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which have not been observed for many years, or even decades. as of 5 2026, the Minor Planet Center (MPC) accounts for 648,413 unnumbered minor planets which represent of the overall minor planet population. Unnumbered minor planets can be further divided into 129,103 single-opposition objects with short observation arcs, prone to mismatch and loss, and 547,652 objects that have been observed multiple times

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