Polarimetric studies of comet Levy 1990 XX

Details Polarimetric studies of comet Levy 1990 XX Polarimetric studies of comet Levy 1990 XX

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...459..271d&link_type=abstract

Astronomy and Astrophysics, Volume 459, Issue 1, November III 2006, pp.271-273

Astronomy and Astrophysics

Astrophysics

10

Comets: General, Dust, Extinction, Scattering, Polarization

Scientific paper

The spherical and non-spherical dust-grain characteristics of comet Levy 1990 XX are studied in this paper. Using T-matrix theory, a good theoretical fit to the polarisation data observed by Chernova and co-workers for comet Levy 1990 XX is reported in the present work. The calculated degree of linear polarisation (p) as a function of observed scattering angle (θ) produced by prolate spheroidal crystalline olivine particles with effective radius (r_eff=0.218~ μm), effective variance (v_eff= 0.0036), and aspect ratio (E=0.486) are compatible with the comet's observed polarisation at λ= 0.485~ μm. After comparing the above result with the Mie theory result (r_eff=0.115~ μm, v_eff= 0.0465), it is found that prolate grains give the better fit to the observed polarisation data. Also, the negative polarisation behaviour of comet Levy 1990 XX is discussed.

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