Reflectance spectrophotometry extended to u.v. for terrestrial,lunar and meteoritic samples |
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| Authors: | Audouin Dollfus André Cailleux Bernard Cervelle Chon Trung Hua Jean-Claude Mandeville |
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| Institution: | 1. Observatoire de Paris, 92190 Meudon, France;2. Minéralogie, Cristallographie, Université de Paris 6, France;3. Laboratoire d''Astronomie Spatiale, 13012 Marseille, France;4. CERT/DERTS, Complexe Aerospatial, 31400 Toulouse, France |
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| Abstract: | Extension of remote sensing of planetary bodies to the ultraviolet is now feasiable up to 2000 Å from earth-orbiting telescopes and spacecraft. The benefits of this extension is analysed on the basis of laboratory spectra taken on a large variety of terrestrial, lunar and meteoritic samples. Knowledge of the albedo for two wavelengths at 2300 and 6500 Å permits classification of a surface into one of the following types: lunar, carbonaceous chondrites, ordinary chondrites, achondrites or acidic rocks, basaltic rocks, irons. For lunar-type surfaces, a simple albedo measurement at 6500 Å can be converted into quantitative abundance determinations of silicate, aluminium oxide and iron; a large amount of telescopic lunar photometry data is available for mapping these abundances. Extension of the photometry to 2300 Å permits quantitative measurement of TiO2 abundances. For asteroids and non-icy satellites, rock-type classification and constraints in chemical abundances of Si, Al, Fe and Ti can be derived from photometry at 2300 and 6500 Å. The IUE telescope already orbiting the earth, the Space Telescope to come, the lunar polar orbiter and other spacecraft under prospect are potentially available to provide the photometric observations at 6500 and 2300 Å required. |
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