Juliet (moon)

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[3]

Semi-major axis

| 64,358.222 ± 0.048 km
Eccentricity| 0.00066 ± 0.000087

Orbital period (sidereal)

| 0.493065490 ± 0.000000012 d
Inclination| 0.06546 ± 0.040° (to Uranus' equator)
Satellite of| Uranus
Physical characteristics
Dimensions| 150 × 74 × 74 km[4][note 1]

Surface area

| ~30,000 km2[a]
Volume| 430100±23.0% km3[5]
Mass| (3.871±0.891)×1017 kg[5]

Mean density

| ≥0.61 g/cm3[5]
~0.90 g/cm3 (assumed)

Surface gravity

| ~0.005–0.019 m/s2[a]

Escape velocity

| ~0.026–0.037 km/s[a]

Synodic rotation period

| synchronous[4]

Axial tilt

| zero[4]
Albedo| 0.08 ± 0.01[6]
Temperature| ~64 K[a]

1. ^ Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

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

Juliet belongs to the Portia group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[6] These satellites have similar orbits and photometric properties.[6] Other than its orbit,[3] size of 150 × 74 km[4] and geometric albedo of 0.08,[6] 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.[9]

## See also[edit]

* Moons of Uranus

## Notes[edit]

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

## References[edit]

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. ^ a b 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.
4. ^ a b c d e f 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.
5. ^ a b c French, Richard G.; Hedman, Matthew M.; Nicholson, Philip D.; Longaretti, Pierre-Yves; McGhee-French, Colleen A. (2024-03-15). "The Uranus system from occultation observations (1977–2006): Rings, pole direction, gravity field, and masses of Cressida, Cordelia, and Ophelia". Icarus. 411: 115957. arXiv:2401.04634. Bibcode:2024Icar..41115957F. doi:10.1016/j.icarus.2024.115957. ISSN 0019-1035.
6. ^ 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.
7. ^ Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular. 4164. Retrieved 29 October 2011.
8. ^ "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
9. ^ 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.

## External links[edit]

* 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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