Compositional diversity of the lunar North Pole: Preliminary analyses of Galileo SSI data

Details Compositional diversity of the lunar North Pole: Preliminary analyses of Galileo SSI data Compositional diversity of the lunar North Pole: Preliminary analyses of Galileo SSI data

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1141p&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1141-1142 (SEE N94-20636 05-91

Mathematics

Logic

1

Astronomical Photometry, Cameras, Galileo Project, Lunar Craters, Lunar Crust, Lunar Gravitation, Lunar Maria, Lunar Photographs, Lunar Soil, Magnetic Poles, Polar Regions, Solid State Devices, Calibrating, Correction, Highlands, Mosaics, Pixels, Reflectance, Terrain

Scientific paper

In December 1992, the Galileo spacecraft passed through the Earth-Moon system for its final gravity assist to Jupiter. The SSI camera obtained several 6-color mosaics of the lunar north polar region and the sunlit nearside and eastern limb at approximately 1.3 km/pixel. Initial analyses have concentrated on the north polar areas to assess the composition of the crust in that region. Representative 6-color calibration SSI spectra (typically 5 x 5 pixels) are shown. Photometric corrections have not yet been applied, and all spectra are scaled to unity at 0.56 microns. The data were first calibrated relative to MS2, a standard are in Mare Serenitatis (18.7 deg N, 21.5 deg E), and the top four plots of highlands, highland craters, maria, and mare craters are displayed relative to MS2. SSI spectra of areas measured with telescopic data (mare MT1/MS2 and mare crater MSA/MS2) agree well with previous data, confirming that the calibration procedures and SSI data are spectrally accurate. The bottom three plots of craters/sun have been calibrated to reflectance using previously obtained telescopic spectra of Apollo 16/MS2 (shown with Highlands/MS2) and laboratory spectra of mature Apollo 16 soil (shown for reference with the Highland Craters/Sun). Although some variations in these spectra mimic previously observed spectra of lunar terrains, several characteristics are unusual. Familiar and unfamiliar properties are observed in these northern latitudes and both types merit further investigation in their geologic context.

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