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Astronomical Data



Orbital Period: 687 days (1.88 years)
Synodic Period: 780 days
Period of Axial Rotation: 24 hours, 37 minutes
Greatest Latitude: 6 51'
Mean Motion: 31' 27"
Diameter: 4217 miles (6787 km)
Volume (Earth = 1): 0.15
Mass (Earth = 1): 0.107
Density (water = 1): 3.94
Surface Gravity (Earth = 1): 0.38
Distance from Sun: 140 million miles (230 million km)
Distance from Earth 35 - 248 million miles
Temperature: From -87 to 17 C (-189 to 63 F)
Greatest Magnitude: -2.8
Number of Satellites: 2
Atmosphere: Very thin, mainly carbon dioxide with nitrogen and argon (traces of oxygen, krypton, neon, carbon monoxide, xenon and water vapour)


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