Callisto: a Guide to the Origin of the Jupiter System
A PAPER SUBMITTED TO THE DECADAL SURVEY ON PLANETARY SCIENCE AND ASTROBIOLOGY Callisto: A Guide to the Origin of the Jupiter System David E Smith 617-803-3377 Department of Earth, Atmospheric and PLanetary Sciences Massachusetts Institute of Technology, Cambridge MA 02139 smithde@mit.edu Co-authors: Francis Nimmo, UCSC, fnimmo@ucsc.edu Krishan Khurana, UCLA, kkhurana@igpp.ucLa.edu Catherine L. Johnson, PSI, cjohnson@psi.edu Mark Wieczorek, OCA, Fr, mark.wieczorek@oca.eu Maria T. Zuber, MIT, zuber@mit.edu Carol Paty, University of Oregon, cpaty@uoregon.edu Antonio Genova, Univ Rome, It, antonio.genova@uniroma1.it Erwan Mazarico, NASA GSFC, erwan.m.mazarico@nasa.gov Louise Prockter, LPI, prockter@Lpi.usra.edu Gregory A. Neumann, NASA GSFC Emeritus, gregory.a.neumann@nasa.gov John E. Connerney, Adnet Systems Inc., john.e.connerney@nasa.gov Edward B. Bierhaus, LMCO, edward.b.bierhaus@Lmco.com Sander J. Goossens, UMBC, sander.j.goossens@nasa.gov MichaeL K. Barker, NASA GSFC, michaeL.k.barker@nasa.gov Peter B. James, Baylor, P_James@baylor.edu James Head, Brown, James_Head@brown.edu Jason Soderblom, MIT, jms4@mit.edu July 14, 2020 Introduction Among the GaLiLean moons of Jupiter, it is outermost CaLListo that appears to most fulLy preserve the record of its ancient past. With a surface aLmost devoid of signs of internaL geologic activity, and hints from spacecraft data that its interior has an ocean whiLe being only partiaLLy differentiated, CaLListo is the most paradoxicaL of the giant rock-ice worlds. How can a body with such a primordiaL surface harbor an ocean? If the interior was warm enough to form an ocean, how could a mixed rock and ice interior remain stable? What do the striking differences between geologicaLLy unmodified CaLListo and its sibling moon Ganymede teLL us about the formation of the GaLiLean moons and the primordiaL conditions at the time of the formation of CaLListo and the accretion of giant planet systems? The answers can be provided by a CaLListo orbitaL mission.
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