Besides 'Oumuamua and a few other high-eccentricity, weird-inclination comets: nineteen "Centaur" planetoids are on the list.
Means we don't have to wait for the next incoming gate-crasher, if we're looking to send a mission to an alien world.
These nineteen are screened from basic Oort comets or Kuiper objects because their orbits started off polar, and they're at least as old as the Solar System itself. Since they are unlikely to have formed in the coalescence of the Solar System, they must derive from outside it.
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