Where NASA and ESA disagree

The agencies use different software (JPL's Sentry-II vs ESA's Aegis), different observation weighting, and different cut-offs for which objects to list. For most shared objects they agree within a factor of three; the rest are below.

Points on the diagonal agree. Each step of 1 on either axis is a factor of ten.

Largest disagreements

Large factors usually mean the agencies' orbit solutions use different observation sets or weighting; a different number of virtual impactors (VIs) shows they found different possible impact trajectories.

Listed by only one agency

Objects listed by only one agency are almost always at the very bottom of the risk range, near each agency's listing threshold.