Gravity Field and Internal Structure of Mercury from MESSENGER
作者： D. E. Smith , M. T. Zuber , R. J. Phillips , S. C. Solomon , S. A. Hauck
关键词: Gravitational field 、 Gravity anomaly 、 Crust 、 Outer core 、 Geology 、 Mantle (geology) 、 Mineralogy 、 Moment of inertia 、 Mercury (element) 、 Inner core
摘要: Radio tracking of the MESSENGER spacecraft has provided a model Mercury’s gravity field. In northern hemisphere, several large anomalies, including candidate mass concentrations (mascons), exceed 100 milli-Galileos (mgal). hemisphere crust is thicker at low latitudes and thinner in polar region shows evidence for thinning beneath some impact basins. The low-degree field, combined with planetary spin parameters, yields moment inertia C/MR2 = 0.353 ± 0.017, where M R are radius, ratio solid outer shell to that planet Cm/C 0.452 0.035. A radial density distribution consistent these results includes silicate mantle overlying iron-sulfide layer an iron-rich liquid core perhaps inner core.
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