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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 |
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| 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 ° |
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| 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 |
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| 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
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| 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 |
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89% |
| Helium He |
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11% |
| Methane CH4 |
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| Ammonia Ice |
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| Water Ice |
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| Ammonia Hydrosulphide |
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| Methane Ice |
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