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Published January 1991 | public
Journal Article

Phobos: Spectrophotometry between 0.3 and 0.6 μm and IR-radiometry

Abstract

A 0.3–0.6 (μm UV-visible spectrophotometer and a 5–50 μm 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 typlcal surface thermal inertia of 1-3 x 10^(-3) cal/(cm^2) deg S^(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's surface.

Additional Information

© 1991 Pergamon Press. Camera-ready copy received 15 May 1990. Thanks to John Mustard and Paul Helfenstein for helpful comments, and to Peter Neivert for his photographic work.

Additional details

Created:
August 19, 2023
Modified:
October 26, 2023