Analysis has shown that it is possible to choose a main spacecraft orbit (similar to 0.5 km radius) and a minisatellite orbit (similar to 1.5 km radius), so that passive motion of the spacecraft around the asteroid remains stable within the context of a given model for a sufficiently long duration of time, i.e., approximately a month for the main spacecraft and several years for the minisatellite, until Apophis approaches the Earth in 2029.
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