Monday, January 16, 2006


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 (453 oC)
Satellites: None
Visual geometric albedo: (reflectivity): 0.59
Highest point on surface: Maxwell Montes (17 km above mean planetary radius)
Atmospheric components: 96% carbon dioxide (CO2), 3% nitrogen (N), 0.1% water vapor (H2O(g))
Surface materials: basaltic rock and altered materials


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