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Loading contentAn elongated near-Earth asteroid in a chaotic, tumbling rotation, flown past by China's Chang'e 2 in 2012; it crosses both Earth's and Mars's orbits.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
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Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.