Polarimetric properties of Comet Austin

Details Polarimetric properties of Comet Austin Polarimetric properties of Comet Austin

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..738s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 15, 1991, p. 738-742. Research supported by D

Physics

Optics

18

Astronomical Polarimetry, Austin Comet, Cassegrain Optics, Mie Scattering, Particle Size Distribution, Perihelions, Telescopes

Scientific paper

The polarization associated with the passage of Comet Austin is studied analytically by comparing the observational data of the comet with those from the study of Comet P/Halley. A set of narrow-band interference filters are utilized to conduct multicolor polarimetry at phase angles that cover both the pre- and post-perihelion passages. Mie theory is employed to facilitate the data comparison, and it is theorized that the polarimetric scattering in both comets is related to two different grain types. The grain types can be characterized by distinct complex refractive indices, by different size distributions, or by both. Two alternative interpretations are also offered which consider the possibilities of finer grain structure in the Comet Austin and/or the contribution of fluffy dark grains.

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