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
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
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
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
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
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 : 78.08% Nitrogen (N2), 20.95% 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 Numbers do not add up to exactly 100% due to roundoff and uncertainty Water is highly variable, typically makes up about 1%
Notes on the factsheets - definitions of parameters, units, notes on sub- and superscripts, etc.
Planetary Fact Table
- metric units
Planetary Fact Table
- U.S. units
Planetary Fact Table
- Earth ratio