Computer Science
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..305g&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 305-314 (SEE N88-21884 14-91)
Computer Science
2
Cosmic Dust, Halley'S Comet, Comet Nuclei, Flyby Missions, Mass Distribution, Outgassing
Scientific paper
Previously unknown phenomena involving dust and new properties of cometary matter observed by the space probes to Comet Halley as well as by Earth-based observations are reviewed. Observation of the coma boundaries for particles in the mass range 10 to the minus 16th to minus 10th power g is mostly compatible with optically absorbing particles. The observed variability of the dust flux of a factor 3 to 5 is due to spatially and time varying dust emission on the nuclear surface. Because of the flat shape of the cumulative mass distribution, the total dust mass production critically depends on the mass of the largest particle emitted from the nucleus which escaped detection by the space probes. Therefore the dust to gas mass ratio cannot be accurately assessed. A value of 1.5 seems to be an upper limit for this ratio.
Gruen Eberhard
Massonne L.
Schwehm Gerhard
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