Pluto's perihelion libration is enabled by the orbit-averaged secular perturbations of Jupiter, Saturn, and Uranus, which raise the critical k² from about 0.30 to above Pluto's 0.87.
The Astronomical Journal 70:10--13
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Libration of Pluto's argument of perihelion and the role of the major planets
Pluto's perihelion libration is enabled by the orbit-averaged secular perturbations of Jupiter, Saturn, and Uranus, which raise the critical k² from about 0.30 to above Pluto's 0.87.