The spin-axis precession period of Jupiter is near that of a fundamental Laplace-Lagrange solar system mode describing the precession of Uranus's orbit plane (~4.3 × 10 5 yr). As a result, a portion of the 3 1 obliquity of Jupiter may actually be forced by a spin-orbit secular resonance with Uranus. If this portion predominates, it allows for a constraint on Jupiter's moment of inertia that is independent of interior models.
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Ward et al. (2006) studied this question.
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