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  • Presentation | P41F: The Gas Giants: Atmosphere, Interior, and Evolution of Jupiter and Saturn I Poster
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  • P41F-2674: Constraining Saturn's Tidal Dissipation and Titan's Migration Rate Combining Radio Science Normal Points and Astrometry
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Author(s):
Andrea Magnanini, University of Bologna (First Author, Presenting Author)
Valery Lainey, LTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Université, Université de Lille 1, Paris, France
Luis Gomez Casajus, University of Bologna
Marco Zannoni, University of Bologna
Paolo Tortora, University of Bologna


Recent investigations into Titan's orbital migration have produced divergent findings for Saturn's tidal dissipation, as characterized by its quality factor (Q). Lainey et al. (2020) presented evidence for a low Q value consistent with resonance locking, based on separate analyses of radio science and astrometric data. However, a subsequent study integrating data from multiple missions derived a substantially higher Q, in direct conflict with the radio science results of Lainey et al. (2020). To address this discrepancy, our study re-evaluates Titan's migration by combining Cassini radio science data, reduced to normal points, with more than a century of astrometric observations. This combined dataset was processed within a unified dynamical framework using the NOE software. Our joint analysis confirms the rapid migration rate and low Q reported by Lainey et al. (2020), thereby supporting the hypothesis of non-classical dissipation mechanisms.



Scientific Discipline
Neighborhood
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Main Session
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