uranus88Uranus Observational Parameters Discoverer: William Herschel Discovery Date: 13 March 1781 Distance from Earth Minimum (10 6 km) 2580.6 Maximum (10 6 km) 3153.5Uranus, seventh planet in distance from the Sun and the least massive of the solar system’s four giant, or Jovian, planets. Uranus has more than two dozen moons, five of which