Light Scattering as a Clue to Cometary Dust Structure

Details Light Scattering as a Clue to Cometary Dust Structure Light Scattering as a Clue to Cometary Dust Structure

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..498l&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Knowing the physical properties of cometary dust particles should provide direct information about their (likely) formation by aggregation of interstellar dust grains. While unique in-situ observations are most limited remote observations of solar light scattered by cometary dust particles (phase angle and wavelength dependence of the brightness and polarization and their derivatives) provide significant constraints. Our present understanding of the physical properties of these irregular dust particles will be reviewed. The need for laboratory measurements (avoiding sedimentation and multiple scattering on gravity packed layers) to interpret the observations in terms of morphology size distribution albedo and porosity will be emphasized. The feasibility of such measurements on dust clouds and on the aggregates they form under micro-gravity conditions will be demonstrated. The opportunity offered by the ICAPS/IMPF space station facility (now in phase B at ESA) to deduce without any ambiguity the physical properties of (icy) dust particles from their optical properties as well as their evolution when they evaporate break-off or aggregate will be discussed. Finally the latest developments of the ICAPS-Sounding Rocket Experiment to be flown in 2004 on board the ESA MASER 10 rocket will be presented.

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