Asubsynchronous orbit is anorbit of asatellite that is nearer the planet than it would be if it were insynchronous orbit, i.e. the orbital period is less than thesidereal day of the planet.[1]
An Earth satellite that is in (aprograde) subsynchronous orbit will appear to drift eastward as seen from the Earth's surface.[1]
TheGeosynchronous-belt subsynchronous orbital regime is regularly used inspaceflight. This orbit is typically used to house workingcommunication satellites that have not yet been deactivated, and may be still be used again ingeostationary service if the need arises.[2]
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