Cressida . Uranus IX - 1986U3 . Cressida was named after the daughter of Calchas in Shakespeare's play Troilus and Cressida . It is the forth satellite out from Uranus and was discovered by Voyager 2 . Cressida Statistics . Discovered by . ... Equatorial radius (km) . ... Equatorial radius (Earth = 1) . ... Mean density (gm/cm^3) . Mean distance from Uranus (km) . ... Rotational period (days) . Orbital period (days) . ... Mean orbital velocity (km/sec) . ...