Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986plas.rept...78b&link_type=abstract
In NASA, Washington Reports of Planetary Astronomy, 1985 p 78-79 (SEE N87-12407 03-89)
Astronomy and Astrophysics
Astronomy
Absorption Spectra, Europa, Infrared Spectra, Spectral Reflectance, Stellar Occultation, Ammonia, Sulfur Compounds, Thermal Radiation, Voyager Project
Scientific paper
Observations of Europa using the Cooled Grating Array Spectrometer have resulted in the discovery of new absorption features in the spectrum of the trailing side of Europa which have been attributed to either magnetospherically implanted sulfur compounds or recently emplaced hydrates of ammonia. More observations are planned to determine which of these two classes of compounds are responsible. Two asteroid occultations have been observed so far, but with some negative results (the occultations paths shifted sufficiently that the groups responsible for timing the visual occultation got no data). High-quality data in the thermal infrared were obtained nevertheless; those data are useful for constraint of thermal models of asteroids and will be analyzed in that context. Work was completed to perfect a computer code that will fit a triaxial-ellipsoid thermal model to the IR data while constrained by the visual lightcurve.
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