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Primordial black holes (PBHs) remain a viable dark matter candidate in theasteroid-mass range. We point out that in this scenario, the PBH abundancewould be large enough for at least one object to cross through the inner SolarSystem per decade. Since Solar System ephemerides are modeled and measured toextremely high precision, such close encounters could produce detectableperturbations to orbital trajectories with characteristic features. We evaluatethis possibility with a suite of simple Solar System simulations, and we arguethat the abundance of asteroid-mass PBHs can plausibly be probed by existingand near-future data.

Close encounters of the primordial kind: a new observable for primordial black holes as dark matter