Distribution of rock, metals, and ices in Callisto.
Radio Doppler data from a single encounter (C3) of the Galileo spacecraft with Callisto, the outermost Galilean moon of Jupiter, indicated that Callisto was probably undifferentiated. Now, similar data from a second encounter (C9) corroborate this conclusion, but more accurate data from a third encounter (C10) indicate that the rock and ice within Callisto have partially, but not completely, separated. Callisto may be differentiated into a rock-metal core less than 25 percent of Callisto's radius, an outer layer of clean ice less than 350 km thick, and a middle layer of mixed rock and ice. Models in which ice and rock are mixed all the way to the center of Callisto are also consistent with the data.
Anderson
J D
JD
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109-8099, USA.
Schubert
G
G
Jacobson
R A
RA
Lau
E L
EL
Moore
W B
WB
Sjogren
W L
WL
D005296:Ferrous Compounds; D019015:Geologic Sediments; D006112:Gravitation; D006358:Hot Temperature; D007053:Ice; D007501:Iron; D018538:Jupiter; D008670:Metals
D005296:Ferrous Compounds; D007053:Ice; D008670:Metals; D007501:Iron; C022597:ferrous sulfide