| Mass (kg)
| 1.90 x 1027 |
| Diameter (km)
| 142,800 |
| Mean density (kg/m3)
| 1314 |
| Escape velocity (m/s)
| 59500 |
| Average distance from Sun
| 5.203 AU (778,412,020 km) |
| Rotation period (length of day in Earth days)
| 0.41 (9.8 Earth hours) |
| Revolution period (length of year in Earth years)
| 11.86 |
| Obliquity (tilt of axis degrees)
| 3.08 |
| Orbit inclination (degrees)
| 1.3 |
| Orbit eccentricity (deviation from circular)
| 0.048 |
| Mean surface temperature (K)
| 120 (cloud tops) |
| Visual geometric albedo
(reflectivity)
| 0.44 |
| Atmospheric components
| 90% hydrogen,
10% helium,
.07% methane |
| Rings
| Faint ring.
Infrared spectra imply dark rock fragments.
|