Stephano (moon)
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.
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 | 8,004,000 km |
| Eccentricity | 0.2292 |
| 677.37 d | |
| Inclination | 141.81° (to the ecliptic),144° |
| Satellite of | Uranus |
| Physical characteristics | |
Mean radius | 16 km (estimate) |
| ~3,000 km2 (estimate) | |
| Volume | ~20,000 km3 (estimate) |
| Mass | ~2.2×1016 kg (estimate) |
Mean density | ~1.3 g/cm3 (assumed) |
| ~0.0041 m/s2 (estimate) | |
| ~0.013 km/s (estimate) | |
| ? | |
| ? | |
| Albedo | 0.04 (assumed) |
| Temperature | ~65 K (estimate) |
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.
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