Earth Fact Sheet

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Bulk parameters

Mass (1024 kg)                 5.9736
Volume (1010 km3)             108.321  
Equatorial radius (km)         6378.1   
Polar radius (km)               6356.8        
Volumetric mean radius (km)     6371.0
Core radius (km)                3485
Ellipticity (Flattening)        0.00335     
Mean density (kg/m3)            5515     
Surface gravity (m/s2)          9.798 
Surface acceleration (m/s2)     9.780       
Escape velocity (km/s)         11.186
GM (x 106 km3/s2)               0.3986     
Bond albedo                     0.306 
Visual geometric albedo         0.367
Visual magnitude V(1,0)        -3.86
Solar irradiance (W/m2)         1367.6   
Black-body temperature (K)       254.3   
Topographic range (km)            20
Moment of inertia (I/MR2)       0.3308
J2 (x 10-6)                    1082.63     
Number of natural satellites       1         
Planetary ring system             No

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Orbital parameters

Semimajor axis (106 km)         149.60   
Sidereal orbit period (days)    365.256
Tropical orbit period (days)    365.242   
Perihelion (106 km)             147.09       
Aphelion (106 km)               152.10
Mean orbital velocity (km/s)     29.78       
Max. orbital velocity (km/s)     30.29
Min. orbital velocity (km/s)     29.29
Orbit inclination (deg)           0.000    
Orbit eccentricity                0.0167    
Sidereal rotation period (hrs)   23.9345   
Length of day (hrs)              24.0000
Obliquity to orbit (deg)         23.45    

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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

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North Pole of Rotation

Right Ascension:  0.00 - 0.641T
Declination    : 90.00 - 0.557T
Reference Date : 12:00 UT 1 Jan 2000 (JD 2451545.0)
T = Julian centuries from reference date

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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

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Terrestrial Atmosphere

Surface pressure: 1014 mb
Surface density: 1.217 kg/m3
Scale height: 8.5 km
Total mass of atmosphere:  5.1 x 1018 kg
Total mass of hydrosphere:  1.4 x 1021 kg
Average temperature:  288 K (15 C)
Diurnal temperature range: 283 K to 293 K (10 to 20 C)
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) - 380
                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%

source:http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html