• Charging in Saturn's magnetosphere is not particularly sensitive to the dust particle's material properties. This is a large contrast to dust particles in Earth's magnetosphere, where small material property changes have a big effect on the equilibrium potential.

• The charging time for one micron-sized particles is a few minutes, and for 0.01 micron-sized particles the charging time is 6 hours (or more). The latter is a signf-icant fraction of Saturn's rotation period.

Acknowledgements. We are very grateful to M. Horanyi, Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, for his Saturn plasma data and helpful guidance on dust particle charging mechanisms.

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