We develop a framework based on energy kicks for the evolution of high-eccentricity long-period orbits with Jacobi constant close to 3 in the restricted circular planar three-body problem where the secondary and primary masses have mass ratio \mu \ll 1 .
We use this framework to explore mean-motion resonances between the test particle and the secondary mass .
This approach leads to ( i ) a redefinition of resonance orders to reflect the importance of interactions at periapse ; ( ii ) a pendulum-like equation describing the librations of resonance orbits ; ( iii ) an analogy between these new fixed points and the Lagrangian points as well as between librations around the fixed points and the well known tadpole and horseshoe orbits ; ( iv ) a condition a \sim \mu ^ { -2 / 5 } for the onset of chaos at large semimajor axis a ; ( v ) the existence of a range \mu < \sim 5 \times 10 ^ { -6 } in secondary mass for which a test particle initially close to the secondary can not escape from the system , at least in the planar problem ; ( vi ) a simple explanation for the presence of asymmetric librations in exterior 1 :N resonances .