NGC 4833 4243417 221327964 2008-06-24T01:18:31Z Friendlystar 1171556 +image +wikisky link {{ 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&prime;.5 | mass_kg = | mass_msol = | radius_ly = 42 ly<ref>distance &times; 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]] {{star-cluster-stub}} [[de:NGC 4833]] [[eo:NGC 4833]] [[it:NGC 4833]] [[pl:NGC 4833]] [[ru:NGC 4833]] [[sk:NGC 4833]] [[uk:NGC 4833]] [[zh:NGC 4833]]