Near-infrared spectra of the Galilean satellites - Observations and compositional implications

Details Near-infrared spectra of the Galilean satellites - Observations and compositional implications Near-infrared spectra of the Galilean satellites - Observations and compositional implications

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...36..271p&link_type=abstract

Icarus, vol. 36, Dec. 1978, p. 271-303.

Astronomy and Astrophysics

Astronomy

28

Astronomical Spectroscopy, Galilean Satellites, Infrared Astronomy, Near Infrared Radiation, Planetary Composition, Spectral Reflectance, Albedo, Astronomical Models, Carbonates, Feldspars, Hydroxyl Compounds, Ice, Infrared Spectra, Iron Compounds, Nitrates, Planetary Surfaces, Water, Absorption Spectra, Alkalies, Infrared, Sulfur, Jupiter, Spectral Reflectivity, Satellites, Callisto, Ganymede, Europa, Wavelengths, Spectrum, Io, Spectrometers, Water, Ice, Models, Nitrates, Surface, Composition, Albedo, Obse

Scientific paper

Reflectivity spectra of the trailing and leading sides of Io, Europa, Callisto, and Ganymede are analyzed which were obtained at an altitude of 41,000 ft from the Kuiper Airborne Observatory with circular variable filter-wheel spectrometers in the spectral region from 0.7 to 5.5 microns. The data are compared with laboratory spectrum and with synthetic spectra constructed on the basis of simple multiscattering theory. The 2.9-micron feature in Callisto's spectra is attributed primarily to bound water; the fractional amounts of water-ice cover on the trailing and leading sides of Ganymede and on the leading side of Europa are estimated. The bare-ground areas on Ganymede are shown to have reflectivity properties comparable to those of Callisto's surface in the studied spectral region, and the surfaces of both satellites are found to contain significant quantities of bound water. It is suggested that minor but significant amounts of ferrous-bearing material (either ferrous salts or alkali feldspars) can account for the 1.35-micron feature of Io.

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