Visible spectral reflectance measurements /0.33-1.1 microns/ of the Galilean satellites at many orbital phase angles

Details Visible spectral reflectance measurements /0.33-1.1 microns/ of the Galilean satellites at many orbital phase angles Visible spectral reflectance measurements /0.33-1.1 microns/ of the Galilean satellites at many orbital phase angles

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...44..410m&link_type=abstract

(IAU, American Astronautical Society, COSPAR, University of Hawaii, and NASA, Colloquium on the Satellites of Jupiter, 57th, Kai

Astronomy and Astrophysics

Astronomy

29

Angular Correlation, Astronomical Spectroscopy, Galilean Satellites, Optical Reflection, Spectral Reflectance, Voyager 1977 Mission, Data Reduction, Imaging Techniques, Solar Position, Tables (Data), Visible Spectrum, Wavelengths

Scientific paper

One hundred eighty-seven reflectance spectra (0.33-1.10 microns) of the Galilean satellites have been obtained. Solar phase angle color correction coefficients were derived and the spectra corrected to a solar phase of 6 deg. Solar phase angle coefficients beyond 0.55 micron are presented for the first time. The spectra as a function of orbital phase angle are presented in the form of images to display hemispheric spectral variations. Io and Europa are redder on their trailing hemispheres while Callisto is redder on its leading hemisphere. Ganymede shows small longitudinal color variations despite the complex albedo structure visible in Voyager images. Comparisons of these data with previous measurements reveal that most differences can be attributed to the solar calibration. Reflectance measurements of Io at 0.73 micron observed 8.5 years apart show a 6% global reflectance decrease. However, it is difficult to unambiguously attribute this particular decrease in reflectance to a change in Io's surface composition.

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