Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aiaaj..15..518h&link_type=abstract
AIAA Journal, vol. 15, Apr. 1977, p. 518-525.
Astronomy and Astrophysics
Astronomy
Ballistic Trajectories, Lunar Launch, Space Colonies, Space Transportation, Trajectory Analysis, Astrodynamics, Guidance (Motion), Lagrangian Equilibrium Points, Mass Transfer, Space Commercialization, Space Manufacturing, Space Processing
Scientific paper
Flight-mechanics problems associated with large-scale transport of lunar mass to a space colony or manufacturing facility are discussed. The proposed transport method involves launch of payloads from a mass-driver on the lunar surface, onto ballistic trajectories to a passive mass-catcher located near the L2 libration point, with the caught mass subsequently being transported to the colony. Arrival velocities at L2, sensitivities in arrival dispersion due to launch errors, and effects of launch site location are treated, via numerically integrated orbits in the restricted three-body problem. From any launch site it is possible to define a target point reached with zero dispersion due to errors in a selected component of launch velocity. Effects of lunar geometrical librations and of obliquity, as well as the conditions for biasing a trajectory away from L2 so as to reduce stationkeeping costs, are dealt with along with transfer orbits from L2 to the colony. The theory of capture and the theory of resonance lead to a colony orbit, with period approximately two weeks, reached from L2 with velocity increment as low as 9.02 m/sec.
Heppenheimer T. A.
Kaplan David
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