Stephano (moon)
Discovery image of Stephano (encircled) | |
| Discovery | |
|---|---|
| Discovered by | |
| Discovery date | July 18, 1999 |
| Designations | |
Designation | Uranus XX |
| Pronunciation | /ˈstɛfənoʊ/ STEF-ən-oh |
| Adjectives | Stephanonian /ˌstɛfəˈnoʊniən/ STEF-ə-NOH-nee-ən |
| Orbital characteristics | |
Mean orbit radius | 7 951 400 km |
| Eccentricity | 0.235 |
| 677 d | |
| Inclination | 143.6° (to the ecliptic) |
| Satellite of | Uranus |
| Group | Caliban group |
| Physical characteristics | |
| 16 km (estimate) | |
| ~3200 km2 (estimate) | |
| Volume | ~17 000 km3 (estimate) |
| Mass | ~2.2×1016 kg (estimate) |
Mean density | ~1.3 g/cm3 (assumed) |
| ~0.006 m/s2 (estimate) | |
| ~0.014 km/s (estimate) | |
| ? | |
| ? | |
| Albedo | 0.04 (assumed) |
| Temperature | ~65 K (estimate) |
Spectral type | B–V = 0.97 ± 0.07, V–R = 0.66 ± 0.05 |
Stephano (/ˈstɛfənoʊ/ STEF-ən-oh) is a retrograde irregular satellite of Uranus. It was discovered by Brett J. Gladman, et al. in 1999, and given the provisional designation S/1999 U 2.
Confirmed as Uranus XX, it was named after the drunken butler in William Shakespeare's play The Tempest in August 2000.
The orbital parameters suggest that it may belong to the same dynamic cluster as Caliban, suggesting common origin.