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Bulk parameters
                                   	
Mass (1024 kg)                       4.869
Volume (1010 km3)                   92.843
Equatorial radius (km)                6052
Polar radius (km)                     6052
Volumetric mean radius (km)           6052
Ellipticity                          0.000
Mean density (kg/m3)                  5204
Surface gravity (eq.) (m/s2)          8.87
Escape velocity (km/s)               10.36
GM (x 106 km3/s2)                   0.3249         
Bond albedo                           0.72           
Visual geometric albedo               0.65    
Visual magnitude V(1,0)              -4.40    
Solar irradiance (W/m2)               2660   
Black-body temperature (K)           238.9
Topographic range (km)                  15     
Moment of inertia (I/MR2)             0.33   
J2 (x 10-6)                          4.458      

Orbital parameters

Semimajor axis (106 km)              108.2
Sidereal orbit period (days)       224.701
Tropical orbit period (days)       224.695
Perihelion (106 km)                  107.5       
Aphelion (106 km)                    108.9       
Synodic period (days)               583.92  
Mean orbital velocity (km/s)         35.02
Orbit inclination (deg)                3.4        
Orbit eccentricity                  0.0068    
Sidereal rotation period (hrs)      5832.5 
Obliquity to orbit (deg)             177.3            

Atmosphere

Surface Pressure: 92 bars  
Surface Density: ~65. kg/m3 
Scale height: 15.9 km
Average temperature: 737 K
Diurnal temperature range: ~0 
Wind speeds: 0.3 to 1.0 m/s (surface)
Mean molecular weight: 43.45 g/mole
Atmospheric composition (near surface, by volume): 

Major:       96.5% Carbon Dioxide (CO2), 3.5% Nitrogen (N2) 

Minor (ppm): Sulfur Dioxide (SO2) - 150; Argon (Ar) - 70; Water (H2O) - 20;
                 Carbon Monoxide (CO) - 17; Helium (He) - 12; Neon (Ne) - 7

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