Solar phase curves and phase integrals for the leading and trailing hemispheres of Iapetus from the Cassini Visual Infrared Mapping Spectrometer |
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Authors: | David G Blackburn Bonnie J Buratti Joel A Mosher |
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Institution: | a Arkansas Center for Space and Planetary Sciences, University of Arkansas, 202 Old Museum Bldg., Fayetteville, AR 72701, United States b Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Drove Dr. 183-501, Pasadena, CA 91109, United States |
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Abstract: | We performed photometry of Cassini Visual Infrared Mapping Spectrometer observations of Iapetus to produce the first phase integrals calculated directly from solar phase curves of Iapetus for the leading hemisphere and to estimate the phase integrals for the trailing hemisphere. We also explored the phase integral dependence on wavelength and geometric albedo. The extreme dichotomy of the brightness of the leading and trailing sides of Iapetus is reflected in their phase integrals. Our phase integrals, which are lower than the results of Morrison et al. (Morrison, D., Jones, T.J., Cruikshank, D.P., Murphy, R.E. 1975]. Icarus 24, 157-171) and Squyres et al. (Squyres, S.W., Buratti, B.J., Veverka, J., Sagan, C. 1984]. Icarus 59, 426-435), have profound implications on the energy balance and volatile transport on this icy satellite. |
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Keywords: | Iapetus Photometry Satellites Surfaces |
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