Astronomy Planets - Earth Bulk Parameters | Orbital Parameters Mean Orbital Parameters (J2000) | Magnetospheric Parameters Atmospheric Parameters | Satellites   Bulk Parameters Mass 5.9736 × 1024 kg Volume 108.321 × 1010 km3 Equatorial Radius 6378.1 km Polar Radius 6356.8 km Volumetric Mean Radius 6371.0 km Core Radius 3485 km Ellipticity 0.00335 Mean Density 5515 kg m-3 Surface Gravity 9.78 m s-2 Escape Velocity 11.186 km s-1 GM 0.3986 × 106 km3 s-2 Bond Albedo 0.306 Visual Geometric Albedo 0.367 Visual Magnitude (V(1,0)) -3.86 Solar Irradiance 1367.6 W m-2 Black-Body Temperature 254.3 K Moment of Inertia 0.3308 I MR-2 J2 1082.63 × 10-6 Topographic Range 20 km Orbital Parameters Semimajor Axis 149.60 × 106 km Sidereal Orbit Period 365.256 days Tropical Orbit Period 365.242 days Perihelion 147.09 × 106 km Aphelion 152.10 × 106 km Mean Orbital Velocity 29.78 km s-1 Maximum Orbital Velocity 30.29 km s-1 Minimum Orbital Velocity 29.29 km s-1 Orbital Inclination 0.000 ° Orbital Eccentricity 0.0167 Sidereal Rotation Period 23.9345 hours Length of Day 24.0000 hours Obliquity to Orbit 23.45 bgcolor="#FFFF00"> Mean Orbital Elements (J2000) Semimajor Axis 1.00000011 AU Orbital Eccentricity 0.01671022 Orbital Inclination 0.00005° Longitude of Ascending Node -11.26064° Longitude of Perihelion 102.94719° Mean Longitude 100.46435° Magnetospheric Parameters Dipole Field Strength 0.3076 gauss-Re3 [*] Latitude of Dipole North 78.6° N Longitude of Dipole North 70.1° W Dipole Offset (planet centre to dipole centre) distance 0.0725 Re [*] Latitude of Offset Vector 18.3° N Longitude of Offset Vector 147.8° E [*] Re = Earth Radii (6378.1 km) Atmospheric Parameters Surface Pressure 1014 mbar Surface Density 1.217 kg m-3 Scale Height 8.5 km Average Temperature 288 K Diurnal Temperature Range 283 K to 293 K Surface Wind Speeds 0 to 100 m s-1 Mean Molecular Weight 28.97 g mol-1 Nitrogen N2 78.084% Oxygen O2 20.946% Water H2O 1% Argon Ar 0.934% Carbon Dioxide CO2 0.035% Neon Ne 18.18 ppm Helium He 5.24 ppm CH4 1.7 ppm Krypton Kr 1.14 ppm Hydrogen H2 0.55 ppm Satellites Moon

Page compiled: Wed Sep 05 18:37:58 GMT+01:00 2001