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We have conducted an extensive investigation of orbit determination strategies for the Geosat Exact Repeat Mission (ERM). The goal of our studies is to establish optimum geodetic parameters and… (More)
Gamma rays in the band from 20 MeV to 300 GeV, used in combination with data from radio and X-ray bands, provide a powerful tool for studying the origin of cosmic rays in our sister galaxies… (More)
We report on rst results from an ongoing pro- gram to measure and analyze proper motions for hot subdwarf and white dwarf stars, with the aim of determining to which stellar population sdB stars (in… (More)