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Juno radiometer and gravity orbits Jupiter's radio dish and instruments are fixed to the body of the rotating spacecraft. All the instruments can be pointed at Jupiter at the same time, but in order to obtain gravity data, the high-gain antenna has to be pointed at Earth. The position of Earth in the sky changes with Jupiter and Earth's orbits, so Juno usually has to dedicate individual perijoves to either gravity or remote sensing, and can't do both at the same time. NASA / JPL-Caltech