Photometric and polarimetric opposition effects of simulated planetary regoliths

Details Photometric and polarimetric opposition effects of simulated planetary regoliths Photometric and polarimetric opposition effects of simulated planetary regoliths

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..209s&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 209-212

Computer Science

Scientific paper

We present results from simultaneous photometric and polarimetric laboratory measurements of samples that have different microcrystalline structures and albedos. The studies were conducted using the Kharkiv Observatory laboratory polarimeter at a wavelength of 0.65 μm and phase angles covering 0.1o-3.5o. This polarimeter was calibrated with a comparable instrument at JPL NASA. Surfaces formed by smoked deposits of MgO and carbon soot show similar prominent negative branches of polarization with minima near 2.0o and depths near 1%, despite the fact that they have extremely different albedos and brightness opposition effects. The results for carbon soot allow to predict a narrow negative polarization branch for some dark asteroids. A strong particle-size dependence of the negative polarization parameters for powdered dielectric surfaces was found. Particle-size separates of Al2O3 (0.1, 0.5, 1, 7, and 12 μm) with almost the same albedo were studied. For grain larger than 1 μm the depth of negative polarization does not exceed 0.2%. It is maximal (0.8%) for the 0.1 and 0.5 μm fractions. The angular width of the opposition spikes of all the separates are very similar. These data are important to interpret photometric and polarimetric opposition effects of icy satellites of outer planets and bright asteroids.

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