Mass (kg)
 3.3 x 10^{23}

Diameter (km)
 4879.4

Mean density (kg/m^{3})
 5420

Escape velocity (m/s)
 4300

Average distance from Sun
 0.387 AU (57,909,175 km)

Rotation period (length of day in Earth days)
 58.65

Revolution period (length of year in Earth days)
 87.97

Obliquity (tilt of axis degrees)
 0

Orbit inclination (degrees)
 7

Orbit eccentricity (deviation from circular)
 0.206

Mean surface temperature (K)
 452

Maximum surface temperature (K)
 700

Minimum surface temperature (K)
 100

Visual geometric albedo (reflectivity)
 0.12

Largest known surface feature
 Caloris Basin
(1350 km diameter)

Atmospheric components
 trace amounts of
hydrogen and
helium

Surface materials 
basaltic and anorthositic rocks and regolith 