Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...52..117s&link_type=abstract
Icarus, vol. 52, Oct. 1982, p. 117-125.
Astronomy and Astrophysics
Astronomy
7
Astronomical Photometry, Callisto, Ganymede, Light Scattering, Phase Shift, Satellite Surfaces, Visual Photometry, Albedo, Spectral Reflectance, Voyager Project, Jupiter, Satellites, Colors, Photometry, Surface, Features, Ganymede, Callisto, Voyager 1, Imagery, Scattering, Terrain, Wavelengths, Data, Telescopic Observations, Analysis, Albedo, Maps, Grooves, Craters, Polar Regions, Spectra
Scientific paper
Voyager imaging data demonstrate that the scattering properties ('phase curves') of all major terrain types on Ganymede and Callisto are not significantly wavelength dependent between 0.4 and 0.6 micron. The data suggest that the phase curves may be slightly steeper at the shorter wavelengths, consistent with the trend of telescopic observations near opposition. However, the differences are small and entirely within the uncertainties of the analysis. The result indicates that the phase integrals (0.8 for Ganymede and 0.6 for Callisto) derived by S. W. Squyres and J. Veverka (1981) from the abundant Voyager clear filter observations are reliable measures of the radiometric phase integrals. The corresponding values of the Bond albedo turn out to be 0.35 for Ganymede and 0.11 for Callisto.
Squyres Steve W.
Veverka Joe
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