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[i]The US Air Force does do daily a conjunction assessment screening, but for only a limited number of objects. NASA and ESA have looked at all vs all conjunction assessment scenarios (basically screening everything in the catalog vs everything else) and estimated that there would be a few thousand close approaches each day. Sorting through all of those to find the ones that are the real risks, doing follow-up tracking and more detailed analysis to calculate hard probabilities and informing the right authorities requires an amount of resources that no one has at this point.[/i]
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