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to suggest that an undiscovered object, Planet Nine, in the outer Solar System is shepherding these distant objects into similar type orbits.

Its last perihelion was within a couple months of September 1979. The paucity of bodies with perihelia at appears not to be an observational artifact and is known as the Kuiper cliff.

is possibly a member of a hypothesized Hills cloud. It has a perihelion, argument of perihelion,

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