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Gravity Esc vel M.O.V Axial Ascend Peri- Equilib Surface Press Atmospheric Name (g) (km/s) (km/s) incl Oblate node helion (K) (K) (atm) Composition --------- ------- ------- ------ ------ ------ ------ ------ ------- ------- ------ ----------- Mercury 0.378 4.44 47.87 0 48.35 77.44 449 440 0 -- Venus 0.907 10.36 35.02 177.36 76.72 131.56 328 730 93 CO2, N2 Earth 1.000 11.19 29.79 23.45 .00335 354.90 102.83 279 287 1 N2, O2, Ar Mars 0.377 5.03 24.13 25.19 .00519 49.60 335.99 226 218 0.007 CO2, N2, Ar Jupiter 2.364 59.5 13.06 3.13 .06481 100.47 15.63 122 120 (x) H2, He Saturn 0.916 35.5 9.66 26.73 .1076 113.71 92.80 90 88 H2, He Uranus 0.889 21.3 6.80 97.86 .030 74.06 176.29 64 59 H2, He, CH4 Neptune 1.125 23.5 5.44 29.60 .026 131.81 1.95 51 48 H2, He, CH4 Pluto 0.067 1.3 4.74 122.52 110.42 224.59 44 37 1e-5 N2, CH4, CO Key: Gravity Equatorial surface gravity in g's (see also "Your Weight On Other Worlds") Esc vel Escape velocity in kilometers per second M.O.V. Mean Orbital Velocity in kilometers per second Axial incl Inclination of the rotation axis in degrees (obliquity) Oblate Oblateness Ascend Longitude of the ascending node Perihelion Longitude of perihelion Equilib Equilibrium temperature in Kelvins Surface Surface temperature in Kelvins Press Surface pressure in atmospheres Notes: (x) for the jovian planets "surface" refers to the cloud tops or 1 bar level Much more accurate and detailed data is available from JPL's Horizons telnet interface