Rosalind (moon)

Rosalind is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 13 January 1986, and was given the temporary designation S/1986 U 4.^[9] It was named after the daughter of the banished Duke in William Shakespeare's play As You Like It. It is also designated Uranus XIII.^[10]

There is also an asteroid called 900 Rosalinde.

Rosalind

The Hubble Space Telescope captured tiny Rosalind orbiting Uranus in 1997
Discovery
Discovered by	Stephen P. Synnott / Voyager 2
Discovery date	January 13, 1986
Designations
Designation	Uranus XIII
Pronunciation	/ˈrɒzələnd/[1]
Adjectives	Rosalindian /rɒzəˈlɪndiən/[2]
Orbital characteristics[3]
Semi-major axis	69,926.795 ± 0.053 km
Eccentricity	0.00011 ± 0.000103
Orbital period (sidereal)	0.558459529 ± 0.000000019 d
Inclination	0.27876 ± 0.045° (to Uranus's equator)
Satellite of	Uranus
Group	ring shepherd
Physical characteristics
Dimensions	72 × 72 × 72 km[4][note 1]
Mean radius	36 ± 6 km[5][6]
Surface area	~16 000 km2[a]
Volume	~200 000 km3[a]
Mass	~(0.98–2.3)×1017 kg[a]
Mean density	0.5–1.2 g/cm3[7]
Surface gravity	~0.005–0.012 m/s2[a]
Escape velocity	~0.019–0.029 km/s[a]
Synodic rotation period	synchronous[4]
Axial tilt	zero[4]
Albedo	0.08 ± 0.01[8]
Temperature	~64 K[a]
Only two dimensions are known; the third dimension has been assumed to equal the other two.

Rosalind belongs to Portia group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Belinda, and Perdita.^[8] These satellites have similar orbits and photometric properties.^[8] Other than its orbit,^[3] radius of 36 km,^[4] and geometric albedo of 0.08,^[8] little is known about Rosalind.

In Voyager 2 imagery, Rosalind appears as an almost spherical object. The ratio of axes of Rosalind's prolate spheroid is 0.8–1.0.^[4] Its surface is grey in color.^[4]

Rosalind is very close to a 3:5 orbital resonance with Cordelia.^[11]

See also

• Moons of Uranus

Notes

1. Calculated on the basis of other parameters.