Key facts
- Discovered by
- John J. Kavelaars Brett J. Gladman Matthew J. Holman Jean-Marc Petit Hans Scholl
- Discovery date
- July 18, 1999
- Designation
- Uranus XX
- Pronunciation
- / ˈ s t ɛ f ən oʊ / STEF -ən-oh
- Adjectives
- Stephanonian / ˌ s t ɛ f ə ˈ n oʊ n i ə n / STEF -ə- NOH -nee-ən
- Mean orbit radius
- 7 951 400 km
- Orbital period sidereal
- 677 d
- Inclination
- 143.6° (to the ecliptic )
- Satellite of
- Uranus
- Group
- Caliban group
- Mean radius
- 16 km (estimate)
- Surface area
- ~3200 km (estimate)
- Volume
- ~17 000 km (estimate)
- Mass
- ~ 2.2 × 10 kg (estimate)
- Mean density
- ~1.3 g/cm (assumed)
- Surface gravity
- ~0.006 m/s (estimate)
- Escape velocity
- ~0.014 km/s (estimate)
- Synodic rotation period
- ?
via Wikipedia infobox
Article
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.