The Antoniadi Ridge of Mercury

Mercury Data and Statistics:
Mass (kg) = 3.303e+23
Mass (Earth = 1) = 5,5271e-02
Equatorial radius = 2.439,7 Km
Equatorial radius (Earth = 1) = 3,8252e-01
Mean density (gm/cm^3) = 5,42
Mean distance from the Sun = 57.910.000 Km
Mean distance from the Sun (Earth = 1) = 0,3871
Rotational period (days) = 58,6462
Orbital period (days) = 87,969
Mean orbital velocity = 47,88 Km per second
Tilt of axis = 0,00°
Orbital inclination = 7,004°
Equatorial surface gravity (m/sec^2) = 2,78
Equatorial escape velocity = 4,25 Km per second
Magnitude (Vo) = - 1.9
Mean surface temperature = 179°C
Maximum surface temperature = 427°C
Minimum surface temperature = - 173°C
Atmospheric composition: Helium 42%, Sodium 42%, Oxygen 15%, Other 1%