Other
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...25..416d&link_type=abstract
(International Astronomical Union and COSPAR, Colloquium on Planetary Satellites, 28th, Cornell University, Ithaca, N.Y., Aug. 1
Other
11
Albedo, Jupiter (Planet), Natural Satellites, Optical Polarization, Planetary Surfaces, Polarimetry, Astronomical Photometry, Astronomical Spectroscopy, Europa, Ice Formation, Imaging Techniques, Io, Meteorite Collisions, Surface Properties, Tables (Data)
Scientific paper
New measurements of the amount of polarization of the Galilean satellites are given and, within the context of other data, are interpreted as follows. The polarization of Europa is consistent with a water-frost surface. Io has a surface of partly absorbing crystals thought to result from evaporates released from the mantle and damaged by radiation. Ganymede has alternating water-frost areas and darker terrain, possibly of a silicaceous nature. Callisto is explained as having a mantle of ice containing embedded blocks of rocks, which occurred when recent evaporation left the blocks piled at the surface in a chaotic manner. This event occurred after the vicinity of Jupiter had been cleared of small orbiting objects able to impact Callisto. Meteorites which continue to enter within the sphere of influence of Jupiter can collide with Callisto only on its leading hemisphere, which is thereby comminuted by impacts. The surface of the trailing hemisphere is not regolithic.
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