Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1263w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, April 1988, p. 1263-1268.
Astronomy and Astrophysics
Astronomy
17
Ceres Asteroid, Microwave Spectra, Remote Sensing, Very Large Array (Vla), Astronomical Maps, Regolith, Asteroids, Microwave Methods, Spectra, Ceres, Earth-Based Observations, Wavelengths, Flux, Density, Statistical Analysis, Comparisons, Surface, Structure, Composition, Astronomy, Brightness Temperature, Techniques, Thermal Properties, Electrical Properties
Scientific paper
This paper presents new measurements of the microwave flux of Ceres obtained at wavelengths between 3.3 mm and 20 cm using the 12 m Kitt Peak antenna and the Very Large Array. These new measurements are combined with previous measurements to confirm a substantial decrease in flux density at centimeter wavelengths compared to millimeter wavelength. Using a statistical technique adapted from terrestrial microwave remote sensing, this spectrum has been compared with that of various candidate materials and models for the subsurface structure of Ceres. It is concluded that Ceres is largely covered with a 3-cm-thick layer whose dielectric properties resemble dry terrestrial clay. This layer may have formed by micrometeorite impact on hydrothermally altered basic or ultrabasic rock or on carbonaceous chondrite material.
Hobbs Richard W.
Johnston Ken J.
Kaplan George H.
Lamphear E. S.
Lowman Paul D.
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