Affiliation:
1. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
2. Seismological Laboratory Division of Geological and Planetary Sciences California Institute of Technology Pasadena CA USA
3. Institute for Geophysics University of Texas at Austin Austin TX USA
4. UK Centre for Astrobiology School of Physics and Astronomy University of Edinburgh Edinburgh UK
5. Department of Earth and Planetary Sciences University of California Santa Cruz Santa Cruz CA USA
Abstract
AbstractIn order to improve our understanding of the interior structure of Saturn's small moon Enceladus, we reanalyze radiometric tracking and onboard imaging data acquired by the Cassini spacecraft during close encounters with the moon. We compute the global shape, gravity field, and rotational parameters of Enceladus in a reference frame consistent with the International Astronomical Union's definition, where the center of the Salih crater is located at −5° East longitude. We recover a quadrupole gravity field with J3 and a forced libration amplitude of 0.091° ± 0.009° (3‐σ). We also compute a global shape model using a stereo‐photoclinometry technique with a global resolution of 500 m, although some local maps have higher resolutions ranging from 25 to 100 m. While our overall results are generally consistent with previous studies, we infer a thicker 27–33 km mean ice shell, a thinner 21–26 km mean ocean thickness, and a mean core density range of 2,270–2,330 kg/m3.
Publisher
American Geophysical Union (AGU)
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Geochemistry and Petrology,Geophysics
Cited by
1 articles.
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