Oberon, an aa designatit Uranus IV, is the ootermaist major muin o the planet Uranus.

Voyager 2 picture of Oberon.jpg
The best Voyager 2 eemage o Oberon[caption 1]
Discovered biWilliam Herschel
Discovery dateJanuar 11, 1787[1]
Uranus IV
Orbital chairactereestics
583520 km[3]
13.463234 d[3]
3.15 km/s (calculatit)
Inclination0.058° (tae Uranus's equator)[3]
Satellite oUranus
Pheesical chairacteristics
Mean radius
761.4±2.6 km (0.1194 Yirds)[4]
7285000 km2[lower-alpha 1]
Vollum1849000000 km3[lower-alpha 2]
Mass(3.014±0.075)×1021 kg (5.046×10−4 Earths)[5]
Mean density
1.63±0.05 g/cm³[5]
0.348 m/s²[lower-alpha 3]
0.726 km/s[lower-alpha 4]
presumed synchronous[6]
  • 0.31 (geometrical)
  • 0.14 (Bond)[7]
Temperatur70–80 K[8]
Surface pressur


  1. A nummer o bright-rayed craters are veesible. Hamlet, juist ablo centre, haes daurk material on its fluir; tae its upper left is smawer Othello. Abuin the limm at lawer left rises an 11 km heich moontain, probably the central peak o anither crater. Mommur Chasma runs alang the terminator at upper richt.
  1. Surface aurie derived frae the radius r:  .
  2. Vollum v derived frae the radius r:  .
  3. Surface gravity derived frae the mass m, the gravitational constant G an the radius r:  .
  4. Escape velocity derived frae the mass m, the gravitational constant G an the radius r: 2Gm/r.


  1. Herschel, W. S. (1787). "An Account of the Discovery of Two Satellites Revolving Round the Georgian Planet". Philosophical Transactions of the Royal Society of London. 77: 125–129. doi:10.1098/rstl.1787.0016. JSTOR 106717.CS1 maint: ref=harv (link)
  2. Shakespeare, William (1935). A midsummer night's dream. Macmillan. p. xliv. ISBN 0-486-44721-9.
  3. 3.0 3.1 3.2 3.3 "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory, California Institute of Technology.
  4. Thomas, P. C. (1988). "Radii, shapes, and topography of the satellites of Uranus from limb coordinates". Icarus. 73 (3): 427–441. Bibcode:1988Icar...73..427T. doi:10.1016/0019-1035(88)90054-1.
  5. 5.0 5.1 Jacobson, R. A.; Campbell, J. K.; Taylor, A. H.; Synnott, S. P. (June 1992). "The masses of Uranus and its major satellites from Voyager tracking data and earth-based Uranian satellite data". The Astronomical Journal. 103 (6): 2068–2078. Bibcode:1992AJ....103.2068J. doi:10.1086/116211.
  6. Smith, B. A.; Soderblom, L. A.; Beebe, A.; Bliss, D.; Boyce, J. M.; Brahic, A.; Briggs, G. A.; Brown, R. H.; Collins, S. A. (4 July 1986). "Voyager 2 in the Uranian System: Imaging Science Results". Science. 233 (4759): 43–64. Bibcode:1986Sci...233...43S. doi:10.1126/science.233.4759.43. PMID 17812889.
  7. Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus. 151 (1): 51–68. Bibcode:2001Icar..151...51K. doi:10.1006/icar.2001.6596.
  8. Grundy, W. M.; Young, L. A.; Spencer, J. R.; Johnson, R. E.; Young, E. F.; Buie, M. W. (October 2006). "Distributions of H2O and CO2 ices on Ariel, Umbriel, Titania, and Oberon from IRTF/SpeX observations". Icarus. 184 (2): 543–555. arXiv:0704.1525. Bibcode:2006Icar..184..543G. doi:10.1016/j.icarus.2006.04.016.
  9. Newton, Bill; Teece, Philip (1995). The guide to amateur astronomy. Cambridge University Press. p. 109. ISBN 978-0-521-44492-7.