FIGURE 6.1 LAGRANGIAN POINTS IN THE EARTH-MOON SYSTEM and are located in the orbit of the moon, the energy required to reach these points is essentially equal to the energy required to reach the moon. In tne supra-GEO disposal option it is envisioned that the SPS satellite would be removed from geosynchronous orbit to an orbit which is somewhat higher than geosynchronous and from which decay or perturbation resulting in interference with tne geosynchronous would require a vast period of time (say greater than 10,000 years). Orbits lower than GEO were not considered as a viable disposal option because of the fact that they would result in disposed SPS satellites shadowing operational SPS satellites. Any of a variety of supra-GEO orbits, however, are open for consideration. The orbit proposed here is two times GEO. This is an orbit which is substantially removed from GEO but yet one for which the energy requirements to reach it are modest.
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