Statistics – Applications
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jbis...47...73b&link_type=abstract
British Interplanetary Society, Journal (ISSN 0007-094X), vol. 47, no. 2, p. 73-80
Statistics
Applications
9
Ballistics, Earth-Moon Trajectories, Gravitational Fields, Lunar Orbits, Chemical Propulsion, Electric Propulsion, Transfer Orbits
Scientific paper
A new type of Earth-Moon transfer is described which yields ballistic lunar capture for a spacecraft. It was discovered by Belbruno and Miller in 1990, and has been demonstrated by the Japanese spacecraft Hiten which reached the Moon in October 1991. The transfer is made possible by the existence of transition regions in the phase space due to the interaction of the gravitational fields of the Earth, Moon and Sun. These regions are termed fuzzy boundaries and were discovered by Belbruno in 1986. This transfer requires about 20% less delta-V as compared to a Hohmann transfer to place a payload into circular lunar orbit. When used together with a Pegasus rocket, significant science payloads can be inserted into lunar orbit. Another transfer is described which yields a 60% reduction in rendezvous delta-V when transferring to the Earth-Moon Lagrange points. This is applied to a proposed gravity wave interferometer mission. The use of a fuzzy boundary transfer is described in conjunction with a solar sail in order to put a spacecraft into lunar orbit without the use of rocket engines. Other applications are discussed.
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