Other
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...63..206m&link_type=abstract
Icarus (ISSN 0019-1035), vol. 63, Aug. 1985, p. 206-216.
Other
9
Phase Shift, Polarimetry, Polarization Characteristics, Tempel 2 Comet, Albedo, Asteroids, Comets, Polarization, Kopff, Tempel 2, Photopolarimetry, Observations, Phase Angles, Color, Analysis, Comparisons, Models, Scattering, Albedo
Scientific paper
Comets Kopff (1982k) and Tempel 2 (1982d) were observed with a photopolarimeter. The observations spanned phase angles of 10 - 30° for comet Kopff and of 45° for comet Tempel 2. The comet Kopff observations were near the phase angle where the position angle of the polarization switches from parallel to perpendicular to the scattering plane. The polarization showed no color dependence in the V, R, and I filters. The polarization of comet Kopff as a function of phase angle resembles polarization curves of asteroids. The minimum polarization was -1.5±0.1%. The data from comet Kopff and four other comts were combined in a polarization versus phase-angle diagram. The coincidence of the data was remarkable. The collection of comet data determined a crossover phase angle of 22±0° and a polarimetric slope of 0.34±0.01% per degree. Mie models were unable to represent the group polarization curve. The comet polarization implies an albedo.
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