Groundbased infrared imaging of Comet Giacobini-Zinner - The distribution of dust during the ICE flyby

Details Groundbased infrared imaging of Comet Giacobini-Zinner - The distribution of dust during the ICE flyby Groundbased infrared imaging of Comet Giacobini-Zinner - The distribution of dust during the ICE flyby

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..295c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, March 1986, p. 295-298.

Physics

10

Giacobini-Zinner Comet, Infrared Imagery, International Sun Earth Explorer 3, Interplanetary Dust, Space Observations (From Earth), Comet Tails, Impact, Particle Size Distribution, Spatial Distribution, Temperature Gradients, Comets, Giacobini-Zinner, Ice Mission, Spacecraft Observations, Imagery, Dust, Distribution, Earth-Based Observations, Infrared, Production Rates, Wavelengths, Comae, Impacts, Calculations, Particles, Size, Comparisons

Scientific paper

A thermal-infrared image of Comet Giacobini-Zinner has been used to determine the spatial distribution of dust grains in the Comet's coma. In the present paper the results of this imaging which bear on the expected impact rate of dust grains on the International Cometary Explorer (ICE) are emphasized. The expected impact rate is calculated for a range of grain radii. For particle sizes comparable to those inferred for most comets, the impact rate is on the order of several hundred per second. This rate is in agreement with the predictions by Divine (1985), but it is more than two orders of magnitude larger than the rate observed by ICE if the observed impacts were on the spacecraft body. However, the observed impact rate is roughly comparable to that inferred from the infrared imaging if, as suggested by Gurnett et al. (1986), the impacts were on the ICE antennae, which had a much smaller cross-sectional area than the spacecraft body.

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