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Our Solar System

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Uranus

Orbital semi-major axis is 19.19 A.U. or 2871 million km.

 

Orbital eccentricity is 0.047.

 

Perihelion is 18.29 A.U. or 2736 million km.

 

Aphelion is 20.10 A.U. or 3006 million km.

 

Mean orbital speed is 6.80 km/s.

 

Sidereal orbital period of 83.75 tropical years or 369 .66 solar days.

 

Orbital inclination to ecliptic is 0.77*.

 

Greatest angular diameter, as seen from earth is 4.1".

 

Mass is 8.68, 1025 kg or 14.54 times that of Earth.

 

Equatorial radius is 25,559 km or 4.01 times that of Earth.

 

Mean density is 1271 kg/m3 or 0.230 times that of Earth.

 

Surface gravity is an incredible 8.87 m/s or 20.91 times that of Earth.

 

Escape speed is 21.3 km/s.

 

Sidereal rotation period is 0.72 solar days (retrograde).

 

Axial tilt is an incredible 97.92*.

 

Surface magnetic field is 0.74 times that of Earth.

 

Magnetic axis tilt relative to rotation axis is 58.6*.

 

Mean surface temperature is 58 k.

 

Number of moons: 17

 

Visited by Voyager 2 in 1986.

 

Atmosphere is 84 percent molecular hydrogen, 14 percent helium, and 2 percent Methane.

 

Magnetosphere is about 100 times stronger then Earth's.

 

Has a rocky core surrounded by a layer of metallic hydrogen.