Behavior of nearby synchronous rotations of a Poincaré-Hough satellite at low eccentricity

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a study of the Poincaré-Hough model of rotation of the synchronous natural satellites, in which these bodies are assumed to be composed of a rigid mantle and a triaxial cavity filled with inviscid fluid of constant uniform density and vorticity. In considering an Io-like body on a low eccentricity orbit, we describe the different possible behaviors of the system, depending on the size, polar flattening and shape of the core. We use for that the numerical tool. We propagate numerically the Hamilton equations of the system, before expressing the resulting variables under a quasi-periodic representation. This expression is obtained numerically by frequency analysis. This allows us to characterise the equilibria of the system, and to distinguish the causes of their time variations. We show that, even without orbital eccentricity, the system can have complex behaviors, in particular when the core is highly flattened. In such a case, the polar motion is forced by several degrees and longitudinal librations appear. This is due to splitting of the equilibrium position of the polar motion. We also get a shift of the obliquity when the polar flattening of the core is small.
Original languageEnglish
Pages (from-to)353-383
Number of pages31
JournalCelestial Mechanics & Dynamical Astronomy
Volume112
Issue number4
DOIs
Publication statusPublished - 1 Apr 2012

Fingerprint

Dive into the research topics of 'Behavior of nearby synchronous rotations of a Poincaré-Hough satellite at low eccentricity'. Together they form a unique fingerprint.

Cite this