Masses and densities of Comets Halley and Kopf

Details Masses and densities of Comets Halley and Kopf Masses and densities of Comets Halley and Kopf

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.249..195r&link_type=abstract

In ESA Proceedings of an ESA Workshop on the Comet Nucleus Sample Return Mission p 195-205 (SEE N87-25109 18-90)

Physics

47

Density (Mass/Volume), Halley'S Comet, Mass, Ice, Outgassing, Sublimation, Thermal Conductivity

Scientific paper

Mass determination of cometary nuclei using nongravitational forces is reviewed and it is shown that accurate results can be reached if proper account can be taken of the influence of gas production perihelion asymmetry on the nongravitational effect. This requires that the gas production curve can be monitored with reasonable precision and that observations of the gas production pattern can set narrow limits on the average sublimation lag angle projected onto the orbital plane. Large uncertainties remain even for P/Halley but rho = 0.1 to 0.2 g/cc can be estimated. For P/Kopf only rough limits can be set, but this indicates a density which is probably even lower. A very high thermal conductivity appears necessary for comet Kopf. By neglecting H2O production from icy grains, cometary densities may be overestimated.

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