Juliet (moon)

Short description: Moon of Uranus

There is also an asteroid called 1285 Julietta.
Juliet

Discovery
Discovered by| Stephen P. Synnott / Voyager 2
Discovery date| January 3, 1986
Designations

Designation

| Uranus XI
Pronunciation| /ˈdʒuːliɛt/[1]
Adjectives| Julietian[2]
Orbital characteristics

Semi-major axis

| 64,358.222 ± 0.048 km[3]
Eccentricity| 0.00066 ± 0.000087[3]
Orbital period| 0.493065490 ± 0.000000012 d[3]
Inclination| 0.06546 ± 0.040° (to Uranus' equator)[3]
Satellite of| Uranus
Physical characteristics
Dimensions| 150 × 74 × 74 km[4]
Mean radius| 46.8 ± 4 km[4][5][6]
Surface area| ~35,000 km2[lower-alpha 1]
Volume| ~632,000 km3[lower-alpha 1]
Mass| ~5.6×1017 kg[lower-alpha 1]
Mean density| ~1.3 g/cm3 (assumed)[5]

surface gravity

| ~0.016 m/s2[lower-alpha 1]

escape velocity

| ~0.040 km/s[lower-alpha 1]
Rotation period| synchronous[4]
Axial tilt| zero[4]
Albedo| 0.08 ± 0.01[7]
Physics| ~64 K[lower-alpha 1]

Juliet 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.[8] It is named after the heroine of William Shakespeare's play Romeo and Juliet. It is also designated Uranus XI.[9]

Juliet belongs to Portia Group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[7] These satellites have similar orbits and photometric properties.[7] Other than its orbit,[3] radius of 53 km[4] and geometric albedo of 0.08,[7] virtually nothing is known about Juliet.

In 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.[4] Its surface is grey in color.[4]

Juliet may collide with Desdemona within the next 100 million years.[10]

## See also

* Moons of Uranus

## References

Explanatory notes

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Calculated on the basis of other parameters.

Citations

1. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
2. ↑ W. M. Anderson (1892) 'Daniel Johnson Brimm', Shield and Diamond, vol. 2, no. 1, p. 116
3. ↑ 3.0 3.1 3.2 3.3 3.4 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. doi:10.1086/300263. Bibcode: 1998AJ....115.1195J.
4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Karkoschka, Erich (2001). "Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites". Icarus 151 (1): 69–77. doi:10.1006/icar.2001.6597. Bibcode: 2001Icar..151...69K.
5. ↑ 5.0 5.1 "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. http://ssd.jpl.nasa.gov/?sat_phys_par.
6. ↑ Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html.
7. ↑ 7.0 7.1 7.2 7.3 Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151 (1): 51–68. doi:10.1006/icar.2001.6596. Bibcode: 2001Icar..151...51K.
8. ↑ Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular 4164. http://www.cbat.eps.harvard.edu/iauc/04100/04164.html#Item1. Retrieved 29 October 2011.
9. ↑ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. http://planetarynames.wr.usgs.gov/Page/Planets.
10. ↑ Duncan, Martin J.; Lissauer, Jack J. (1997). "Orbital Stability of the Uranian Satellite System". Icarus 125 (1): 1–12. doi:10.1006/icar.1996.5568. Bibcode: 1997Icar..125....1D.

## External links

* Juliet Profile by NASA's Solar System Exploration
* Juliet + Ring diagram (Courtesy of Astronomy Magazine 2005)
* Uranus' Known Satellites (by Scott S. Sheppard)

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