Infrared observations of PHOBOS and Deimos from Viking

Details Infrared observations of PHOBOS and Deimos from Viking Infrared observations of PHOBOS and Deimos from Viking

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....8710297l&link_type=abstract

(International Colloquium on Mars, 3rd: Dedicated to Thomas A. Mutch /1931-1980/, Pasadena, CA, Aug. 30-Sept. 2, 1982.) Journal

Astronomy and Astrophysics

Astronomy

23

Deimos, Infrared Imagery, Phobos, Satellite Surfaces, Surface Temperature, Thermal Conductivity, Thermal Mapping, Astronomical Photometry, Brightness Temperature, Eclipses, High Resolution, Infrared Photometry, Viking Orbiter Spacecraft, Wavelengths

Scientific paper

The surface thermal properties of Phobos and Deimos are evaluated by utilizing observations made with the Viking Orbiter Infrared Thermal Mapper at wavelengths ranging from 6 to 20 microns. The results, based on both global and high-resolution infrared photometry of the satellite surfaces as well as eclipse observations, indicate the presence of surface material of low thermal conductivity comparable to that of the earth's moon. Values for the thermal inertia (I) of Phobos are I = approximately 0.0009-0.0016 cal/(sq cm)(s exp 1/2)(K), and for Deimos I = approximately 0.0006-0.0020 cal/(sq cm)(s exp 1/2)(K). It is concluded that both satellites are covered with a vertically uniform layer of finely divided material at least several centimeters thick. It is determined that the observed differences between the brightness temperatures at different wavelengths on Phobos are mainly due to topographic slopes and to the presence of approximately 5% by area high inertia or blocky material.

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