Sponsored by the Institute of Physics   Planets   Mercury   Venus   Earth   Mars   Jupiter   Saturn   Uranus     Rings     Miranda     Ariel     Umbriel     Titania     Oberon     Cordelia     Ophelia     Bianca     Cressida     Desdemona     Juliet     Portia     Rosalind     S/1986 U10     Belinda     Puck     Caliban     Stephano     Sycorax     Prospero     Setebos   Neptune   Pluto Asteroids Comets Constellations Sunrise and Sunset Times Moon Phases SI Units Symbols   Printer Version Astronomy Planets - Uranus Bulk Parameters | Orbital Parameters Observational Parameters | Atmospheric Parameters Satellites Bulk Parameters Mass 86.83 × 1024 kg Volume 6 833 × 1010 km3 Equatorial Radius (Defined by Pressure = 1 bar) 25 559 km Polar Radius (Defined by Pressure = 1 bar) 24 973 km Volumetric Mean Radius 25 362 km Ellipticity 0.023 Mean Density 1 318 kg m-3 Surface Gravity (At Pressure = 1 bar) 8.69 m s-2 Escape Velocity 21.3 km s-1 GM 5.794 × 106 km3 s-2 Bond Albedo 0.90 Visual Geometric Albedo 0.51 Visual Magnitude -7.19 Solar Irradiance 3.71 W m-2 Black-Body Temperature 35.9 K Moment of Inertia 0.225 I MR-2 Orbital Parameters Semimajor Axis 2 871.0 × 106 km Sidereal Orbit Period 30 685.4 days Tropical Orbit Period 30 588.740 days Perihelion 2 734.0 × 106 km Aphelion 3 005.2 × 106 km Synodic Period 369.66 days Mean Orbital Velocity 6.82 km s-1 Orbital Inclination 0.770 ° Orbital Eccentricity 0.047 18 Sidereal Rotation Period (Magnetic Coordinates, determined by Voyager 2 Radio Science Experiment) 17.24 hours Obliquity to Orbit 97.86 ° Observational Parameters Maximum Apparent Diameter from Earth 4.1 arc seconds Minimum Apparent Diameter from Earth 3.3 arc seconds Maximum Distance from Earth 3 157.3 × 106 km Minimum Distance from Earth 2 581.9 × 106 km Apparent Magnitude near Opposition 5.5 Atmospheric Parameters Surface Pressure Much more than 100 bars Average Temperature about 58 K Temperature at 1 bar about 76 K Density at 1 bar about 0.42 kg m-3 Scale Height 59.6 km Wind Speeds 0 to 200 m s-1 Scale Height 27.7 km Mean Molecular Weight 2.64 g mol-1 Molecular Hydrogen H2 89% Helium He 11% Methane CH4 Ammonia Ice Water Ice Ammonia Hydrosulphide Methane Ice Satellites Major Satellites Miranda Titania Ariel Oberon Umbriel Minor Satellites Cordelia S/1986 U10 Ophelia Belinda Bianca Puck Cressida Caliban Desdemona Stephano Juliet Sycorax Portia Prospero Rosalind Setebos Satellite S/1986 U10 is awaiting IAU certification. Prospero, Setebos and Stephano are provisional names.   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Shop | Contact | About   Page compiled: Wed Sep 05 18:38:01 GMT+01:00 2001