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Mars high resolution gravity fields from MRO, Mars seasonal gravity, and other dynamical parameters |
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| Authors: | Alex S Konopliv Sami W Asmar Özgür Karatekin Suzanne E Smrekar Maria T Zuber |
| Institution: | a Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States b Royal Observatory of Belgium, Av. Circulaire, 3, B-1180 Brussels, Belgium c Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States |
| Abstract: | With 2 years of tracking data collection from the MRO spacecraft, there is noticeable improvement in the high frequency portion of the spherical harmonic Mars gravity field. The new JPL Mars gravity fields, MRO110B and MRO110B2, show resolution near degree 90. Additional years of MGS and Mars Odyssey tracking data result in improvement for the seasonal  gravity changes which compares well to global circulation models and Odyssey neutron data and Mars rotation and precession ( ). Once atmospheric dust is accounted for in the spacecraft solar pressure model, solutions for Mars solar tide are consistent between data sets and show slightly larger values (k2 = 0.164 ± 0.009, after correction for atmospheric tide) compared to previous results, further constraining core models. An additional 4 years of Mars range data improves the Mars ephemeris, determines 21 asteroid masses and bounds solar mass loss (dGMSun/dt < 1.6 × 10−13 GMSun year−1). |
| Keywords: | Mars Interior Geophysics Planetary dynamics Asteroids |
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