Quick facts
Parent planet
Diameter (mean)
32 km
Mass
2.2 × 10¹⁶ kg
3e-07 Moon masses
Mean orbital radius
8,004,000 km
Orbital period
677.5 Earth days
Discovery year
1999
Discoverer
Brett J. Gladman, Matthew J. Holman et al.
Naming origin
Drunken butler in The Tempest
Surface conditions
Stephano is a retrograde outer irregular Uranian moon.
Missions and observations
Every Uranus-system mission has had an opportunity to image or characterize Stephano. The list below is the Uranus-system mission catalog; specific Stephano encounters are documented in mission archives.
| Mission | Year at Uranus | Status |
|---|---|---|
|
Voyager 2 NASA |
1986 | Completed |
Naming etymology
Stephano was a drunken butler in Shakespeare's The Tempest. Adopted by the IAU in 2001.
Methodology & sources
Diameter, mass, and orbital parameters from JPL Solar System Dynamics — Physical Parameters. Discovery year and discoverer from the JPL Satellite Discovery Circumstances. Naming etymology from the IAU Working Group for Planetary System Nomenclature. Stylized SVG hero composed from NASA / JPL imagery as visual reference; no photographs are reproduced.