Spin-Orbit Secondary Resonance Dynamics of Enceladus | Zendy

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Spin-Orbit Secondary Resonance Dynamics of Enceladus

Author(s) -

Jack Wisdom

Publication year - 2004

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/421360

Subject(s) - enceladus , physics , commensurability (mathematics) , libration (molecule) , tidal locking , astronomy , resonance (particle physics) , amplitude , rotation period , astrophysics , stars , spin (aerodynamics) , optics , atomic physics , geometry , mathematics , point (geometry) , thermodynamics

For Enceladus the frequency of small-amplitude oscillations about the synchronous rotation state is approx- imately one-third the orbital frequency. Near this commensurability a period-three bifurcation occurs; on a surface of section a period-three chain of secondary islands appears near the synchronous island center. Forced libration in this resonance may be large and would imply large tidal heating. This paper explores the possibility that Enceladus is or once was locked in this period-three librational resonance, and that the observed resurfacing of Enceladus is a consequence.

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