Mass (kg): 3.3 x 10²³

Diameter (km): 4879.4

Mean density (kg/m3): 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