Earth Fact Sheet

All this information came from a employee of NASA: David R Willams

Bulk parameters

Mass (1024 kg)                 5.9736

Volume (1010 km3)             108.321   

Equatorial radius (km)          6378    

Polar radius (km)               6356         

Volumetric mean radius (km)     6371

Core radius (km)                3485

Ellipticity                    0.0034       

Mean density (kg/m3)            5520      

Surface gravity (m/s2)          9.78      

Escape velocity (km/s)         11.186

GM (x 106 km3/s2)               0.3986      

Bond albedo                     0.385  

Visual geometric albedo         0.367

Visual magnitude V(1,0)        -3.86

Solar irradiance (W/m2)         1380     

Black-body temperature (K)       247.3    

Topographic range (km)            20

Moment of inertia (I/MR2)       0.3308

J2 (x 10-6)                    1082.63

Orbital parameters

Semimajor axis (106 km)         149.6     

Sidereal orbit period (days)    365.256

Tropical orbit period (days)    365.242    

Perihelion (106 km)             147.1         

Aphelion (106 km)               152.1

Mean orbital velocity (km/s)     29.79        

Orbit inclination (deg)           0.00      

Orbit eccentricity                0.0167     

Sidereal rotation period (hrs)   23.9345    

Obliquity to orbit (deg)         23.45

Earth Mean Orbital Elements (J2000)

Semimajor axis (AU)                  1.00000011  

Orbital eccentricity                 0.01671022   

Orbital inclination (deg)            0.00005  

Longitude of ascending node (deg)  -11.26064  

Longitude of perihelion (deg)      102.94719  

Mean Longitude (deg)               100.46435

Terrestrial Magnetosphere

    Dipole field strength: 0.3076 gauss-Re3

    Latitude/Longitude of dipole N: 78.6 degrees N/70.1 degrees W

    Dipole offset (planet center to dipole center) distance: 0.0725 Re

    Latitude/Longitude of offset vector: 18.3 degrees N/147.8 degrees E
Note: Re denotes Earth radii, 6,378 km

Terrestrial Atmosphere

Surface Pressure: 1014 mb

Surface Density: 1.217 kg/m3 

Scale height: 8.5 km

Average temperature:  288 K

Diurnal temperature range: 283 K to 293 K

Wind speeds: 0 to 100 m/s

Mean molecular weight: 28.97 g/mole 

Atmospheric composition (by volume, dry air): 

    Major      : 78.084% Nitrogen (N2), 20.946% Oxygen (O2), 

    Minor (ppm): Argon (Ar) - 9340; Carbon Dioxide (CO2) - 350

                 Neon (Ne) - 18.18; Helium (He) - 5.24; CH4 - 1.7

                 Krypton (Kr) - 1.14; Hydrogen (H2) - 0.55 

    Water is highly variable, typically makes up about 1%