Mars Exploration Rover Pancam Observations of Spectral Diversity in Fine-Grained Materials at the Gusev and Meridiani Landing Sites

Details Mars Exploration Rover Pancam Observations of Spectral Diversity in Fine-Grained Materials at the Gusev and Meridiani Landing Sites Mars Exploration Rover Pancam Observations of Spectral Diversity in Fine-Grained Materials at the Gusev and Meridiani Landing Sites

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.7002b&link_type=abstract

American Astronomical Society, DPS meeting #38, #70.02; Bulletin of the American Astronomical Society, Vol. 38, p.623

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During 900 sols on Mars, the Mars Exploration Rover Spirit and Opportunity Pancam instruments have acquired more than 1500 "13 filter" single-pointing multispectral image cubes of targets of interest along each rover's traverse. These image cubes sample 11 distinct narrowband wavelengths between 432 nm and 1009 nm, and have been calibrated to absolute radiance and I/F using pre-flight calibration data and in-flight observations of the Pancam calibration target. The data were acquired in order to help constrain the iron-bearing mineralogy of martian materials, to help choose targets for in situ chemical and mineralogic measurements, and to provide context and visible to near-IR color data to augment chemical, Microscopic Imager, and Mini-TES observations.
Our analysis here focuses on the Pancam spectral properties of the fine-grained components: mostly soil and dust materials but also sand, cobbles, spherules, RAT grindings, and some rock/outcrop surfaces. We analyzed about 900 and 600 Pancam image cubes acquired through Spirit sol 831 and Opportunity sol 754, respectively. Distinctive potential spectral units were identified in a subset of these cubes first through visual inspection of false-color composite images. Spectra from these units were then examined in detail and average unit spectra were extracted using manually defined regions of interest. Our final data set consisted of about 1200 spectra from Spirit and 350 spectra from Opportunity. These were then grouped into spectral classes using a combination of band parameterizations, spectral similarity algorithms, and visual inspection. Our 20 current Spirit classes include 4 bright, 3 dark, and 8 white/yellow soil classes, 4 rock/rock dust classes, and a sky class. Our 19 current Opportunity classes include 7 for soils, 3 for spherules, 3 for small rocks/cobbles, 3 for rocks/rock dust, and 3 sky/other classes. Here we show examples of these spectral classes and discuss their distribution and mineralogic interpretations.

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