Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...46..354c&link_type=abstract
Icarus, vol. 46, June 1981, p. 354-360.
Astronomy and Astrophysics
Astronomy
17
Infrared Astronomy, Infrared Spectra, Rhea (Astronomy), Satellite Surfaces, Ganymede, Ice, Infrared Telescopes, Minerals, Spectral Reflectance, Spectral Resolution, Water, Saturn, Satellites, Rhea, Infrared, Spectrum, Water, Ice, Ganymede, Absorption, Comparisons, Surface, Composition, Data, Wavelengths, Reflectance, Observations
Scientific paper
The reflectance spectrum of the leading side of the Saturnian satellite Rhea in the 0.65 to 2.5 micron range is reported and used to quantify the amount of water and other materials present on the surface. Data were obtained with 1.5% spectral resolution and 3 to 5% precision by the 3.0-m Infrared Telescope Facility at Mauna Kea Observatory with a continuously scanning circular variable filter spectrometer. Water ice absorptions previously identified at 2.02, 1.65 and 1.55 microns are confirmed, and additional absorptions at 1.25 and probably 1.04 microns are identified. The spectrum of Rhea is noted to be very similar to that of the leading side of Ganymede in the 0.6 to 2.5 micron region and to laboratory spectra of water frost on ice blocks rather than an optically thick frost. Results indicate that the leading side of Rhea is at least 90 wt % water ice, and may be as much as 98 wt %. Of the remaining material, neither clathrates nor minerals is excluded.
Clark Roger Nelson
Owensby Pamela D.
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