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The PFS- satellites were inserted into a lunar orbit in order to map, amongst other things, its gravitational field. So you would expect their orbit to be accurately known and monitored. The Apollo 16 mission report gives the following orbital parameters in Sect. 5-5 PFS-1 : Perilune 105 km, Apolune 144 km, Inclination -28 deg PFS-2: Perilune 97 km, Apolune ...


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For quick and easy experimenting with NASA Horizons, I set up a page: http://win98.altervista.org/space/exploration/NHUGUI.html I also tried explaining the possible "quantities" (for "OBSERVER" table) visually rather than by text like in original documentation, as it is very hard to describe by text a graphical concept (it looks like ...


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