Brown Printing
609 W. Glen, Peoria 61614

Mass (kg)........................................... 4.87 x 10^24
Diameter (km)....................................... 12104
Mean density (kg/m^3) .............................. 5250
Escape velocity (m/sec)............................. 10400

Average distance from Sun (AU)...................... 0.723
Rotation period (length of day) (in Earth days)..... 243.0 (retrograde)
Revolution period (length of year) (in Earth days).. 224.7

Obliquity (tilt of axis) (degrees).................. 178
Orbit inclination (degrees)......................... 3.39
Orbit eccentricity.................................. 0.007

Mean surface temperature (K)........................ 726

Visual geometric albedo............................. 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