Juliet (moon)


Juliet (moon)

:"There is also an asteroid called 1285 Julietta." Infobox Planet
name = Juliet
bgcolour = #ffc0c0
discovery = yes
discoverer = Stephen P. Synnott / "Voyager 2"
discovered = January 3, 1986
semimajor = 64,358.222 ± 0.048 kmcite journal|last=Jacobson|first=R.A.|title=The Orbits of the Inner Uranian Satellites From Hubble Space Telescope and Voyager2 Observations|journal=The Astronomical Journal|url=http://adsabs.harvard.edu/abs/1998AJ....115.1195J|year=1998|volume=115|pages=1195–1199|doi=10.1086/300263]
eccentricity = 0.00066 ± 0.000087
period = 0.493065490 ± 0.000000012 d
inclination = 0.06546 ± 0.040° (to Uranus' equator)
satellite_of = Uranus
physical_characteristics = yes
dimensions = 150 × 74 × 74 kmcite journal|last=Karkoschka|first=Erich|authorlink=Erich Karkoschka|title=Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites|journal=Icarus|volume=151|pages=69–77|year=2001| doi=10.1006/icar.2001.6597|url=http://adsabs.harvard.edu/abs/2001Icar..151...69K]
mean_radius = 53 ± 4 km
surface_area = ~35,000 km²Calculated on the basis of other parameters]
volume = ~632,000 km³
mass = ~8.2e|17 kg
density = ~1.3 g/cm³ "assumed"
surface_grav = ~0.016 m/s2
escape_velocity = ~0.040 km/s
rotation = synchronous
axial_tilt = zero
albedo = 0.08 ± 0.01cite journal|last=Karkoschka|first=Erich|authorlink=Erich Karkoschka|title=Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope|journal=Icarus|volume=151|pages=51–68|year=2001|doi=10.1006/icar.2001.6596| url=http://adsabs.harvard.edu/abs/2001Icar..151...51K]
single_temperature = ~64 K

Juliet "(jew'-lee-ət," IPAEng|ˈdʒuliət, or "jew'-lee-et'," IPA|/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. [cite web|last=Smith|first = B. A.|title=IAU Circular No. 4164|date=January 16 1986|url= http://cfa-www.harvard.edu/iauc/04100/04164.html#Item1|accessdate=2006-08-06] It is named after the heroine of William Shakespeare's play "Romeo and Juliet". It is also designated Uranus XI.cite web|title=Planet and Satellite Names and Discoverers|work=Gazetteer of Planetary Nomenclature|publisher= USGS Astrogeology|date=July 21 2006|url=http://planetarynames.wr.usgs.gov/append7.html|accessdate=2006-08-06]

Juliet belongs to Portia Group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita. These satellites have similar orbits and photometric properties. Unfortunately, other than its orbit, radius of 53 km and geometric albedo of 0.08 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. Its surface is grey in color.

Juliet may collide with Desdemona within the next 100 million years.cite journal
last=Duncan |first= Martin J.
coauthors=Jack J. Lissauer
title=Orbital Stability of the Uranian Satellite System
journal=Icarus
volume=125 |issue=1 |pages=1–12 |year=1997
doi=10.1006/icar.1996.5568
accessdate=2008-04-30
]

References

External links

* [http://solarsystem.nasa.gov/planets/profile.cfm?Object=Ura_Juliet Juliet Profile] by [http://solarsystem.nasa.gov NASA's Solar System Exploration]
* [http://www.astronomy.com/asy/objects/images/layton_uranus2_700.jpgJuliet + Ring diagram] (Courtesy of Astronomy Magazine 2005)


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