| NGC 4833 | |
|---|---|
 NGC 4833 is one of the over 150 globular clusters known to reside within the Milky Way.[1] | |
| 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☉ |
| Radius | 42 ly[6] |
| Metallicity | = –1.71[7] dex |
| Estimated age | 12.54 Gyr[7] |
| Other designations | Caldwell 105, GCl 21,[5] Lacaille I.4 Dunlop 164, Bennett 56 |
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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.
