Abstract
Results on the polarimetric properties of cometary dust are updated, with emphasis on the phase angle and wavelength dependences. They are compared to results obtained for asteroids and interplanetary dust. Noticeable differences are found between the cometary dust and the S-type asteroids polarization color. Interpretation through laboratory measurements performed under reduced gravity conditions suggests that dust in cometary comae consists of highly porous aggregates. Numerous measurements are expected to be performed with ICAPS on board the ISS, to monitor the evolution of the light scattering properties of the dust particles while they aggregate and, possibly, while ices condense on or evaporate from them under different physical conditions.
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