Stephano

Also known as Uranus XX, S/1999 U 2

moon of Uranus

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

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Encyclopedic overview

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.

Excerpted from Wikipedia’s “Stephano” article, available under the CC BY-SA 4.0 licence.