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Low energy trajectories to Mars via gravity assist from Venus to earthThe analytical determination of launch dates and proposed trajectories is reviewed with respect to the search for a low-energy trajectory to Mars with gravitational assist from Venus for the years 1995-2024. Both Ballistic and Venus-Earth gravity assist (VEGA) trajectories are calculated with an automated design tool by the authors (1990). The trajectories are modeled as conic sections from one gravitating body to the next, and gravity assist is considered to act impulsively. VEGA trajectories to Mars require similar launch energies for 6 years listed and have moderate arrival C3s, with the lowest C3 requirement in 2015. The flight time and arrival energies of the trajectories are found to be larger than those of ballistic trajectories, but the low-energy launch window makes them desirable for unmanned Mars missions, in particular.
Document ID
19910064227
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Williams, S. N.
(JPL Pasadena, CA, United States)
Longuski, J. M.
(Purdue University West Lafayette, IN, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Journal of Spacecraft and Rockets
Volume: 28
ISSN: 0022-4650
Subject Category
Astrodynamics
Accession Number
91A48850
Funding Number(s)
CONTRACT_GRANT: NGT-50499
Distribution Limits
Public
Copyright
Other

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