Speaker
Dr
Daniel Garcia Yarnoz
(ISAS/JAXA)
Description
The use of multiple lunar swing-bys to pump up the hyperbolic escape velocity of interplanetary trajectories has been proposed in literature and repeatedly put into practice in real missions (*Kawaguchi et. al., 1995, Dunham et. al., 2007*). JAXA’s technology demonstrator mission DESTINY (*Kawakatsu et. al., 2013*), with its new main mission objective to fly by asteroid Phaethon, is planning to make use of a similar strategy to obtain the required escape velocity after a low-thrust spiralling phase from its launcher injection orbit.
This paper presents a systematic approach to design multiple lunar swing-by sequences that can be applied for this purpose. The Sun third-body perturbation plays an important role essentially providing free ${\Delta}v$ between lunar swing-bys. As a first step, an extension of the classical Tisserand graph in perigee-apogee radius is presented, in which the potential gains by solar perturbation between flybys can be estimated. Secondly, following an approach proposed by *Lantoine & McElrath* (*2014*), a database of Moon-to-Moon transfers is generated with a continuation method. A simplified planar circular restricted three-body problem is assumed. The families of transfers are stored parametrised as a function of initial Sun-Earth-Moon angle, lunar hyperbolic escape velocity modulus, and direction. In addition to the families calculated by *Lantoine & McElrath*, new families with multiple revolutions and families with energies close to libration point orbits are found and generated. The database can be accessed and transfers retrieved to quickly generate sequences in a similar fashion to a multiple swing-by classic Lambert problem solver, but including the effect of the Sun third body perturbation.
Two particular practical examples are presented: a sequence to be used for the DESTINY mission to escape the Earth-Moon system and initiate the transfer to asteroid Phaethon, and a solution to obtain a transfer to the Earth-Moon $L_2$ point.
| Applicant type | First author |
|---|
Primary author
Dr
Daniel Garcia Yarnoz
(ISAS/JAXA)
Co-authors
Prof.
Kawakatsu Yasuhiro
(ISAS/JAXA)
Stefano Campagnola
(JAXA/ISAS)
