A halo orbit is an orbit around a Lagrange point between two larger bodies. Because the orbit tends to be unstable stationkeeping is required to keep an object such as a satellite in this orbit, however many spacecraft have made use of halo orbits; one of which was the SOHO mission, a joint ESA and NASA mission to study the sun. m. ... 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 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). ... An Earth observation satellite, ERS 2 For other uses, see Satellite (disambiguation). ... The Solar and Heliospheric Observatory (SOHO) is a spacecraft that was launched on 2 December 1995 to study the Sun, and began normal operations in May 1996. ... This article is about the European Space Agency. ... This article is about the American space agency. ... The Sun is the star at the center of the Solar System. ...
^ A Search for Natural or Artificial Objects Located at the Earth-Moon Libration Points. Icarus.
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