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Publication . Article . 2016

Seasonal and static gravity field of Mars from MGS, Mars Odyssey and MRO radio science

Antonio Genova; Sander Goossens; Frank G. Lemoine; Erwan Mazarico; Gregory A. Neumann; David E. Smith; Maria T. Zuber;
Open Access
Published: 01 Jul 2016 Journal: Icarus, volume 272, pages 228-245 (issn: 0019-1035, Copyright policy )
Publisher: Elsevier BV
Abstract We present a spherical harmonic solution of the static gravity field of Mars to degree and order 120, GMM-3, that has been calculated using the Deep Space Network tracking data of the NASA Mars missions, Mars Global Surveyor (MGS), Mars Odyssey (ODY), and the Mars Reconnaissance Orbiter (MRO). We have also jointly determined spherical harmonic solutions for the static and time-variable gravity field of Mars, and the Mars k 2 Love numbers, exclusive of the gravity contribution of the atmosphere. Consequently, the retrieved time-varying gravity coefficients and the Love number k 2 solely yield seasonal variations in the mass of the polar caps and the solid tides of Mars, respectively. We obtain a Mars Love number k 2 of 0.1697 ± 0.0027 (3- σ ). The inclusion of MRO tracking data results in improved seasonal gravity field coefficients C 30 and, for the first time, C 50 . Refinements of the atmospheric model in our orbit determination program have allowed us to monitor the odd zonal harmonic C 30 for ∼1.5 solar cycles (16 years). This gravity model shows improved correlations with MOLA topography up to 15% larger at higher harmonics ( l = 60–80) than previous solutions.
Subjects by Vocabulary

Microsoft Academic Graph classification: Martian polar ice caps Exploration of Mars Astrobiology Geology Geodesy Gravity anomaly Mars Exploration Program Gravitational field Love number Atmosphere Gravity (chemistry)


Space and Planetary Science, Astronomy and Astrophysics

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