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][3]
Orbital characteristics[4]
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's equator)
Satellite of	Uranus
Physical characteristics
Dimensions	150 × 74 × 74 km[5][note 1]
Surface area	~30,000 km2[a]
Volume	430100±23.0% km3[6]
Mass	(3.871±0.891)×1017 kg[6]
Mean density	≥0.61 g/cm3[6] ~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[5]
Axial tilt	zero[5]
Albedo	0.08 ± 0.01[7]
Temperature	~64 K[a]
Only two dimensions are known; the third dimension has been assumed to equal the smaller known dimension.

Juliet belongs to the 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,^[4] size of 150 × 74 km,^[5] and geometric albedo of 0.08,^[7] little is known about Juliet.

In Voyager 2 imagery, Juliet appears as an elongated object, with its major axis pointing towards Uranus. The ratio of axes of Juliet's prolate spheroid is 0.5 ± 0.3, which is a rather extreme value.^[5] Its surface is grey in color.^[5]

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

See also

• Moons of Uranus

Notes

1. Calculated on the basis of other parameters.