# NGC 4833

NGC 4833
NGC 4833 is one of the over 150 globular clusters known to reside within the Milky Way.[1]
Credit: ESA/Hubble and NASA
Observation data (J2000 epoch)
Class VIII[2]
Constellation Musca
Right ascension 12h 59m 33.92s[3]
Declination –70° 52′ 35.4″[3]
Distance 21.5 kly (6.6 kpc)[4]
Apparent magnitude (V) +7.79[5]
Apparent dimensions (V) 13′.5
Physical characteristics
Mass 4.10×105[4] M
Metallicity ${\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}$ = –1.71[7] dex
Estimated age 12.54 Gyr[7]
Other designations GCl 21,[5] Lacaille I.4
Dunlop 164, Bennett 56

NGC 4833 (also known as Caldwell 105) is a globular cluster discovered by Abbe Lacaille during his 1751-1752 journey to South Africa, and catalogued in 1755. It was subsequently observed and catalogued by James Dunlop and 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 years 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 M5 or M92.