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Compositional diversity of the lunar North Pole: Preliminary analyses of Galileo SSI dataIn 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.
Document ID
Document Type
Conference Paper
Pieters, C. M. (Brown Univ. Providence, RI, United States)
Belton, M. (Kitt Peak National Observatory Tucson, AZ., United States)
Head, James W. (Brown Univ. Providence, RI, United States)
Greeley, R. (Arizona State Univ. Tempe., United States)
Mcewen, A. (Geological Survey Flagstaff, AZ., United States)
Fischer, E. M. (Brown Univ. Providence, RI, United States)
Sunshine, J. M. (Brown Univ. Providence, RI, United States)
Klaasen, K. (Jet Propulsion Lab. California Inst. of Tech., Pasadena., United States)
Plutchak, J. (Brown Univ. Providence, RI, United States)
Neukum, G. (Deutsche Forschungsanstalt fuer Luft- und Raumfahrt Oberpfaffenhofen, Germany)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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