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Additional Data

Appendix 1c: Solar System Data 3


Note: This data has been compiled from somewhat less reliable sources; do not use for life-critical applications!

Miscellaneous Data

									   
           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

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Bill Arnett; last updated: 2000 May 18