| 词条 | Juliet (moon) |
| 释义 |
There is also an asteroid called 1285 Julietta.{{Infobox planet | name = Juliet | image = Julietmoon.png | discoverer = Stephen P. Synnott / Voyager 2 | discovered = January 3, 1986 | semimajor = 64,358.222 ± 0.048 km | eccentricity = 0.00066 ± 0.000087 | period = 0.493065490 ± 0.000000012 d | inclination = 0.06546 ± 0.040° (to Uranus' equator) | satellite_of = Uranus | dimensions = 150 × 74 × 74 km[5] | mean_radius = 46.8 ± 4 km[5][7][8] | surface_area = ~35,000 km²{{efn|name=calculated}} | volume = ~632,000 km³{{efn|name=calculated}} | mass = ~5.6{{E|17}} kg{{efn|name=calculated}} | density = ~1.3 g/cm³ (assumed)[7] | surface_grav = ~0.016 m/s2{{efn|name=calculated}} | escape_velocity = ~0.040 km/s{{efn|name=calculated}} | rotation = synchronous[5] | axial_tilt = zero[5] | albedo = 0.08 ± 0.01[12] | single_temperature = ~64 K{{efn|name=calculated}} }}Juliet ({{IPAc-en|ˈ|dʒ|uː|l|i|ə|t}} {{Respell|JOO|lee|ət}}, {{IPAc-en|ˌ|dʒ|uː|l|i|ˈ|ɛ|t}} {{respell|JOO|lee|ET}}) 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.[13] It is named after the heroine of William Shakespeare's play Romeo and Juliet. It is also designated Uranus XI.[14] Juliet belongs to Portia Group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Rosalind, Cupid, Belinda and Perdita.[12] These satellites have similar orbits and photometric properties.[12] Unfortunately, other than its orbit, radius of 53 km[5] and geometric albedo of 0.08[12] 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.[5] Its surface is grey in color.[5] Juliet may collide with Desdemona within the next 100 million years.[22] See also
ReferencesExplanatory notes{{notes| notes ={{efn | name = calculated | Calculated on the basis of other parameters. }} }}Citations 1. ^1 2 3 4 5 6 7 {{cite journal| doi = 10.1006/icar.2001.6597| last = Karkoschka| first = Erich| authorlink = Erich Karkoschka| year = 2001| title = Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellites| journal = Icarus| volume = 151| issue = 1| pages = 69–77| bibcode = 2001Icar..151...69K| ref = {{sfnRef|Karkoschka, Voyager|2001}}}} [1][2][3][4][5][6][7]2. ^1 2 {{cite web| publisher = JPL (Solar System Dynamics)| title = Planetary Satellite Physical Parameters| date = 24 October 2008| url = http://ssd.jpl.nasa.gov/?sat_phys_par| accessdate = 12 December 2008}} 3. ^1 {{cite web| last = Williams| first = Dr. David R.| date = 23 November 2007| title = Uranian Satellite Fact Sheet| publisher = NASA (National Space Science Data Center)| url = http://nssdc.gsfc.nasa.gov/planetary/factsheet/uraniansatfact.html| accessdate = 12 December 2008}} 4. ^1 2 3 4 {{cite journal| doi = 10.1006/icar.2001.6596| last = Karkoschka| first = Erich| authorlink = Erich Karkoschka| year = 2001| title = Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope| journal = Icarus| volume = 151| issue = 1| pages = 51–68| bibcode = 2001Icar..151...51K| ref = {{sfnRef|Karkoschka, Hubble|2001}}}} 5. ^1 {{cite journal| last = Smith| first = B. A.| title = Satellites of Uranus| journal = IAU Circular| volume = 4164| date = January 16, 1986| url = http://www.cbat.eps.harvard.edu/iauc/04100/04164.html#Item1| accessdate = 29 October 2011}} 6. ^1 {{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/Page/Planets| accessdate = 6 August 2006}} 7. ^1 {{cite journal| doi = 10.1006/icar.1996.5568| last1 = Duncan| first1 = Martin J.| last2 = Lissauer| first2 = Jack J.| year = 1997| title = Orbital Stability of the Uranian Satellite System| journal = Icarus| volume = 125| issue = 1| pages = 1–12| pmid = | pmc = | bibcode = 1997Icar..125....1D| ref = harv}} }} External links
3 : Moons of Uranus|Astronomical objects discovered in 1986|Romeo and Juliet |
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