Analysis of spacecraft entry into Mars atmosphere

Details Analysis of spacecraft entry into Mars atmosphere Analysis of spacecraft entry into Mars atmosphere

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991fsa..worku....n&link_type=abstract

In NASDA, Future Space Activities Workshop: Lunar Base Workshop 1991 23 p (SEE N92-33753 24-91)

Physics

Aerodynamic Characteristics, Flight Mechanics, Hypersonic Reentry, Mars (Planet), Mars Atmosphere, Mars Landing, Mars Probes, Space Exploration, Spacecraft Reentry, Aerodynamic Heating, Atmospheric Density, Atmospheric Models, Atmospheric Temperature, Dynamic Pressure, Flight Paths, Flight Time, Mariner Space Probes, Viking Orbiter Spacecraft

Scientific paper

The effects on a spacecraft body while entering the Martian atmosphere and the resulting design constraints are analyzed. The analyses are conducted using the Viking entry phase restriction conditions and a Mars atmosphere model. Results from analysis conducted by the Program to Optimize Simulated Trajectories (POST) are described. Results obtained from the analysis are as follows: (1) flight times depend greatly on lift-to-drag ratio and less on ballistic coefficients; (2) terminal landing speeds depend greatly on ballistic coefficients and less on lift-to-drag ratios; (3) the dependence of the flight path angles on ballistic coefficients is slightly larger than their dependence on lift-to-drag ratios; (4) as the ballistic coefficients become smaller and the lift-to-drag ratios become larger, the deceleration at high altitude becomes larger; (5) small ballistic coefficients and low lift-to-drag ratios are required to meet the constraints of Mach number at parachute deployment and deployment altitude; and (6) heating rates at stagnation points are dependent on ballistic coefficients. It is presumed that the aerodynamic characteristics will be 0.2 for the lift-to-drag ratio and 75 kg/sq m for the ballistic coefficient for the case of a Mars landing using capsules similar to those used in the Viking program.

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