PHOBOS - Spectrophotometry between 0.3 and 0.6 micron and IR-radiometry

Details PHOBOS - Spectrophotometry between 0.3 and 0.6 micron and IR-radiometry PHOBOS - Spectrophotometry between 0.3 and 0.6 micron and IR-radiometry

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..311k&link_type=abstract

(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (

Computer Science

12

Infrared Radiometers, Phobos, Regolith, Satellite Surfaces, Spectral Reflectance, Spectrophotometry, Brightness Temperature, Spacecraft Instruments, Surface Properties, Temperature Measurement, Mars, Satellites, Phobos, Spacecraft Observations, Phobos 2 Mission, Krfm Instrument, Spectrophotometry, Radiometry, Equatorial Regions, Reflectance, Ultraviolet, Visible Wavelengths, Spectra, Comparisons, Optical Properties, Brightness, Thermal Properties, Texture, Morphology, Geology, Diagrams, Regolith, Analogs, H

Scientific paper

A 0.3 - 0.6 micron UV-visible spectrophotometer and a 5 - 50 micron radiometer in the KRFM experiment on Phobos 2 measured two groundtracks in the equatorial region of Phobos. Preliminary results indicate that three surface units can be recognized on the basis of differing UV-visible spectral reflectance properties. One of the units is most comparable spectrally to optically darkened mafic material, and a second is comparable either to anhydrous carbonaceous chondrite or to blackened mafic material. Spectral properties of the third unit do not resemble those of known meteorite types. Brightness temperatures measured by the radiometer are consistent with a typical surface thermal inertia of 1 - 3 x 10 to the -3 cal/(sq cm deg s exp 1/2), as suggested by previous investigations, implying a lunar-like regolith texture. At least one area of possibly higher thermal inertia has been tentatively identified, where a large degraded crater is crossed by several grooves. These results indicate significant lateral heterogeneity in the optical and textural properties of Phobos' surface.

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