The Juno Extended Mission presented the first opportunity to acquire gravity measurements of Ganymede since the end of the Galileo mission. These new Juno data offered the chance to carry out a joint analysis with the Galileo data set, improving our knowledge of Ganymede's gravity field and shedding new light upon its interior structure. Through reconstruction of Juno's and Galileo's orbit during the Ganymede flybys, the gravity field of the moon was estimated. The results indicate that Ganymede's degree-2 field is compatible with a body in hydrostatic equilibrium within 1-sigma and hint at regional gravity anomalies with amplitudes exceeding those inferred by Cassini for Titan. Our explicit treatment of non-hydrostatic effects leads to wider confidence intervals for the derived moment of inertia with respect previous analyses. The higher central value of the derived moment of inertia indicates a lesser degree of Ganymede's differentiation.

Gravity field of ganymede after the Juno extended mission / Gomez Casajus, L.; Ermakov, A. I.; Zannoni, M.; Keane, J. T.; Stevenson, D.; Buccino, D. R.; Durante, D.; Parisi, M.; Park, R. S.; Tortora, P.; Bolton, S. J.. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 1944-8007. - 49:24(2022). [10.1029/2022GL099475]

Gravity field of ganymede after the Juno extended mission

Durante, D.;
2022

Abstract

The Juno Extended Mission presented the first opportunity to acquire gravity measurements of Ganymede since the end of the Galileo mission. These new Juno data offered the chance to carry out a joint analysis with the Galileo data set, improving our knowledge of Ganymede's gravity field and shedding new light upon its interior structure. Through reconstruction of Juno's and Galileo's orbit during the Ganymede flybys, the gravity field of the moon was estimated. The results indicate that Ganymede's degree-2 field is compatible with a body in hydrostatic equilibrium within 1-sigma and hint at regional gravity anomalies with amplitudes exceeding those inferred by Cassini for Titan. Our explicit treatment of non-hydrostatic effects leads to wider confidence intervals for the derived moment of inertia with respect previous analyses. The higher central value of the derived moment of inertia indicates a lesser degree of Ganymede's differentiation.
2022
radioscience; gravity field; ganymede; Juno mission; data analysis
01 Pubblicazione su rivista::01a Articolo in rivista
Gravity field of ganymede after the Juno extended mission / Gomez Casajus, L.; Ermakov, A. I.; Zannoni, M.; Keane, J. T.; Stevenson, D.; Buccino, D. R.; Durante, D.; Parisi, M.; Park, R. S.; Tortora, P.; Bolton, S. J.. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 1944-8007. - 49:24(2022). [10.1029/2022GL099475]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1662348
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