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Color photometry of surface features on Ganymede and CallistoVoyager 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.
Document ID
19830035745
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Squyres, S. W.
(NASA Ames Research Center Moffett Field, CA, United States)
Veverka, J.
(Cornell University Ithaca, NY, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Publication Information
Publication: Icarus
Volume: 52
Subject Category
Lunar And Planetary Exploration
Accession Number
83A16963
Funding Number(s)
CONTRACT_GRANT: NSG-7156
Distribution Limits
Public
Copyright
Other

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