Appendix 3: Table of Data for the Planet Mars

Orbital data   
Semimajor axis     227,940,000 km (1.52366 a.u.)   
Eccentricity    0.0934   
Inclination    1.8504°   
Longitude of ascending node    49.59°   
Longitude of perihelion    335.94°   
Mean orbital velocity    24.13 km/sec   
Mean synodic period    779.94 days   
Mean sidereal motion    0.5204°/day   
   

Physical elements   
Axial inclination    25.19°   
Length of sidereal day    24 hr, 37 min, 22.66 sec   
Mean orbital period    686.98 Earth days   
    669.60 Martian solar days   
Diameter    6,779.84 kilometers   
Polar compression    0.006   
Surface area (Earth = 1)    0.2825   
Volume (Earth = 1)    0.1504   
Mass (Earth = 1)    0.1074   
Density (water = 1)    3.93   
Mean escape velocity    5.027 km/sec   

Source: H. H. Kieffer, B. M. Jakosky, C. W. Snyder, and M. S. Matthews, eds., Mars (Tucson: University of Arizona Press, 1993).

Appendix 4: The Satellites of Mars

Phobos    Deimos       
Mean distance from Mars    9,378 km    23,459 km   
Sidereal period    7 hr, 39 min, 13.84 sec    30 hr, 17 min, 54.87 sec   
Eccentricity    0.0152    0.0002   
Inclination    1.03°    1.83°   
Diameter    13.3 x 11.1 x 9.3 km    7.6 x 6.2 x 5.4 km   

Source: H. H. Kieffer, B. M. Jakosky, C. W. Snyder, and M. S. Matthews, eds., Mars (Tucson: University of Arizona Press, 1993).© 1996 The Arizona Board of Regents