The planet Uranus has a radius of 25,360 km and a surface acceleration due to gravity of 9.0 m/s² at its poles. Its moon Miranda (discovered by Kuiper in 1948) is in a circular orbit about Uranus at an altitude of 104,000 km above the planet's surface. Miranda has a mass of 6.6×10¹⁹ kg and a radius of 236 km. Calculate the mass of Uranus from the given data.