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Loading contentGyroscopes and accelerometers in an inertial measurement unit that sense a spacecraft's rotation and acceleration, propagating its orientation between star-tracker updates and through manoeuvres when other references are unavailable.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.