Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1275s&link_type=abstract
Lunar and Planetary Science, volume 27, page 1275
Computer Science
Iapetus, Reflectance Spectra
Scientific paper
The composition and origin of the dark material on the leading hemisphere of Iapetus remains a mystery. Evidence for phyllosilicates exists in the form of a 3.0-m water of hydration absorption also found in the photometry of many C- class asteroids. The steep spectral slope, however, suggests that organics are present in the dark Iapetus material. Reflectance spectra covering the wavelength interval of 0.38 to 0.88 m were obtained of the trailing (bright) hemisphere of Iapetus on 9/22/93 (~3.9 days from W elongation) and of the leading (dark) hemisphere on 10/25/93 (~1.6 days from E elongation) using the University of Arizona 1.54-m telescope with a narrowband CCD spectrograph having a dispersion of 11 Angstroms/pixel. The checkerboard linear mixing model defined and used by Bell et al (1985) was applied to these spectra to remove the spectral effects of the bright polar caps on Iapetus from the spectrum of the dark material. A steeply-sloped spectrum consistent with the photometry previously derived with an absorption feature centered at 0.67 micrometers was produced.
Gaffey Michael J.
Larson Stefan M.
Stockstill Karen R.
Vilas Faith
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