Utilization of libration-point orbits, lunar gravity-assist, and Earth-return trajectories

Details Utilization of libration-point orbits, lunar gravity-assist, and Earth-return trajectories Utilization of libration-point orbits, lunar gravity-assist, and Earth-return trajectories

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994isaa.conf..238f&link_type=abstract

In Israel Society of Aeronautics and Astronautics, 34th Israel Annual Conference on Aerospace Sciences p 238-245 (SEE N94-35004

Astronomy and Astrophysics

Astronomy

Asteroid Missions, Comet Tails, Comets, Interplanetary Transfer Orbits, Libration, Lissajous Figures, Swingby Technique, Apsides, Halo Orbit Space Station, Lagrange Coordinates, Lunar Far Side, Orbital Resonances (Celestial Mechanics), Soho Mission

Scientific paper

An overview of some useful trajectory techniques for space missions in the Sun-Earth-Moon system is presented. Topics covered include libration-point orbits, lunar gravity-assist maneuvers, and Earth-return trajectories. The ISEE-3/ICE flight experience is used to illustrate the utility of a special class of libration-point orbits called 'halo orbits'. In the next five years, four scientific spacecraft, two from the United States, one from Russia and one from the European Space Agency, will be placed into halo orbits around the Sun-Earth L1 and L2 libration points. The Moon's gravitational field has a considerable effect in shaping spacecraft trajectories inside the Earth's sphere of influence. Lunar gravity-assist maneuvers have been used by three spacecraft so far: ISEE-E/ICE and two Japanese craft, Hiten and Geotail. In addition, plans exist for incorporating lunar gravity-assist maneuvers in a number of upcoming missions. The use of Earth-return trajectories to retarget interplanetary spacecraft is also described. This technique has been employed with great success in the Giotto extended mission to comet Grigg-Skjellerup and the Galileo mission to Jupiter. A proposed rendezvous mission to the near-Earth asteroid, 433 Eros, would also plan to use an Earth-return trajectory.

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