Kawaguchi, Jun'ichiroKimura, MasafumiYamakawa, HiroshiUesugi, TonoMatsuo, HirokiFarquhar, Robert W.2026-01-042026-01-0408770338030065-3438ORCID:/0000-0001-8196-5194/work/162948060https://hdl.handle.net/1885/733803592PLANET-B is a Mars orbiter mission currently under fabrication in ISAS (Institute of Space and Astronautical Science, Japan), whose launch is scheduled in either 1996 or 1998 as a backup. ISAS is planning to make it fly boosted by means of multiple lunar swingbys and its design and results are presented here. This paper presents an universal design chart for the interplanetary spacecraft that may utilize such lunar gravity assist, based on which swingby point is determined. As a verify practical illustration of this scheme, this provides with rigorous trajectory example that is currently a baseline for PLANET-B spacecraft.14en19930027767025