Computer Science – Performance
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986asdy.conf.1293y&link_type=abstract
IN: Astrodynamics 1985; Proceedings of the Conference, Vail, CO, August 12-15, 1985. Part 2 (A86-43201 20-12). San Diego, CA, Un
Computer Science
Performance
Gravitational Effects, Mercury (Planet), Payload Delivery (Sts), Planetary Orbits, Space Transportation System, Venus (Planet), Circular Orbits, Flyby Missions, Launch Vehicles, Liquid Rocket Propellants, Performance Tests, Space Missions, Spacecraft Trajectories, Swingby Technique
Scientific paper
It is shown that it is possible to deliver a payload of 600 to 2000 kg to a 300-km circular orbit at Mercury using presently available NASA Space Transportation Systems and a single-stage bipropellant chemical rocket. This superior payload performance is attained by swingbys of Venus, plus (more importantly), the use of the reverse Delta-V/EGA process. In contrast to the Delta-V/EGA process (used to boost the launch energy by returning to earth for a gravity assist), the reverse Delta-V/EGA process reduces the Mercury approach energy each time a spacecraft makes a near-resonant return to Mercury for a gravity assist and reduces the orbit-capture Delta-V requirement. The mission sequences for such high-performance missions are described, and example mission opportunities for the years 1990 to 2010 are presented.
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