Discovery | |
---|---|
Discovered by | |
Discovery date | July 18, 1999 |
Designations | |
Designation | Uranus XX |
Pronunciation | /ˈstɛfənoʊ/ STEF-ən-oh[1][2] |
Adjectives | Stephanonian /ˌstɛfəˈnoʊniən/ STEF-ə-NOH-nee-ən[3] |
Orbital characteristics | |
Mean orbit radius | 8,004,000 km[4][5] |
Eccentricity | 0.2292[5] |
677.37 d | |
Inclination | 141.81° (to the ecliptic),144°[4] |
Satellite of | Uranus |
Group | Caliban group |
Physical characteristics | |
16 km (estimate)[6] | |
~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)[6] |
Temperature | ~65 K (estimate) |
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.[7][8][9][10][11]
Confirmed as Uranus XX, it was named after the drunken butler in William Shakespeare's play The Tempest in August 2000.[12]
The orbital parameters suggest that it may belong to the same dynamic cluster as Caliban, suggesting common origin.[13]
JPL
was invoked but never defined (see the help page).Sheppard et al. 2005 radius/albedo
was invoked but never defined (see the help page).Gladman Discovery 2000
was invoked but never defined (see the help page).IAUC 7230
was invoked but never defined (see the help page).IAUC 7248
was invoked but never defined (see the help page).IAUC 7385
was invoked but never defined (see the help page).IAUC 7473
was invoked but never defined (see the help page).IAUC 7479
was invoked but never defined (see the help page).Grav2003
was invoked but never defined (see the help page).