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Loading contentA large near-Earth object on a comet-like orbit long suspected to be a dormant comet; faint carbon-dioxide activity was detected in 2013, suggesting it is not fully extinct.
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.