This is the Web Edition of "A Trip Into Space", a Coimbra-based electronic book on space science. Both the texts and the photos are by courtesy of National Aeronautics and Space Administration.
| This is the Web Edition of "A Trip Into Space", a Coimbra-based electronic book on space science. Both the texts and the photos are by courtesy of National Aeronautics and Space Administration.
|
A Trip Into Space  Fact Sheets Mars Fact Sheet |
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| See also: Notes On The Fact Sheets |   |
Mars Earth Ratio (Mars/Earth)
Mass (1024 kg) 0.64185 5.9736 0.107
Volume (1010 km3) 16.318 108.321 0.151
Equatorial radius (km) 3397 6378.1 0.533
Polar radius (km) 3375 6356.8 0.531
Volumetric mean radius (km) 3390 6371.0 0.532
Core radius (km) 1700 3485 0.488
Ellipticity (Flattening) 0.00648 0.00335 1.93
Mean density (kg/m3) 3933 5515 0.713
Surface gravity (m/s2) 3.69 9.78 0.377
Escape velocity (km/s) 5.03 11.19 0.450
GM (x 106 km3/s2) 0.04283 0.3986 0.107
Bond albedo 0.16 0.385 0.416
Visual geometric albedo 0.150 0.367 0.409
Visual magnitude V(1,0) -1.52 -3.86 -
Solar irradiance (W/m2) 589.2 1367.6 0.431
Black-body temperature (K) 216.6 247.3 0.875
Topographic range (km) 30 20 1.500
Moment of inertia (I/MR2) 0.366 0.3308 1.106
J2 (x 10-6) 1960.45 1082.63 1.811
Mars Earth Ratio (Mars/Earth)
Semimajor axis (106 km) 227.92 149.60 1.524
Sidereal orbit period (days) 686.980 365.256 1.881
Tropical orbit period (days) 686.973 365.242 1.881
Perihelion (106 km) 206.62 147.09 1.405
Aphelion (106 km) 249.23 152.10 1.639
Synodic period (days) 779.94 - -
Mean orbital velocity (km/s) 24.13 29.78 0.810
Max. orbital velocity (km/s) 26.50 30.29 0.875
Min. orbital velocity (km/s) 21.97 29.29 0.750
Orbit inclination (deg) 1.850 0.000 -
Orbit eccentricity 0.0935 0.0167 5.599
Sidereal rotation period (hrs) 24.6229 23.9345 1.029
Obliquity to orbit (deg) 25.19 23.45 1.074
Discoverer: Unknown
Discovery Date: Prehistoric
Distance from Earth
Minimum (106 km) 54.5
Maximum (106 km) 401.3
Apparent diameter from Earth
Maximum (seconds of arc) 25.7
Minimum (seconds of arc) 3.5
Mean values at opposition from Earth
Distance from Earth (106 km) 78.39
Apparent diameter (seconds of arc) 17.9
Apparent visual magnitude -2.0
Semimajor axis (AU) 1.52366231 Orbital eccentricity 0.09341233 Orbital inclination (deg) 1.85061 Longitude of ascending node (deg) 49.57854 Longitude of perihelion (deg) 336.04084 Mean Longitude (deg) 355.45332
Surface Pressure: ~6.1 mb (variable) [6.9 mb to 9 mb (Viking 1 Lander site)]
Surface Density: ~0.020 kg/m3
Scale height: 11.1 km
Average temperature: ~210 K
Diurnal temperature range: 184 K to 242 K (Viking 1 Lander site)
Wind speeds: 2-7 m/s (summer), 5-10 m/s (fall), 17-30 m/s (dust storm) (Viking Lander sites)
Mean molecular weight: 43.34 g/mole
Atmospheric composition (by volume):
Major : Carbon Dioxide (CO2) - 95.32% ; Nitrogen (N2) - 2.7%
Argon (Ar) - 1.6%; Oxygen (O2) - 0.13%; Carbon Monoxide (CO) - 0.08%
Minor (ppm): Water (H2O) - 210; Nitrogen Oxide (NO) - 100; Neon (Ne) - 2.5;
Hydrogen-Deuterium-Oxygen (HDO) - 0.85; Krypton (Kr) - 0.3;
Xenon (Xe) - 0.08
Phobos Deimos
Semi-major axis* (km) 9378 23459
Sidereal orbit period (days) 0.31891 1.26244
Siderial rotation period (days) 0.31891 1.26244
Orbital inclination (deg) 1.08 1.79
Orbital eccentricity 0.0151 0.0005
Major axis radius (km) 13.4 7.5
Median axis radius (km) 11.2 6.1
Minor axis radius (km) 9.2 5.2
Mass (1015 kg) 10.6 2.4
Mean density (kg/m3) 1900 1750
Geometric albedo 0.07 0.08
Visual magnitude V(1,0) +11.8 +12.89
Apparent visual magnitude (V0) 11.3 12.40
*Mean orbital distance from the center of Mars.
Last Update: 2004-Nov-27