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 Revised: June 21, 2016                 Mars                            499 / 4
 
 PHYSICAL DATA (updated 2019-Oct-29):
  Vol. mean radius (km) = 3389.92+-0.04   Density (g/cm^3)      =  3.933(5+-4)
  Mass x10^23 (kg)      =    6.4171       Flattening, f         =  1/169.779
  Volume (x10^10 km^3)  =   16.318        Equatorial radius (km)=  3396.19
  Sidereal rot. period  =   24.622962 hr  Sid. rot. rate, rad/s =  0.0000708822 
  Mean solar day (sol)  =   88775.24415 s Polar gravity m/s^2   =  3.758
  Core radius (km)      = ~1700           Equ. gravity  m/s^2   =  3.71
  Geometric Albedo      =    0.150                                              

  GM (km^3/s^2)         = 42828.375214    Mass ratio (Sun/Mars) = 3098703.59
  GM 1-sigma (km^3/s^2) = +- 0.00028      Mass of atmosphere, kg= ~ 2.5 x 10^16
  Mean temperature (K)  =  210            Atmos. pressure (bar) =    0.0056 
  Obliquity to orbit    =   25.19 deg     Max. angular diam.    =  17.9"
  Mean sidereal orb per =    1.88081578 y Visual mag. V(1,0)    =  -1.52
  Mean sidereal orb per =  686.98 d       Orbital speed,  km/s  =  24.13
  Hill's sphere rad. Rp =  319.8          Escape speed, km/s    =   5.027
                                 Perihelion  Aphelion    Mean
  Solar Constant (W/m^2)         717         493         589
  Maximum Planetary IR (W/m^2)   470         315         390
  Minimum Planetary IR (W/m^2)    30          30          30
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