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2. Mission scenario
The juxtaposed conics method highlights the phenomenon of gravitational assistance, which provides "free" speed gains in heliocentric reference frames. Propulsive maneuvers are required when gravitational assistance is insufficient. This section presents the concepts used for the preliminary optimization of an interplanetary mission scenario.
2.1 Side-by-side conics
The interplanetary trajectory is modelled as a succession of conics connecting at the boundaries of the spheres of influence
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