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Laboratory Simulation of Icy Cometary Nuclei

Published online by Cambridge University Press:  14 August 2015

E. A. Kajmakov  and
V. I. Sharkov
E. A. Kajmakov
Affiliation:
A. F. Ioffe Institute of Physics and Technology, Leningrad, U.S.S.R.
V. I. Sharkov
Affiliation:
A. F. Ioffe Institute of Physics and Technology, Leningrad, U.S.S.R.

Abstract

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The problems of laboratory simulation of cometary phenomena are discussed. Results are given of experimental investigations of the thermodynamic parameters of H2O ice and of frozen mixtures of electrolytes during sublimation under conditions of high vacuum and low temperature. At a distance of 1 AU from the Sun the equilibrium temperature of H2O ice is shown to be about −75 °C. Conditions are determined for the formation and disintegration of dust matrices during the sublimation of ices containing small dust particles. Dust particles are shown to leave the surface of the ice in the form of conglomerates of primary particles. The outflow velocities of the particles are found to be as high as several metres per second. The results obtained are discussed in relation to cometary phenomena.

Type
Part IV/Physical Processes in Comets
Information
Symposium - International Astronomical Union , Volume 45: The Motion, Evolution of Orbits and Origin of Comets , 1972 , pp. 308 - 315
Copyright
Copyright © Reidel 1972 

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