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Encyclopedia > Lissajous orbit

In orbital mechanics, a Lissajous orbit is a quasi-periodic orbital trajectory an object can follow around a colinear libration point of a two-body system without requiring any propulsion. Unlike halo orbits around a libration point, Lissajous orbits are not coplanar with the two-body system. Instead, they include both planar and vertical components. Image File history File links Wiki_letter_w. ... This article or section should be merged with Celestial Mechanics Astrodynamics is the study and creation of orbits, especially those of artificial satellites. ... In celestial mechanics, the Lagrangian points, (also Lagrange point, L-point, or libration point) are the five stationary solutions of the circular restricted three-body problem. ...

In practice, any orbit around a colinear libration point is dynamically unstable, meaning small departures from equilibrium grow exponentially over time. As a result, spacecraft in libration point orbits must use their propulsion systems to perform orbital stationkeeping. Stationkeeping in a Lissajous orbit requires less momentum change than station keeping in a halo orbit, where the object follows an elliptical path about the libration point. In astrodynamics orbital stationkeeping is a term used to describe a particular set of orbital maneuvers used to keep a spacecraft in assigned orbit, either low earth orbit (LEO), or geostationary orbit (GEO). ...

• http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=34699
• http://www.daviddarling.info/encyclopedia/L/Lissajous_orbit.html

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