Determination of rock type on Mercury and the moon through remote sensing in the thermal infrared

Details Determination of rock type on Mercury and the moon through remote sensing in the thermal infrared Determination of rock type on Mercury and the moon through remote sensing in the thermal infrared

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..808t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 808-811.

Astronomy and Astrophysics

Astronomy

39

Infrared Astronomy, Lunar Rocks, Mercury Surface, Petrology, Planetary Composition, Emission Spectra, Emissivity, Plains, Thermal Emission

Scientific paper

Thermal infrared emission spectra of the moon and Mercury have been obtained using the Si:As photoconductor and circular variable filter at the NASA Infrared Telescope Facility on Mauna Kea, Hawaii. Lunar spectra from 7.2 to 12.2 microns for two different locations in the south polar highlands have Christiansen frequency peaks at 8.1 microns and 7.9 microns, respectively. This indicates different compositions at the two locations; mafic in the first case, more felsic in the second. Emission spectra from Mercury are not as spatially localized,; however, the longitude of maximum contribution to the spectrum can be calculated from thermal models of the earth-facing disk. Results for areas centered at two longitudes have been obtained. Two locations in the intercrater plains were observed. At 40-deg longitude (very near the crater Homer), a peak at 7.9 microns indicates mafic igneous rock type. Spectra emanating from 46-deg longitude have peaks at 7.8 microns, indicating a region borderline between mafic and intermediate composition.

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