Juliet (moon)
From Wikipedia, the free encyclopedia
- There is also an asteroid called 1285 Julietta.
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Discovery
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| Discovered by | Stephen P. Synnott / Voyager 2 |
| Discovery date | January 3, 1986 |
| Semi-major axis | 64,358.222 ± 0.048 km[1] |
| Eccentricity | 0.00066 ± 0.000087[1] |
| Orbital period | 0.493065490 ± 0.000000012 d[1] |
| Inclination | 0.06546 ± 0.040° (to Uranus' equator)[1] |
| Satellite of | Uranus |
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Physical characteristics
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| Dimensions | 150 × 74 × 74 km[2] |
| Mean radius | 53 ± 4 km[2] |
| Surface area | ~35,000 km²[3] |
| Volume | ~632,000 km³[3] |
| Mass | ~8.2×1017 kg[3] |
| Mean density | ~1.3 g/cm³ assumed |
| Equatorial surface gravity | ~0.016 m/s2[3] |
| Escape velocity | ~0.040 km/s[3] |
| Rotation period | synchronous[2] |
| Axial tilt | zero[2] |
| Albedo | 0.08 ± 0.01[4] |
| Temperature | ~64 K[3] |
Juliet (jew'-lee-ət, IPA: /ˈdʒuliət/, or jew'-lee-et', /ˌdʒuliˈɛt/) is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 1986-01-03, and was given the temporary designation S/1986 U 2.[5] It is named after the heroine of William Shakespeare's play Romeo and Juliet. It is also designated Uranus XI.[6]
Juliet belongs to Portia Group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[4] These satellites have similar orbits and photometric properties.[4] Unfortunately, other than its orbit,[1] radius of 53 km[2] and geometric albedo of 0.08[4] virtually nothing is known about it.
At the Voyager 2 images Juliet appears as an elongated object, the major axis pointing towards Uranus. The ratio of axises of the 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.[7]
[edit] References
- ^ a b c d e Jacobson, R.A. (1998). "The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager2 Observations". The Astronomical Journal 115: 1195-1199. doi:.
- ^ 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: 69–77. doi:.
- ^ a b c d e f Calculated on the basis of other parameters
- ^ a b c d Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151: 51–68. doi:.
- ^ Smith, B. A. (January 16 1986). IAU Circular No. 4164. Retrieved on 2006-08-06.
- ^ Planet and Satellite Names and Discoverers. Gazetteer of Planetary Nomenclature. USGS Astrogeology (July 21 2006). Retrieved on 2006-08-06.
- ^ Duncan, Martin J.; Jack J. Lissauer (1997). "Orbital Stability of the Uranian Satellite System". Icarus 125 (1): 1-12. doi:.
[edit] External links
- Juliet Profile by NASA's Solar System Exploration
- Juliet + Ring diagram (Courtesy of Astronomy Magazine 2005)
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