Tidal dissipation within Io and Jupiter leads to a migration of the Galilean satellites. In fact, the resonant interaction between Io, Europa and Ganymede spreads the dissipative effects from Io to the orbits of the other moons. The amount of the loss of energy and the consequent rate of the orbital evolution was determined in (Lainey et al., 2009), along with the dissipative parameters k2/Q of Io and Jupiter. Although this could be considered the most reliable result in literature, there are other articles with different solutions of the moons migration. In this context, the future ESA space mission JUICE can play a key role: during its flybys tour of the Galilean satellites and an orbiting phase around Ganymede, it will provide new extremely accurate observations of the Jovian system, with which it will be possible to constrain moons’ physical properties and orbits. In particular, in this study we investigate the possibility of performing an independent estimation of the k2/Q parameters using JUICE data. However, the multiple flybys trajectory is well known to be chaotic, raising critical issues both in the design of the mission and in the orbit determination experiments. In this article we present the results of simulations using JUICE data from two different experiments (3GM and PRIDE). Differently from (Dirkx et al., 2017), we perform a simultaneous estimation of the spacecraft and Galilean satellites’ orbits, along with some dynamical parameters of interest. We will show that adopting the constrained multi-arc strategy during the chaotic phase, we manage to improve the determination of the dissipative parameters, as expected by (Serra et al., 2018). Although a complete estimation of all the relevant parameters will be addressed in future works, in this preliminary study we find a formal uncertainty of the two k2/Q of the same order of (Lainey et al., 2009). This implies that the content of information provided by JUICE is similar to the one hundred years astrometric observations used in the same article. Therefore, with JUICE data we will be able to check results and theories of previous studies about the dissipation in the Jovian system, and once added to the other available data sets, we could get a more accurate solution, covering a time span greater than the 4 years of the mission.

Chaotic orbit determination in the context of the JUICE mission

Lari G.
;
Milani A.
2019-01-01

Abstract

Tidal dissipation within Io and Jupiter leads to a migration of the Galilean satellites. In fact, the resonant interaction between Io, Europa and Ganymede spreads the dissipative effects from Io to the orbits of the other moons. The amount of the loss of energy and the consequent rate of the orbital evolution was determined in (Lainey et al., 2009), along with the dissipative parameters k2/Q of Io and Jupiter. Although this could be considered the most reliable result in literature, there are other articles with different solutions of the moons migration. In this context, the future ESA space mission JUICE can play a key role: during its flybys tour of the Galilean satellites and an orbiting phase around Ganymede, it will provide new extremely accurate observations of the Jovian system, with which it will be possible to constrain moons’ physical properties and orbits. In particular, in this study we investigate the possibility of performing an independent estimation of the k2/Q parameters using JUICE data. However, the multiple flybys trajectory is well known to be chaotic, raising critical issues both in the design of the mission and in the orbit determination experiments. In this article we present the results of simulations using JUICE data from two different experiments (3GM and PRIDE). Differently from (Dirkx et al., 2017), we perform a simultaneous estimation of the spacecraft and Galilean satellites’ orbits, along with some dynamical parameters of interest. We will show that adopting the constrained multi-arc strategy during the chaotic phase, we manage to improve the determination of the dissipative parameters, as expected by (Serra et al., 2018). Although a complete estimation of all the relevant parameters will be addressed in future works, in this preliminary study we find a formal uncertainty of the two k2/Q of the same order of (Lainey et al., 2009). This implies that the content of information provided by JUICE is similar to the one hundred years astrometric observations used in the same article. Therefore, with JUICE data we will be able to check results and theories of previous studies about the dissipation in the Jovian system, and once added to the other available data sets, we could get a more accurate solution, covering a time span greater than the 4 years of the mission.
2019
Lari, G.; Milani, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/993036
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