Recalibration and Rectification of Additional Galileo NIMS Spectral Images of the Galilean satellites

Details Recalibration and Rectification of Additional Galileo NIMS Spectral Images of the Galilean satellites Recalibration and Rectification of Additional Galileo NIMS Spectral Images of the Galilean satellites

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.3014h&link_type=abstract

American Astronomical Society, DPS meeting #38, #30.14; Bulletin of the American Astronomical Society, Vol. 38, p.540

Astronomy and Astrophysics

Astronomy

Scientific paper

We are currently recalibrating and rectifying the Galileo Near Infrared Mapping Spectrometer (NIMS) dataset. About half of the NIMS observations of Ganymede had previously been completed, and we will show results from several of the remaining Ganymede observations. The recalibration involves starting with the raw instrument data records, removing dark levels and patterns, and applying a new radiometric calibration that principally improves the results at wavelengths below 1 µm. The additional Ganymede observations will be analyzed for ice crystallinity, as we have done previously, and will use an new analysis which estimates water ice grain size and abundance for each NIMS pixel. At high phase angles, the instrument viewed through parts of a rotating section of the spacecraft, generically called "booms", which cause the periodic obscuration of the target with added reflected and thermal energy. The effects of the booms were originally poorly compensated for, and we will present a procedure that properly identifies the affected data, and that also recovers data that has been only partially obscured. This boom correction is initially necessary for several high-phase Ganymede observations. We are seeking an accurate radiometric calibration for the highest gain state (used primarily for Callisto observations), and have already verified the calibration for observations after the sixth orbit. We also hope to present the initial studies of improved radiation spike removal in observations where the spike density is more than about 50% (used primarily
for Europa observations). This work is supported by the NASA Outer Planets Research Program.

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