Temperature profiles and thermal stresses in cometary nuclei

Details Temperature profiles and thermal stresses in cometary nuclei Temperature profiles and thermal stresses in cometary nuclei

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...60..512k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 60, Dec. 1984, p. 512-521.

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49

Comet Nuclei, Halley'S Comet, Temperature Profiles, Thermal Analysis, Thermal Stresses, Ice, Solar Orbits, Surface Temperature, Thermal Diffusion

Scientific paper

Assuming a spherical nucleus of water ice with an isothermal surface, temperature profiles are computed for several heliocentric distances of Halley's comet. Sublimation of ice and the temperature dependence of the material properties are taken into account. The resulting strongly nonlinear heat diffusion problem is solved numerically. With some simplifications an analytical solution is derived. The heat conduction causes a "thermal hysteresis" of the surface temperature and a slow increase of the inner temperature. The complete thermal equilibrium is reached, however, only after 100 or more revolutions in the inner solar system. The calculated temperature profiles are used to estimate the thermal stresses in the nucleus. It is shown that thermal stresses can give a plausible explanation for cometary outbursts and splits.

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