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A halo orbit is a periodic , three-dimensional orbit near the L1 , L2 or L3 Lagrange points in the three-body problem of orbital mechanics .. orbit. orbit. three-body problem. three-body problem. orbital mechanics. orbital mechanics. Although the Lagrange point is just a point in empty space , its peculiar characteristic is that it can be orbited .. Halo orbits are the result of a complicated interaction between the gravitational pull of the two planetary bodies and the Coriolis and centrifugal accelerations on a spacecraft .. Coriolis. Coriolis effect. centrifugal accelerations. Centrifugal force. Halo orbits exist in any three-body system , e.g. the Sun -- Earth system and the Earth -- Moon system .. Sun. Sun. Earth. Earth. Moon. Moon. Continuous `` families '' of both Northern and Southern halo orbits exist at each Lagrange point .. Because halo orbits tend to be unstable , stationkeeping is required to keep a satellite on the orbit .. orbit. orbit. stationkeeping. Orbital station-keeping