8172 20260914101432.0 CTALK-2026-0140 Rivoldini, Attilio Constraining Mercury’s Interior Structure From Geodesy Data And Thermal State 2026 2026-08-04 Interior structure inferences of Mercury based on geodesy data can be strongly affected by prior assumptions about the detailed thermal structure of the core. In particular, the presence of a conductive, upper core thermally stratified layer (CTSL) is often neglected, although it directly affects the temperature profile of the core and, as a result, core composition and inner core radius inferences. The upper CTSL is a key ingredient in numerical dynamo simulations that are able to explain important features of Mercury’s magnetic field. Additional support for a CTSL layer also follows from thermal evolution studies using constraints on dynamo action in the core. In this study, we assess how core composition assumptions, the present-day thermal state, and theCTSLaffectMercury’sannuallibrationamplitude,long-periodlibration,obliquity,andtidal Love numbers. To determine the present-day thermal state, we use results from whole-planet thermal evolution simulations that are consistent with assumptions on core composition and are constrained by crustal thickness and past and present dynamo activity. We also investigate the effects of internal couplings and dynamical shape of the libration and obliquity. 3PRODPLANINT/ 3PRODPLANINT/ 3PRODPLANINT NO Tosi, Nicola Lécaille, Manon Van Hoolst, Tim Trinh, Anthony Baland, Rose-Marie Yseboodt, Marie Xiao, Haifeng 46th COSPAR Scientific Assembly 2026, Florence, Italy attilio.rivoldini@ksb-orb.be 5930568 http://publi2-as.oma.be/record/8172/files/Cospar 2026 Florence.pdf 10386 http://publi2-as.oma.be/record/8172/files/Cospar 2026 Florence.gif?subformat=icon icon 8452 http://publi2-as.oma.be/record/8172/files/Cospar 2026 Florence.jpg?subformat=icon-180 icon-180 Contributed CTALKCONT