NGC 4833
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2008-06-24T01:18:31Z
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{{ Globular cluster |
| name = [[New General Catalogue|NGC]] 4833
| image = [[Image:NGC 4833.jpg|300px]]
| epoch = [[J2000]]
| class = VIII
| constellation = [[Musca]]
| ra = {{RA|12|59|34.98}}<ref name="simbad">{{cite web
| title=SIMBAD Astronomical Database
| work=Results for NGC 4833
| url=http://simbad.u-strasbg.fr/Simbad
| accessdate=2006-11-17}}</ref>
| dec = {{DEC|-70|52|28.6}}<ref name="simbad" />
| dist_ly = 21.2 [[lightyear|kly]]{{Fact|date=February 2007}}
| dist_pc = 6.5 [[parsec|kpc]]
| appmag_v = +7.79<ref name="simbad" />
| size_v = 13′.5
| mass_kg =
| mass_msol =
| radius_ly = 42 ly<ref>distance × sin( diameter_angle / 2 ) = 42 ly. radius</ref>
| v_hb =
| age = 15 Gyr{{Fact|date=February 2007}}
| notes =
| names = GCl 21,<ref name="simbad" /> Lacaille I.4<br>Dunlop 164, Bennett 56}}
'''NGC 4833''' is a [[globular cluster]] discovered by [[Nicolas Louis de Lacaille|Abbe Lacaille]] during his 1751-1752 journey to South Africa, and catalogued in 1755. It was subsequently observed and catalogued by [[James Dunlop]] and [[John Herschel|Sir John Herschel]] whose instruments could resolve it into individual stars.
The globular cluster is situated in the very southerly constellation [[Musca]] at a distance of 21,200 [[light year]]s from earth. It is partially obscured by a dusty region of the galactic plane. After corrections for the reddening by dust, evidence was obtained that it is in the order of 2 billion years older than globular clusters [[Messier 5|M5]] or [[M92]].
==References==
<div class="references-small"><references/></div>
# CCD Photometry of the Globular Cluster NGC 4833 and Extinction Near the Galactic Plane, Melbourne et al, 25 September 2000, Astrophysics Journal
==External links==
* [http://www.fortunecity.com/roswell/borley/49/u451.htm#NGC4833 Discovery and early observations]
* [http://www.seds.org/messier/xtra/ngc/n4833.html Basic information and data]
* [http://www.astrosurf.com/antilhue/ngc4833.htm Photographed by the Antilhue amateur astronomical observatory]
* [http://www.citebase.org/cgi-bin/citations?id=oai:arXiv.org:astro-ph/0009401 Photometry applied to NGC 4833]
* [http://ourworld.compuserve.com/homepages/silmerina/musglobs.htm Position relative to nearby cluster NGC 4372]
* {{WikiSky}}
==See also==
* [[New General Catalogue]]
[[Category:Globular clusters]]
[[Category:NGC objects|4833]]
[[Category:Musca constellation]]
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