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Orbital period

365.256363004 days

Average orbital speed

29.78 km/s(107200 km/h)

Mean sidereal day

23 hours, 56 minutes, 4.0916 seconds.

Mean radius

6371.0 km


6378.1 km


6356.8 km


40075.017 km (equatorial)

40007.86 km (meridional)

Surface area

510072000 km2

148940000 km2 (29.2%) land

361132000 km2 (70.8%) water


1.08321×1012 km3


5.97219×1024 kg(3.0×10-6solar mass)

Mean density

5.514 g/cm3

Surface gravity

9.807 m/s2

Escape velocity

11.186 km/s

Sidereal rotation period

0.99726968 d(23h 56m 4.100s)

Equatorial rotation velocity

1,674.4 km/h (465.1 m/s)

Axial tilt

23 degrees 26 min 21.4119 sec.

Surface pressure

101.325 kPa(at MSL)

Atmospheric Composition by volume

78.08% nitrogen(N2)(dry air)

20.95% oxygen(O2)

0.930% argon

0.039% carbon dioxide

~ 1% water vapor (climate-variable)

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