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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.

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
22 Jan 2003: 
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Last Updated: 12 Aug 2013