Mars free returns via gravity assist from Venus

Masataka Okutsu, James M. Longuski

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The safety of the crew is the top priority for human exploration of Mars. If an unexpected emergency occurs, a free-return trajectory can bring the spacecraft back to the Earth without a large trajectory correction maneuver. Such mission-abort scenarios are analyzed by searching for various Mars free-return trajectories, including gravity assist from Venus en route. Thorough investigations of Earth-Mars-Earth, Earth-Mars-Venus-Earth, and Earth-Venus-Mars-Earth sequences are made for the 15-year launch window beginning in 2010. Out of this study, a Mars-Venus free-return abort option, which satisfies the energy and time-of-flight constraints of NASA's Design Reference Mission in January 2014, is discovered. If aerogravity assist (consistent with the capability of the Design Reference Mission vehicle) is employed at Mars, the abort option can be improved over pure gravity assist at Mars in terms of more launch opportunities and lower time of flight. The planned mission date in January 2014 is remarkably fortuitous because the Mars-Venus abort trajectory only repeats every 32 years.

Original languageEnglish (US)
Pages (from-to)31-36
Number of pages6
JournalJournal of Spacecraft and Rockets
Volume39
Issue number1
DOIs
StatePublished - Jan 1 2002

Fingerprint

Venus (planet)
Venus
mars
Mars
Gravitation
Earth (planet)
gravity
gravitation
Trajectories
trajectory
abort trajectories
swingby technique
launch windows
trajectories
crews
NASA
Spacecraft
emergencies
maneuvers
safety

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

Cite this

Okutsu, Masataka ; Longuski, James M. / Mars free returns via gravity assist from Venus. In: Journal of Spacecraft and Rockets. 2002 ; Vol. 39, No. 1. pp. 31-36.
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Mars free returns via gravity assist from Venus. / Okutsu, Masataka; Longuski, James M.

In: Journal of Spacecraft and Rockets, Vol. 39, No. 1, 01.01.2002, p. 31-36.

Research output: Contribution to journalArticle

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