Complex refractive index of grain material deduced from the visible polarimetry of comet P/Halley

  • T. Mukai
  • S. Mukai
  • S. Kikuchi
Conference paper


Visible polarimetry of comet Halley over the phase angle α (sun-comet-earth angle) from 1°.6 to 64°.4 has shown negative values of the polarization p in α ≤20° and linearly increase of p with α > 20°. In addition, a slight increase of p with wavelength λ is likely to exist. By applying the Mie calculations to explain both α -and λ-dependences of p, we have found that it’s likely for the cometary dust to consist of the material with the average complex refractive index (m = n − i• k), i.e. (n, k) = (1.392, 0.024) at λ = 0.365 μm, (1.387, 0.031) at λ= 0.484 μm, (1.385, 0.035) at λ= 0.62 μm and (1.383, 0.038) at λ = 0.73 μm, for grains assumed to have the size spectrum reported by the Vega missions.

Key words

complex refractive index of grain material cometary dust comet Halley 


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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • T. Mukai
    • 1
  • S. Mukai
    • 1
  • S. Kikuchi
    • 2
  1. 1.Kanazawa Institute of TechnologyNonoichi, Ishikawa 921Japan
  2. 2.Tokyo Astronomical ObservatoryMitaka, Tokyo 181Japan

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