Near-infrared studies of Comet Halley: Polarization and color

Details Near-infrared studies of Comet Halley: Polarization and color Near-infrared studies of Comet Halley: Polarization and color

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b..87b&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 87-89 (SEE N87

Computer Science

Color, Cosmic Dust, Halley'S Comet, Linear Polarization, Near Infrared Radiation, Light Scattering, Phase Shift, Space Observations (From Earth), West Comet

Scientific paper

The linear polarization and color of comet Halley in broadband filters J(1.25 microns), H(1.65 microns) and K(2.2 microns) were measured at phase angles (beta) between 9.4 and 65.3 deg from Sept. 1985 to May 1986. Halley exhibits a red color characteristic of comet dust at these wavelengths with no clear variation with Beta. The JHK polarizations reach 25% at the largest Beta with a reversal at 20 deg and negative polarizations of a few per cent at smaller Beta. The polarization increases with wavelength at the larger phase angles. Models of the near-infrared polarization versus phase angle for comet West fail to match the present observations. Calculations of polarization incorporating two components and power-law grain size distributions provide better agreement.

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