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. Although a spacecraft in a halo orbit moves in a circular path around the Lagrange point, it does not technically orbit the actual Lagrange point, because the Lagrange point is just an equilibrium point with no g...
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http://en.wikipedia.org/wiki/Halo_orbit
A halo orbit around the first Lagrangian point of the Earth-Sun system An orbit in which a spacecraft will remain in the vicinity of a Lagrangian point, following a circular or elliptical loop around that point. The first mission to take advantage of such an orbit was ISEE-3, launched in 1978....
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http://www.daviddarling.info/encyclopedia/H/haloorbit.html
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