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| Mass (kg) | 4.87 x 1024 |
| Diameter (km) | 12104 |
| Mean density (kg/m3) | 5250 |
| Escape velocity (m/s) | 10400 |
| Average distance from Sun | 0.723 AU (108,208,930 km) |
| Rotation period (length of day in Earth days) | 243.02 (retrograde) |
| Revolution period (length of year in Earth days) | 224.7 |
| Obliquity (tilt of axis degrees) | 178 |
| Orbit inclination (degrees) | 3.39 |
| Orbit eccentricity (deviation from circular) | 0.007 |
| Mean surface temperature (K) | 726 |
| Visual geometric albedo (reflectivity) | 0.59 |
| Highest point on surface | Maxwell Montes (17 km above mean planetary radius) |
| Atmospheric components | 96% carbon dioxide, 3% nitrogen, 0.1% water vapor |
| Surface materials | basaltic rock and altered materials |
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