Juliet (moon)

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There is also an asteroid called 1285 Julietta.
Discovered byStephen P. Synnott / Voyager 2
Discovery dateJanuary 3, 1986
Orbital characteristics
64,358.222 ± 0.048 km[1]
Eccentricity0.00066 ± 0.000087[1]
0.493065490 ± 0.000000012 d[1]
Inclination0.06546 ± 0.040° (to Uranus' equator)[1]
Satellite ofUranus
Physical characteristics
Dimensions150 × 74 × 74 km[2]
Mean radius
46.8 ± 4 km[2][3][4]
~35,000 km²[a]
Volume~632,000 km³[a]
Mass~5.6×1017 kg[a]
Mean density
~1.3 g/cm³ (assumed)[3]
~0.016 m/s2[a]
~0.040 km/s[a]
Albedo0.08 ± 0.01[5]
Temperature~64 K[a]

Juliet (/ˈliət/ JOO-lee-ət, /ˌliˈɛt/ JOO-lee-ET) is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 3 January 1986, and was given the temporary designation S/1986 U 2.[6] It is named after the heroine of William Shakespeare's play Romeo and Juliet. It is also designated Uranus XI.[7]

Juliet belongs to Portia Group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[5] These satellites have similar orbits and photometric properties.[5] Unfortunately, other than its orbit,[1] radius of 53 km[2] and geometric albedo of 0.08[5] virtually nothing is known about Juliet.

At the Voyager 2 images Juliet appears as an elongated object, the major axis pointing towards Uranus. The ratio of axes of Juliet's prolate spheroid is 0.5 ± 0.3, which is rather an extreme value.[2] Its surface is grey in color.[2]

Juliet may collide with Desdemona within the next 100 million years.[8]

See also[edit]


Explanatory notes

  1. ^ a b c d e f Calculated on the basis of other parameters.


  1. ^ a b c d e Jacobson, R. A. (1998). "The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager 2 Observations". The Astronomical Journal. 115 (3): 1195–1199. Bibcode:1998AJ....115.1195J. doi:10.1086/300263.
  2. ^ a b c d e f g Karkoschka, Erich (2001). "Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites". Icarus. 151 (1): 69–77. Bibcode:2001Icar..151...69K. doi:10.1006/icar.2001.6597.
  3. ^ a b "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. Retrieved 12 December 2008.
  4. ^ Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.
  5. ^ a b c d 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. ^ Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular. 4164. Retrieved 29 October 2011.
  7. ^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
  8. ^ Duncan, Martin J.; Lissauer, Jack J. (1997). "Orbital Stability of the Uranian Satellite System". Icarus. 125 (1): 1–12. Bibcode:1997Icar..125....1D. doi:10.1006/icar.1996.5568.

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