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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 | |
| Mean orbit radius | 69,926.795 ± 0.053 km[3] |
| Eccentricity | 0.00011 ± 0.000103[3] |
| Orbital period | 0.558459529 ± 0.000000019 d[3] |
| Inclination | 0.27876 ± 0.045° (to Uranus' equator)[3] |
| Satellite of | Uranus |
| Group | ring shepherd |
| Physical characteristics | |
| Dimensions | 72 × 72 × 72 km[4] |
| Mean radius | 36 ± 6 km[4][5][6] |
| Surface area | ~16,000 km2[lower-alpha 1] |
| Volume | ~200,000 km3[lower-alpha 1] |
| Mass | ~2.5×1017 kg[lower-alpha 1] |
| Mean density | ~1.3 g/cm3 (assumed)[5] |
| ~0.012 m/s2[lower-alpha 1] | |
| ~0.031 km/s[lower-alpha 1] | |
| Rotation period | synchronous[4] |
| Axial tilt | zero[4] |
| Albedo | 0.08 ± 0.01[7] |
| Physics | ~64 K[lower-alpha 1] |
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.[8] 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.[9]
Rosalind belongs to Portia group of satellites, which also includes Bianca, Cressida, Desdemona, Portia, Juliet, Cupid, Belinda and Perdita.[7] These satellites have similar orbits and photometric properties.[7] Other than its orbit,[3] radius of 36 km[4] and geometric albedo of 0.08[7] virtually nothing is known about Rosalind.
In the Voyager 2 images 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.[10]
Explanatory notes
Citations