Abstract
The Visual and Infrared Mapping Spectrometer (VIMS) observed the Galilean
satellites during the Cassim spacecraft's 2000/2001 flyby of Jupiter,
providing compositional and thermal information about their surfaces.
The Cassini spacecraft approached the jovian system no closer than
about 126 Jupiter radii, about 9 million kilometers, at a phase angle
of < 90degrees, resulting in only sub-pixel observations by VIMS
of the Galilean satellites. Nevertheless, most of the spectral features
discovered by the Near Infrared Mapping Spectrometer (NIMS) aboard
the Galileo spacecraft during more than four years of observations
have been identified in the VIMS data analyzed so far, including
a possible C-13 absorption. In addition, VIMS made observations in
the visible part of the spectrum and at several new phase angles
for all the Galilean satellites and the calculated phase functions
are presented. In the process of analyzing these data, the VIMS radiometric
and spectral calibrations were better determined in preparation for
entry into the Saturn system. Treatment of these data is presented
as an example of the VIMS data reduction, calibration and analysis
process and a detailed explanation is given of the calibration process
applied to the Jupiter data. (C) 2004 Elsevier Inc. All rights reserved.
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