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of optical data that show a possible Earth encounter years from now. Sometimes, it cannot even be said for certain what side of the Sun such an object will be at the time of the listed virtual impactor date. For example, even though had a 1-in-500,000 chance of impacting Earth on 11 March 2023, its most likely position at that date was farther away than the Sun. Most objects in the Sentry Risk Table have an observation arc of less than 14 days, making their positions highly uncertain, and have not been

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