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Solar System Exploration
Perdita: Facts & Figures
   Back to Uranus   Overview   Gallery   Facts & Figures   News 
Discovered By
Erich Karkoschka / Voyager 2
Date of Discovery
18 May 1999 (verified in Voyager 2 images dating back to January 18, 1986)
Orbit Size Around Uranus (semi-major axis)
Metric: 76,417 km
English: 47,483 miles
Periapsis (closest)
Metric: 75,531 km
Apoapsis (farthest)
Metric: 77,303 km
Sidereal Orbit Period (Length of Year)
0.001746749 Earth years
0.638 Earth days
Orbit Circumference
Metric: 480,126.02 km
Average Orbit Velocity
Metric: 31,356.2 km/h
Orbit Eccentricity
Orbit Inclination
Mean Radius
Metric: 15 ± 3 km
English: 9 ± 2 miles

Additional Information:

-USGS Astrogeology: Gazetteer of Planetary Nomenclature:

-JPL Solar System Dynamics:

-Encyclopedia of the Solar System, second edition; edited by Lucy-Ann McFadden, Paul R. Weissman, and Torrence V. Johnson; Academic Press 2007 -Spaceflight Now, 31 December 2001,
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Last Updated: 12 Aug 2013