Some consequences of a phase transition of water ice on the heat balance of comet nuclei

Details Some consequences of a phase transition of water ice on the heat balance of comet nuclei Some consequences of a phase transition of water ice on the heat balance of comet nuclei

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...47..320k&link_type=abstract

(International Astronomical Union and American Astronomical Society, Colloquium on Comets: Gases, Ices, Grains, and Plasma, 61st

Astronomy and Astrophysics

Astronomy

101

Comet Nuclei, Conductive Heat Transfer, Ice, Phase Transformations, Surface Temperature, Water, Chemical Composition, Temperature Distribution, Thermal Conductivity, Comets, Comet Nuclei, Phase Changes, Water, Ice, Heat, Orbits, Data, Perihelion, Evaporation, Surface, Temperatures, Conduction, Interiors, Experiments, Distance, Eccentricity, Crystalline, Tempel 2 Comet, Halley Comet, Procedure, Composition, Porosity, Diffusion, Chemistry

Scientific paper

The surface temperature is numerically calculated for two extreme situations encountered by spheres of water ice or 'inactive ice bodies', of about 1 km radius, moving on three different orbits with a common perihelion distance of 8 AU: (1) where the spheres are composed of amorphous ice, with heat conduction to the interior presumed to be negligible; and (2) where the spheres are composed of compact, hexagonal ice having a heat conduction coefficient known from laboratory experiments. It is found that while the temperature is an unambiguous function of heliocentric distance in the first case, thermal hysteresis and a phase lag of the maximum temperature with respect to perihelion are observed in the second. It is concluded that an ice body moving on the orbit of Tempel 2 must contain crystalline ice, and that the variations of the surface temperature must be smoothed out.

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