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The Origin of Jupiter’s Obliquity

Presentation #203.03 in the session Planets and Satellites Dynamics (Oral Presentation)

Published onOct 23, 2023
The Origin of Jupiter’s Obliquity

The origin of the 3.12 degree obliquity of Jupiter’s spin axis to its orbit normal is unknown. Newly determined estimates of Jupiter’s moment of inertia rule out a previously proposed explanation involving a resonance with the precession of the inclined orbit of Uranus. We find that a non-adiabatic crossing of the resonance between Jupiter’s spin precession and the -f5+f6+g6 mode could have tilted Jupiter to its present day obliquity starting from a 0 degree primordial obliquity. This places constraints on the migration rates of the satellites Ganymede and Callisto.

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