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Portia: Facts & Figures
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Discovered By
S. Synnott, Voyager 2
Date of Discovery
1986
Orbit Size Around Uranus (semi-major axis)
Metric: 66,100 km
English: 41,073 miles
Periapsis (closest)
Metric: 66,093 km
Apoapsis (farthest)
Metric: 66,107 km
Sidereal Orbit Period (Length of Year)
0.513 Earth days
Orbit Circumference
Metric: 415,318.55 km
Average Orbit Velocity
Metric: 33,732.8 km/h
Orbit Eccentricity
0.0001
Orbit Inclination
0.059 degree
Mean Radius
Metric: 67.6 km
Equatorial Circumference
Metric: 424.7 km
Volume
Metric: 1,293,983 km3
Mass
Metric: 1,681,505,981,935,050,000 kg
Scientific Notation: 1.6815 x 1018 kg
Density
Metric: 1.3 g/cm3
Surface Area
Metric: 57,425.30 km2
Surface Gravity
Metric: 0.025 m/s2
Escape Velocity
Metric: 207 km/h
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Last Updated: 7 Mar 2011