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Link to original content: https://pubmed.ncbi.nlm.nih.gov/22745254/
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. 2012 Jul 27;337(6093):457-9.
doi: 10.1126/science.1219631. Epub 2012 Jun 28.

The tides of Titan

Luciano Iess  1 , Robert A Jacobson, Marco Ducci, David J Stevenson, Jonathan I Lunine, John W Armstrong, Sami W Asmar, Paolo Racioppa, Nicole J Rappaport, Paolo Tortora
Affiliations

The tides of Titan

Luciano Iess et al. Science. .

Abstract

We have detected in Cassini spacecraft data the signature of the periodic tidal stresses within Titan, driven by the eccentricity (e = 0.028) of its 16-day orbit around Saturn. Precise measurements of the acceleration of Cassini during six close flybys between 2006 and 2011 have revealed that Titan responds to the variable tidal field exerted by Saturn with periodic changes of its quadrupole gravity, at about 4% of the static value. Two independent determinations of the corresponding degree-2 Love number yield k(2) = 0.589 ± 0.150 and k(2) = 0.637 ± 0.224 (2σ). Such a large response to the tidal field requires that Titan's interior be deformable over time scales of the orbital period, in a way that is consistent with a global ocean at depth.

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