Development of methods for the global ephemerides estimation of the gas giant satellite systems

Gomez Casajus, Luis Antonio (2019) Development of methods for the global ephemerides estimation of the gas giant satellite systems, [Dissertation thesis], Alma Mater Studiorum Università di Bologna. Dottorato di ricerca in Meccanica e scienze avanzate dell'ingegneria, 31 Ciclo.
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Abstract

The satellite systems of Saturn and Jupiter are complex dynamical systems, with several interactions happening between the central body, its rings and the natural satellites. During the last two decades, unmanned probes allowed to study the gas giant satellite systems. The three most relevant spacecrafts to their study have been Galileo, Cassini and Juno. Galileo studied the Jupiter system, the primary body and the main moons during 8 years, despite the failure on the deployment of its high gain antenna that limited the science retrieval. Cassini, analogously, studied during most of the 13 years of its mission, the natural satellites, paying specific attention to Titan. Then, in 2017 both Cassini and Juno spacecrafts were used to carry out gravity measurements of Saturn and Jupiter. Both spacecraft were inserted into similar, almost polar, highly eccentric orbits with low pericenter altitudes. Tracking the motion of the probes during pericenter passes from the DSN enabled the retrieval of the gravity field of both gas giants at an unprecedented level of accuracy. These results provide constraints on the interiors of the gas giants, but also, on the satellite system ephemerides which, analogously, hold information on the properties and evolution of both the satellites themselves and the central body. The main aim of this project is to study and characterize the key dynamics that rule the gas giant satellite systems using an improved gravity field of the central body, estimated using radio tracking data of deep space probes. To accomplish our objective, we performed the data analysis of the previously mentioned deep space missions: Cassini, Juno and Galileo. Being the three probes the very first orbiters of gas giant planets, they provided, and still provide, precious information which contributes to unveil the gas giant satellite systems dynamics, their origin and evolution.

Abstract
Tipologia del documento
Tesi di dottorato
Autore
Gomez Casajus, Luis Antonio
Supervisore
Dottorato di ricerca
Ciclo
31
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
Radio science, Gravity experiments, Orbit determination, Gas giant satellite system, Satellite ephemerides, Tidal interaction, Io plasma torus, Dissipation
URN:NBN
Data di discussione
15 Marzo 2019
URI

Altri metadati

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