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Loading contentMeasuring the positions and brightness of asteroids, and timing the moments they pass in front of stars. From these occultation timings, amateurs reconstruct asteroid shapes and sizes to a precision that rivals spacecraft flybys.
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.