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About: Critical-list minor planet     Goto   Sponge   NotDistinct   Permalink

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A critical-list minor planet (critical list numbered object or critical object) is a numbered minor planet whose orbit and position is especially in need of improvement. The IAU's Minor Planet Center (MPC) regularly publishes a list of these critical objects in their Minor Planet Electronic Circular. The list typically contains asteroids that have been observed at a small number of apparitions, especially on opposition, or that have not been adequately observed for more than 10 years, while other observatories create their own, customized lists. The MPC also lists currently observable critical objects on their website, providing differently formatted lists of orbital elements to the worldwide astrometric community.