Juliet (moon)
| Discovery | |
|---|---|
| Discovered by | Stephen P. Synnott / Voyager 2 |
| Discovery date | January 3, 1986 |
| Orbital characteristics | |
| 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 |
| Physical characteristics | |
| 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] |
Juliet is a closer moon to Uranus. It was found from the images taken by Voyager 2 on 1986-01-03, and was given the 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 moons, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[4] These moons 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] almost nothing is known about it.
At the Voyager 2 images Juliet appears as a stretched 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]
References[change]
- ↑ 1.0 1.1 1.2 1.3 1.4 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:10.1086/300263. http://adsabs.harvard.edu/abs/1998AJ....115.1195J.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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:10.1006/icar.2001.6597. http://adsabs.harvard.edu/abs/2001Icar..151...69K.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Calculated on the basis of other parameters
- ↑ 4.0 4.1 4.2 4.3 Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151: 51–68. doi:10.1006/icar.2001.6596. http://adsabs.harvard.edu/abs/2001Icar..151...51K.
- ↑ Smith, B. A. (January 16 1986). "IAU Circular No. 4164". http://cfa-www.harvard.edu/iauc/04100/04164.html#Item1. Retrieved 2006-08-06.
- ↑ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21 2006. http://planetarynames.wr.usgs.gov/append7.html. Retrieved 2006-08-06.
Other websites[change]
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