In this chapter, following a preliminary discussion of interplanetary trajectories, the concept of the sphere of influence, where the ratio of disturbing accelerations of the third bodies to the acceleration due to the central body, from the perspective of each of the central bodies, is equal, is introduced. The patched conic approximation is the first approximation that is usually considered in the mission planning as it provides an estimate of the velocity increment required for a particular mission and the estimate is quite accurate in a majority of the situations. These estimates provide an upper bound for the velocity increment required over the entire mission, which are useful for planning purposes. The methodology is largely based on an application of Hohmann two-impulse transfer. Also considered is the estimation of the phasing requirements and the times taken to complete the mission, although these may not be too accurate. Application examples to the Moon, a typical outer planet such as Mars and an inner planet such as Venus are also considered.


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    Multiple gravity assist interplanetary trajectories

    Labunsky, Alexei V. ;Papkov, Oleg V. ;Sukhanov, Konstantin G. | SLUB | 1998



    Optimum solar-sail interplanetary trajectories

    Sauer, C. G., Jr. | NTRS | 1976