Abstract.
In the present work, the observed linear polarization data of comet Levy
1990XX
are studied at wavelengths 0.485 mum, 0.540 mu m and 0.670 mu m.
We
propose a model which considers cometary dust as a mixture of compact
and
aggregate particles, with composition of silicate and organic material.
Aggregates correspond to a mixture of Ballistic Cluster-Cluster
Aggregate (BCCA)
and Ballistic Agglomeration with Migration 2 (BAM2) with a
suitable mixing ratio and compact particles correspond to polydisperse
spheroids with different axial ratio (E = 0.08 to 1.2) which includes
prolate,
spherical and oblate particles. It is found from our analysis that the
observed
polarization data of Comet Levy 1900XX at the above three wavelengths
are
successfully reproduced by using the proposed model.