The effect of tides on the longitudinal libration of Ganymede
(2013) European Planetary Science Congress — Location: London, United Kingdom (8.September.2013)
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- Authors
- Abstract
- The gravitational force exerted by Jupiter deforms Ganymede (tides) and periodically changes its rota- tion (librations). Tides and librations are usually stud- ied separately but we here show that tides can sub- stantially reduce the libration amplitude of Ganymede. Periodic tides affect libration in three ways: first the periodic tidal bulges modify the gravitational torque exerted by Jupiter, second the gravitational and pres- sure torques between the different internal layers of Ganymede are both quantitatively and qualitatively al- tered, and third the zonal tides periodically change the polar moment of the satellite, which acts as the inertia for rotational motion. Here we report on a new analyt- ical method developed to study these elastic effects on the longitudinal librations of icy satellites and present numerical results for Ganymede.
- Affiliations
Royal Observatory of Belgium Reference Systems and Planetology
Citations
Van Hoolst, T., Baland, R.-M., & Trinh, A. (2013). The effect of tides on the longitudinal libration of Ganymede. European Planetary Science Congress, London, United Kingdom. https://hdl.handle.net/2078.5/46928