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Loading contentA small camera that identifies star patterns to determine which way a spacecraft is pointed, to a fraction of an arcsecond. Star trackers give the precise attitude a spacecraft needs to aim its high-gain antenna at Earth and its instruments at a target.
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.