Comets Okazaki-Levy-Rundenko (1989 19) and Levy (1990 20): Polarimetry and stellar occultations

Details Comets Okazaki-Levy-Rundenko (1989 19) and Levy (1990 20): Polarimetry and stellar occultations Comets Okazaki-Levy-Rundenko (1989 19) and Levy (1990 20): Polarimetry and stellar occultations

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..108...81r&link_type=abstract

Icarus, vol. 108, no. 1, p. 81-91

Astronomy and Astrophysics

Astronomy

11

Astronomical Polarimetry, Comet Nuclei, Comets, Okazaki-Levy-Rudenko Comet, Polarization (Waves), Stellar Occultation, Optical Thickness, Polarimeters

Scientific paper

The results of polarimetric observations of comets Okazaki-Levy-Rudenko 1989 19 and Levy 1990 20 and two stellar occultations by the latter comet are presented. Wavelength, phase angle, and aperture dependences of polarization are discussed. During the outburst activity of comet Levy variations of the polarization parameters were registered. From a stellar occulation by comet Levy the optical thickness of the coma is found to be tau = 0.40 +/- 0.06 at a distance of 3500 km from the nucleus on the sunward side. The measured light flux, negative polarization, and high optical thickness in the observed regions of coma assume the presence in the coma of either a large number of Rayleigh particles with addition of some large ones, or a large number of absorbing fluffy grains on which multiple reflections of light are possible, or their mixture. Analysis of the polarimetric observations of occulted stars by the comet indicates the presence of oriented nonspherical particles in the coma. The observations of stellar occultations are seen to be useful probes of oriented and Rayleigh particles.

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