PLANETARY DATA: URANUS

Orbital semi-major axis 19.19 A.U.
2871 million km
Orbital eccentricity 0.047
Perihelion 18.29 A.U.
2736 million km
Aphelion 20.10 A.U.
3006 million km
Mean orbital speed 6.80 km/s
Sidereal orbital period 83.75 tropical years
Synodic orbital period 369 .66 solar days
Orbital inclination to the ecliptic 0.77°
Greatest angular diameter, as seen from Earth 4.1"
Mass 8.68 1025 kg
14.54 (Earth = 1)
Equatorial radius 25,559 km
4.01 (Earth = 1)
Mean density 1271 kg/m3
0.230 (Earth = 1)
Surface gravity* 8.87 m/s2
0.91 (Earth = 1)
Escape speed 21.3 km/s
Sidereal rotation period —0.72 solar days (retrograde)
Axial tilt** 97.92°
Surface magnetic field 0.74 (Earth = 1)
Magnetic axis tilt relative to rotation axis 58.6°
Mean surface temperature 58 K
Number of moons 17