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Thermal infrared observations of Mars (7.5-12.8 microns) during the 1990 opposition

Author
Roush, T. L.
Published
Jun 1, 1991.
Physical Description
1 electronic document
Additional Creators
Witteborn, F., Lucy, P. G., Graps, A., and Pollack, J. B.
Online Version

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Summary
Thirteen spectra of Mars, in the 7.5 to 12.8 micron wavelength were obtained on 7 Dec. 1990 from the Infrared Telescope Facility (IRTF). For these observations, a grating with an ultimate resolving power of 120 to 250 was used and wavelengths were calibrated for each grating setting by comparison with the absorption spectrum of polystyrene measured prior to each set of observations. By sampling the Nyquist limit at the shortest wavelengths, an effective resolving power of about 120 over the entire wavelength range was achieved. A total of four grating settings were required to cover the entire wavelength region. A typical observing sequence consisted of: (1) positioning the grating in one of the intervals; (2) calibrating the wavelength of positions; and (3) obtaining spectra for a number of spots on Mars. Several observations of the nearby stellar standard star, alpha Tauri, were also acquired throughout the night. Each Mars spectrum represents an average of 4 to 6 measurements of the individual Mars spots. As a result of this observing sequence, the viewing geometry for a given location or spot on Mars does not change, but the actual location of the spot on Mars's surface varies somewhat between the different grating settings. Other aspects of the study are presented.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19920001733.
Accession ID: 92N10951.
NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 565-566.
Terms of Use and Reproduction
No Copyright.
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