Other
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...53...90c&link_type=abstract
Icarus, vol. 53, Jan. 1983, p. 90-104.
Other
74
Iapetus, Reflected Waves, Satellite Surfaces, Spectral Reflectance, Spectrophotometry, Albedo, Data Correlation, Infrared Spectroscopy, Phoebe, Ubv Spectra, Saturn, Satellites, Observations, Photometry, Spectrophotometry, Color, Iapetus, Spectra, Comparisons, Infrared, Wavelengths, Polar Regions, Ice, Absorption, Reflectance, Hypotheses, Formation, Enrichment, Impacts, Deposition, Particles
Scientific paper
Spectrophotometry of the Saturn satellite Iapetus in the 0.3-1.0 micron wavelength range shows the dark hemisphere to be very red, similar to a few asteroids and the earth's moon, but with no spectral features implying olivine or pyroxene. Near-IR spectrophotometry in the 1.4-2.5 and 3.0-3.8 micron ranges shows water ice absorption bands that may be due to the polar caps' intrusion into the dark hemisphere. Three hypotheses for the formation of the dark hemisphere are discussed in light of the observational data, and it is found most likely that debris from Phoebe or other unknown outer satellites of Saturn impacts the dark hemisphere of Iapetus as Poynting-Robertson drag causes the debris to spiral toward Saturn. The high velocity impacts preferentially remove ice from the satellite's surface, yielding the enrichment of included carbonaceous material intrinsic to Iapetus.
Beerman C.
Bell Jon F.
Brown Harvey R.
Cruikshank Dale P.
Gaffey Michael J.
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