Umbriel (muin)

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Umbriel
PIA00040 Umbrielx2.47.jpg
Umbriel as seen bi Voyager 2 in 1986. At the tap is the lairge crater Wunda, whase waws enclose a reeng o bricht material.
Discovery
Discovered bi William Lassell
Discovery date October 24, 1851
Designations
Uranus II
Adjectives Umbrielian
Orbital chairactereestics[1]
266000 km
Eccentricity 0.0039
4.144 d
4.67 km/s (calculatit)
Inclination 0.128° (tae Uranus's equator)
Satellite o Uranus
Pheesical chairacteristics
Mean radius
584.7±2.8 km (0.092 Yirds)[2]
4296000 km2 (0.008 Yirds)[lower-alpha 1]
Vollum 837300000 km3 (0.0008 Yirds)[lower-alpha 2]
Mass (1.172±0.135)×1021 kg (2 × 10−4 Yirds)[3]
Mean density
1.39±0.16 g/cm3[3]
0.2 m/s2 (~ 0.023 g)[lower-alpha 3]
0.52 km/s[lower-alpha 4]
presumed synchronous[4]
0[4]
Albedo
  • 0.26 (geometrical)
  • 0.10 (Bond)[5]
Surface temp. min mean max
solstice[6] ? ≈ 75 K 85 K
14.5 (V-band, opposeetion)[7]
Atmosphere
Surface pressur
zero

Umbriel is a muin o Uranus discovered on October 24, 1851, bi William Lassell.

Notes[eedit | eedit soorce]

  1. Surface aurie derived frae the radius r : .
  2. Volume 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 : .

References[eedit | eedit soorce]

  1. "Planetary Satellite Mean Orbital Parameters". Jet Propulsion Laboratory, California Institute of Technology. 
  2. 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. 
  3. 3.0 3.1 Jacobson, R. A.; Campbell, J. K.; Taylor, A. H.; Synnott, S. P. (Juin 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. 
  4. 4.0 4.1 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 Julie 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. 
  5. 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. 
  6. 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:0704.1525Freely accessible. Bibcode:2006Icar..184..543G. doi:10.1016/j.icarus.2006.04.016. 
  7. "Planetary Satellite Physical Parameters". NASA/JPL. Retrieved Juin 6, 2010.