Europa's differentiated internal structure: inferences from four Galileo encounters

Anderson, J. D.; Schubert, G.; Jacobson, R. A.; Lau, E. L.; Moore, W. B.; Sjogren, W. L.

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NASA NTRS · 20040172554

Europa's differentiated internal structure: inferences from four Galileo encounters

Anderson, J. D.·Schubert, G.·Jacobson, R. A.·Lau, E. L.·Moore, W. B.·Sjogren, W. L.

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Abstract

Radio Doppler data from four encounters of the Galileo spacecraft with the jovian moon Europa have been used to refine models of Europa's interior. Europa is most likely differentiated into a metallic core surrounded by a rock mantle and a water ice-liquid outer shell, but the data cannot eliminate the possibility of a uniform mixture of dense silicate and metal beneath the water ice-liquid shell. The size of a metallic core is uncertain because of its unknown composition, but it could be as large as about 50 percent of Europa's radius. The thickness of Europa's outer shell of water ice-liquid must lie in the range of about 80 to 170 kilometers.

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unmanned Flight Experiment Galileo Project long duration Ice Jupiter Water Support, U.S. Gov't, Non-P.H.S Iron Extraterrestrial Environment Silicates Ferrous Compounds

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Anderson, J. D., Schubert, G., Jacobson, R. A., Lau, E. L., Moore, W. B., Sjogren, W. L.. 1998-09-25. Europa's differentiated internal structure: inferences from four Galileo encounters. https://ntrs.nasa.gov/citations/20040172554

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