View source for NGC 2516

{{short description|Open cluster in the constellation Carina}}
{{Infobox open cluster|
| name = [[New General Catalogue|NGC]] 2516
| image = [[File:NGC 2516.jpg|250px]]
| caption = NGC 2516
| constellation = [[Carina (constellation)|Carina]]
| epoch = J2000.0
| class = VII
| ra = {{RA|07|58|20}}
| dec = {{DEC|-60|52}} 
| dist_ly = 1.3 [[light year|kly]]
| dist_pc = 
| appmag_v = 3.8
| size_v = 30.0{{prime}}
| mass_kg = 
| mass_msol = 10<sup>5</sup> to 10<sup>6</sup>{{cn|date=January 2021}}
| radius_ly = 
| v_hb = 14.2
| age = 
| notes = 
| names = [[NGC objects|NGC]] 2516, [[Caldwell catalogue|Caldwell]] 96, [[Collinder catalogue|Cr]] 172
}}
'''NGC 2516''' (also known as '''Caldwell 96''') is an [[open cluster|open star cluster]] in the southern sky in the constellation [[Carina (constellation)|Carina]] discovered by [[Abbe Lacaille]] in 1751-1752.<ref name=Jones_1969>{{cite journal
 | title=The search for the nebulae - VI
 | last=Jones | first=K. G.
 | journal=Journal of the British Astronomical Association
 | volume=79 | pages=213–222 | date=March 1969
 | bibcode=1969JBAA...79..213J
}}</ref> It is also called''' Southern Beehive'''<ref>{{cite web |url=http://oneminuteastronomer.com/1135/southern-beehive-cluster/ |title=Beginner's Guide to the Night Sky : Summer Sky Tour |first=Genelle |last=Weule |work=abc.com |date=2010 |access-date=15 April 2016 |archive-date=18 March 2018 |archive-url=https://web.archive.org/web/20180318054339/https://oneminuteastronomer.com/1135/southern-beehive-cluster/ |url-status=dead }}</ref><ref>{{cite web |url=http://oneminuteastronomer.com/1135/southern-beehive-cluster/ |title=ESA's 'The "Southern Beehive" Cluster |first=Brian |last=Ventrudo |work=americaspace.com |date=2009 |access-date=15 April 2016 |archive-date=18 March 2018 |archive-url=https://web.archive.org/web/20180318054339/https://oneminuteastronomer.com/1135/southern-beehive-cluster/ |url-status=dead }}</ref> or  the '''Sprinter'''.<ref>{{cite web |url= http://www.americaspace.com/?p=52966 |title=ESA's 'Mission: Impossible' Sees First Light: Gaia Opens Her Eyes to the Galaxy « AmericaSpace |first=Leonidas |last= Papadopoulos |work=americaspace.com |date=2014  |access-date=13 June 2014}}</ref><ref>''Imaging the Southern Sky : An Amateur Astronomer's Guide'' Chadwick, S., Cooper, I., pg.viii, Pub. Springer (2012)</ref>

==Description==
This bright cluster itself is easily visible with the naked eye as a hazy patch, but is resolvable into stars using binoculars. It contains two 5th magnitude [[red giants|red giant stars]] and three main [[double stars|visual double stars]]: HJ 4027, HJ 4031 and I 29. A small [[telescope]] would be required to split the double stars, which are all pairs of 8-9 magnitude and 1-10 arcseconds separation.<ref>{{cite journal|title=Burnham's Celestial Handbook|author=Robert Burnham Jr.|year=1978|page=458 }}</ref>

NGC&nbsp;2516 and the recently discovered nearby [[star cluster]] [[Mamajek 2]] in [[Ophiuchus]] have similar age and [[metallicity]]. Recently, kinematic evidence was presented by E. Jilinski and coauthors that suggests that these two stellar groups may have formed in the same star-forming complex some 135 million years ago.<ref>{{cite journal|title=Dynamical Evolution and Spectral Characteristics of the Stellar Group Mamajek 2|author=Jilinski, E. |display-authors=4 |author2=Ortega, V.G. |author3=de la Reza, R. |author4=Drake, N.A. |author5=Bazzanella, B. |name-list-style=amp |date=2009|journal=Astrophysical Journal|volume=691|issue=1|pages=212|bibcode=2009ApJ...691..212J|doi=10.1088/0004-637X/691/1/212|arxiv=0810.1198|s2cid=15570695 }}</ref>

The cluster is surrounded by the 500-parsec diameter halo consisting of stars ejected from cluster.<ref>{{citation|arxiv=2107.08050|year=2021|title=Rotation and Lithium Confirmation of a 500 pc Halo for the Open Cluster NGC 2516|doi=10.3847/1538-3881/ac18cd|last1=Bouma|first1=L. G.|last2=Curtis|first2=J. L.|last3=Hartman|first3=J. D.|last4=Winn|first4=J. N.|last5=Bakos|first5=G. Á.|journal=The Astronomical Journal|volume=162|issue=5|page=197|bibcode=2021AJ....162..197B|s2cid=236088158 |doi-access=free }}</ref>

==References==
{{reflist}}

== Bibliography ==
{{Refbegin}}
* [[Robert Burnham, Jr.|Burnham, Robert]]. ''Burnham's Celestial Handbook''. Dover, 1978. {{ISBN|0-486-23567-X}}.
{{refend}}

==External links==
{{commonscat}}
* {{WikiSky}}
* [http://messier.seds.org/xtra/ngc/n2516.html SEDS] – NGC 2516

{{Sky|07|58|20|−|60|52|00|1300}}
{{Catalogs|NGC=2516|C=96|Collinder=172}}
{{Caldwell catalogue}}
{{Ngc30}}
{{Carina (constellation)}}

[[Category:NGC objects|2516]]
[[Category:Open clusters]]
[[Category:Carina (constellation)]]
[[Category:Caldwell objects|096b]]