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Estimating Jupiter's gravity field using Juno measurements, trajectory estimation analysis, and a flow model optimization

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doi: 10.3847/1538-3881/aa72db
Authors:Galanti, Eli; Durante, Daniele; Finocchiaro, Stefano; Iess, Luciano; Kaspi, Yohai
Author Affiliations:Primary:
Weizmann Institute of Science, Department of Earth and Planetary Sciences, Rehovot, Israel
Sapienza Universita di Roma, Dipartimento di Ingegneria Meccanica e Aerospaziale, Rome, Italy
Volume Title:Astronomical Journal (New York)
Source:The Astronomical Journal (New York), 154(1). Publisher: IOP Publishing for American Institute of Physics, Bristol, United Kingdom. ISSN: 0004-6256
Publication Date:2017
Note:In English. 28 refs.; illus.
Summary:The upcoming Juno spacecraft measurements have the potential of improving our knowledge of Jupiter's gravity field. The analysis of the Juno Doppler data will provide a very accurate reconstruction of spatial gravity variations, but these measurements will be very accurate only over a limited latitudinal range. In order to deduce the full gravity field of Jupiter, additional information needs to be incorporated into the analysis, especially regarding the Jovian flow structure and its depth, which can influence the measured gravity field. In this study we propose a new iterative method for the estimation of the Jupiter gravity field, using a simulated Juno trajectory, a trajectory estimation model, and an adjoint-based inverse model for the flow dynamics. We test this method both for zonal harmonics only and with a full gravity field including tesseral harmonics. The results show that this method can fit some of the gravitational harmonics better to the "measured" harmonics, mainly because of the added information from the dynamical model, which includes the flow structure. Thus, it is suggested that the method presented here has the potential of improving the accuracy of the expected gravity harmonics estimated from the Juno and Cassini radio science experiments. Copyright (Copyright) 2017. The American Astronomical Society. All rights reserved.
Subjects:Doppler effect; Geophysical methods; Geophysical surveys; Giant planets; Gravity field; Hydrodynamics; Jupiter; Mathematical models; Outer planets; Planets; Satellites; Saturn; Spacecraft; Surveys; Trajectories; Winds; Juno
Record ID:809762-2
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom
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