When was the Uranus moon cordelia discovered?
The moon Cordelia, the closest to Uranus, was one of 11 moons discovered by the space probe Voyager 2, in January, 1986 (one, Perdita, was not recognized as a moon for another 13 years).
Titania (Not to be confused with Titan a moon of Saturn or Triton Neptune's moon) is the largest moon of Uranus. It's the eighth largest moon in the Solar System with a diameter of 1,578 km. It was discovered in 1787 by William Herschel on the same day he discovered Oberon another moon of Uranus. See link for more information.
That depends on the distance between Uranus and the orbiting body. The closer a body is to the body that it orbits, the faster the orbital speed. The closest of Uranus' moons, Cordelia, takes a little over 8 hours to orbit Uranus. The farthest moon orbiting Uranus, Ferdinand, takes about 7.7 Earth years to complete one orbit.
Titania and Oberon: 1787,Ariel and Umbriel: 1851, Miranda: 1948, Puck: 1985, Juliet, Portia, Cressida, Desdemona, Rosalind, Belinda, Cordelia, Ophelia and Bianca: 1986, Perdita was photographed in 1986 but not identified as a satellite of Uranus until 1999, Caliban and Sycorax: 1997, Setebos, Stephano and Prospero: 1999, Trinculo, Ferdinand and Francisco: 2001, Mab, Cupid and Margaret: 2003.