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Response to randome (Reply #4)

Wed Nov 7, 2012, 09:43 PM

8. Wikipedia entry on "Halo Orbit"

http://en.wikipedia.org/wiki/Halo_orbit

A spacecraft in a halo orbit does not technically orbit the Lagrange point itself (which is just an equilibrium point with no mass), but travels in a closed, repeating path near the Lagrange point.

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.



Halo orbit from above in a frame rotating with the two primary bodies. The blue sphere is the Earth, the gray sphere is the Moon, and the two red spheres are the Lagrange points L1 and L2. The spacecraft is orbiting near the L2 point.


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