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The overlapping of mean-motion resonances is useful for low orzero-propellant space mission design, but while most related prior work uses aplanar CRTBP model, tours of multi-moon systems require using resonancesaffected by two moons. In this case study, we investigate Jupiter-Ganymedeunstable 4:3 resonant orbits in a concentric circular restricted 4-bodyJupiter-Europa-Ganymede model. We show that despite their high order, secondaryresonances between the 4:3 orbits and Europa have a large effect, including11/34, 12/37, 23/71, and 25/77. Computing newly generated objects inside thesecondary resonances definitively confirms their overlap, which causes acomplete structural change of the higher-energy unstable 4:3 orbits whosemanifolds are most useful for low-TOF orbit transfers. We believe thisphenomenon is general, with major implications for resonant orbit use in tourdesign.

4th Body-Induced Secondary Resonance Overlapping Inside Unstable Resonant Orbit Families: a Jupiter-Ganymede 4:3 + Europa Case Study