Mercure
Mass (kg)............................................3.3 x 10^23
Diameter (km)........................................4878
Mean density (kg/m^3) ...............................5420
Escape velocity (m/sec)..............................4300
Average distance from Sun (AU).......................0.387
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...................................0.206
Mean surface temperature (K).........................452
Maximum surface temperature (K)......................700
Minimum surface temperature (K)......................100
Visual geometric albedo..............................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
