HR: 1340h
AN: G43A-0791    [Abstracts]
TI: Libration dynamics of a three-layer Mercury
AU: * Dehant, V M
EM: v.dehant@oma.be
AF: Royal Observatory of Belgium, 3 avenue Circulaire, Brussels, B1180 Belgium
AU: de Viron, O
EM: o.deviron@oma.be
AF: Royal Observatory of Belgium, 3 avenue Circulaire, Brussels, B1180 Belgium
AB: We studied the rotation dynamics of Mercury, assuming a three layer planet, with a solid inner core, a fluid core and an elastic mantle. In particular, we analyzed the resonance associated with the liquid core and solid inner-core, and their impact on the libration of the planet. Due to those resonances, some libration frequencies will be strongly amplified; as the resonance periods and amplifications are function of the core and inner core size and rheologic properties, this would be a way to get more information about Mercury's interior. The paper assesses the possibility to determine interior properties of Mercury from libration observations.
DE: 5430 Interiors (8147)
DE: 5450 Orbital and rotational dynamics
DE: 1239 Rotational variations
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting