Juliet (moon)

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]

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	~5.6×10^17 kg[lower-alpha 1]
Mean density	~1.3 g/cm³ (assumed)[5]
Surface gravity	~0.016 m/s^2[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]
Temperature	~64 K[lower-alpha 1]

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] Unfortunately, other than its orbit,[3] radius of 53 km[4] and geometric albedo of 0.08[7] 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.[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. 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. 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. 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. "Planetary Satellite Physical Parameters". JPL (Solar System Dynamics). 24 October 2008. Retrieved 12 December 2008.
6. Williams, Dr. David R. (23 November 2007). "Uranian Satellite Fact Sheet". NASA (National Space Science Data Center). Retrieved 12 December 2008.
7. 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.
8. Smith, B. A. (January 16, 1986). "Satellites of Uranus". IAU Circular. 4164. Retrieved 29 October 2011.
9. "Planet and Satellite Names and Discoverers". Gazetteer of Planetary Nomenclature. USGS Astrogeology. July 21, 2006. Retrieved 6 August 2006.
10. 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

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