Photometric Modeling of Saturn's Rings

Physics – Geophysics

Scientific paper

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Scientific paper

The brightness of Saturn's rings has been measured using a number of instruments on Voyager and Cassini as well as with HST. Not all of the observed characteristics of the rings have been adequately explained. Some quantities are poorly known, such as particle albedos (A), the volume filling factor (D) of the rings and ring particle scattering properties. Many previous ring photometric models have fallen into two camps: those assuming the rings to be a monolayer of particles and those assuming particles are widely spaced (D=0). Here we will present results of modeling ring brightness using the Monte Carlo photometry code of Salo and Karjalainen (2003, Icarus 164, 428). The code allows modeling of a 3D layer of ring particles with an arbitrary D and a choice of ring particle scattering phase functions. We will present preliminary ring brightness results using a variety of D, A and scattering phase function for Cassini viewing geometries. We will discuss the results of these models in the context of understanding realistic ring particle properties.
This work is supported by a Graduate Student Researchers Program Fellowship from NASA Headquarters, the Cassini project, and UC's Institute of Geophysics and Planetary Physics.

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