Scattering properties of cometary grains: Comet P/Halley

Details Scattering properties of cometary grains: Comet P/Halley Scattering properties of cometary grains: Comet P/Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b..47j&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 47-51 (SEE N87

Other

1

Cosmic Dust, Halley'S Comet, Light Scattering, Space Observations (From Earth), Continuums, Particle Size Distribution, Radiation Pressure, Red Shift, Reflectance

Scientific paper

Two ground based investigations into the scattering properties of cometary grains are reported. Spectral observations at a resolution of 20A show that the optical reflectivity of the continuum increases with wavelength. However, the reflectivity gradients decrease with increasing wavelength, the scattering becoming neutral near 2.5 microns, and blue at 2.5 microns. Optical and near infrared data are consistent with the scattering expected from power law grain size distributions with cross section weighted mean radii greater than 1 micron. The optical continuum of comet P/Halley is reddened with respect to the Sun by 10 + or - 2%/1000A, placing P/Halley within the range of other comets in terms of its continuum colors. The reflectivity gradient in P/Halley is a function of position in the coma. The grain coma on the sunward side of the nucleus is redder than on the tailward side. The rate of change of the reflectivity gradient with respect to distance along the tail axis is 0.01% per 1000A per arcsec. Grain size sorting by solar radiation pressure is indicated.

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