Period of revolution (length of year)

30 685 Earth days or 84.01 Earth years

Rotation period

17 hours 14 minutes

Orbital velocity

24 516 km/h

Tilt of axis


Average temperature


Number of moons

at least 27


hydrogen, helium, methane

Strength of gravity

8.2 N/kg at surface

of the known solar system. Herschel also discovered the two largest moons of Uranus, Oberon and Titania.

Johann Bode, a German astronomer, named the planet Uranus after the Graeco-Roman god who personified the universe and was the father of Saturn. The planet was officially named Uranus in 1850.

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