | first8=K. | title=Young Radio Pulsars in Galactic Globular Clusters | journal=The Astrophysical Journal | volume=742 | issue=1 | page=51 |date=November 2011 | doi=10.1088/0004-637X/742/1/51 | bibcode=2011ApJ...742...51B | postscript=. |arxiv = 1108.4402 | s2cid=118649860 }}

}}

External links

{{WikiSky}}
[https://web.archive.org/web/20060927064240/http://www.seds.org/~spider/ngc/ngc.cgi?NGC+6752 http://seds.org/]

Category:Globular clusters

Category:Pavo (constellation)

6752

093b