Cressida, Portia and Ophelia

Portia is the seventh moon in order of distance from Uranus. It is named after Portia, the heroine of Shakespeare's play The Merchant of Venice, and is also known as Uranus XII. Portia was discovered by Voyager scientist Stephen P. Synnott from images sent back by Voyager 2 on January 3, 1986 and was given the temporary designation S/1986 U1.


discovery 1986, by Voyager 2
semimajor axis 66,090 km (41,080 miles)
diameter 156 × 126 km (97 × 78 miles)
orbital period 0.513 days (12 hr 19 min.)
orbital eccentricity 0.0001
orbital inclination 0.087°
visual albedo 0.07 (assumed)