Planetary data for Earth
Table
Planetary data for Earth
mean distance from Sun 149,600,000 km (1.0 AU)
eccentricity of orbit 0.0167
inclination of orbit to ecliptic 0.000°
Earth year (sidereal period of revolution) 365.256 days
mean orbital velocity 29.79 km/sec
equatorial radius 6,378.14 km
polar radius 6,356.78 km
surface area 510,066,000 km2
mass 5.976 × 1024 kg
mean density 5.52 g/cm3
mean surface gravity 980 cm/sec2
escape velocity 11.2 km/sec
rotation period (Earth sidereal day) 23.9345 hr (23 hr 56 min 4 sec) of mean solar time
Earth mean solar day 24.0657 hr (24 hr 3 min 57 sec) of mean sidereal time
inclination of Equator to orbit 23.45°
magnetic field strength at Equator 0.3 gauss (but weakening)
dipole moment 7.9 × 1025 gauss/cm3
tilt angle of magnetic axis 11.5°
atmospheric composition (by volume) molecular nitrogen, 78%; molecular oxygen, 21%; argon, 0.93%; carbon dioxide, 0.037% (presently rising); water, about 1% (variable)
mean surface pressure 1 bar
mean surface temperature 288 K (59 °F, 15 °C)
number of known moons 1 (the Moon)
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