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Portia: Overview
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Color image showing moons orbiting Uranus.
A Hubble Space Telescope image of Uranus and its rings and moons taken in 1997.

Very little is known about Uranus' small and fast-moving moon Portia. It is known that Portia has a diameter of 140 km, making it one of the largest of Uranus' lesser satellites. It is also known that Portia orbits Uranus in less than one Earth day.

Discovery:
Portia was discovered January 1986 in images sent back by the Voyager 2 spacecraft during its flyby of Uranus.

How Portia Got its Name:
This moon is named after Portia, the heroine of William Shakespeare's 16th century play "The Merchant of Venice." It was originally designated S/1986 U 1.

Moons of Uranus are named for characters in William Shakespeare's plays and from Alexander Pope's "Rape of the Lock."

Just the Facts
Orbit Size (semi-major axis):  66,100 km
Mean Radius:  67.6 km
Volume:  1,293,983 km3
Mass:  1,681,505,981,935,050,000 kg
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Last Updated: 12 Aug 2013