Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992asdy.conf.1513h&link_type=abstract
IN: Astrodynamics 1991; Proceedings of the AAS/AIAA Astrodynamics Conference, Durango, CO, Aug. 19-22, 1991. Pt. 2 (A92-43251 18
Astronomy and Astrophysics
Astronomy
Earth-Mars Trajectories, Earth-Moon System, Interplanetary Flight, Lunar Gravitation, Swingby Technique, Galileo Project, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
Single and double lunar swingbys have previously been suggested for earth escape missions. This paper investigates the payload gain available from single and double lunar gravity assists. The gain available from a powered earth flyby used in conjunction with a double lunar gravity assist is also discussed. This paper also examines return to the earth-moon system for a third lunar gravity assist and the payload gain that results. Use of these methods allows a spacecraft to depart earth with an energy less than that needed to escape and to proceed on to planetary encounters. Opportunities for travel to Mars using these methods are presented. Fairly regular opportunities exist that result in payload gain. The main problem is that launch windows are rather restrictive. Mission scenarios where this procedure may be useful are presented.
Deaton A. W.
Hanson John M.
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