Visible spectral reflectance measurements (0.33–1.1 μm) of the Galilean satellites at many orbital phase angles

L. A. Mc Fadden, J. F. Bell, T. B. Mc Cord

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

One hundred eighty-seven reflectance spectra (0.33–1.10 μm) 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°. Solar phase angle coefficients beyond 0.55 μm 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 μm observed 8.5 years apart show a 6% global reflectance decrease. However, it is difficult to unambigously attribute this particular decrease in reflectance to a change in Io's surface composition.

Original languageEnglish (US)
Pages (from-to)410-430
Number of pages21
JournalIcarus
Volume44
Issue number2
DOIs
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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