Portia (moon)
| Discovery | |
|---|---|
| Discovered by | Stephen P. Synnott / Voyager 2 |
| Discovery date | January 3, 1986 |
| Designations | |
Designation | Uranus XII |
| Pronunciation | /ˈpɔːrʃə/ |
| Adjectives | Portian /ˈpɔːrʃən/ |
| Orbital characteristics | |
| 66,097.265 ± 0.050 km | |
| Eccentricity | 0.00005 ± 0.00008 |
| 0.5131959201 ± 0.0000000093 d | |
Average orbital speed | 9.37 km/s |
| Inclination | 0.05908 ± 0.039° (to Uranus's equator) |
| Satellite of | Uranus |
| Group | ring shepherd |
| Physical characteristics | |
| Dimensions | 156 × 126 × 126 km |
| ~58 000 km2 | |
| Volume | 1296800±14.8% km3 |
| Mass | (1.1671±0.1730)×1018 kg |
Mean density | ≥0.57 g/cm3 ~0.90 g/cm3 (assumed) |
| ~0.013–0.02 m/s2 | |
| ~0.045–0.05 km/s | |
| synchronous | |
| zero | |
| Albedo |
|
| Temperature | ~64 K |
| |
Portia 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 1. The moon is named after Portia, the heroine of William Shakespeare's play The Merchant of Venice. It is also designated Uranus XII.
Portia is the second-largest inner satellite of Uranus after Puck. The Portian orbit, which lies inside Uranus's synchronous orbital radius, is slowly decaying due to tidal deceleration. The moon will one day either break up into a planetary ring or hit Uranus.
It is the namesake of a group of satellites called the Portia group, which includes Bianca, Cressida, Desdemona, Juliet, Rosalind, Cupid, Belinda, and Perdita. These satellites have similar orbits and photometric properties.
Little is known about Portia beyond its dimensions of about 156 × 126 km, orbit, and geometric albedo of about 0.08.
In Voyager 2 imagery, Portia appears as an elongated object whose major axis points towards Uranus. The ratio of axes of the Portia's prolate spheroid is 0.8 ± 0.1. Its surface is grey in color. Observations with Hubble Space Telescope and large terrestrial telescopes found water ice absorption features in the spectrum of Portia. Observations with James Webb Space Telescope have also found evidence for water ice or hydrated minerals on Portia's surface, and have also confirmed that Portia group members Juliet, Belinda, and Cressida have roughly similar spectra to Portia.