Computer Science
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.251w&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 251-254 (SEE N
Computer Science
Comet Nuclei, Cosmic Dust, Evaporation, Halley'S Comet, Albedo, Chemical Composition, Particle Size Distribution
Scientific paper
It is suggested that the organic grains streaming from Halley's nucleus lose substantial volatile constitutents within 100,000 sec. Evidence includes the increasing fraction of organic to mineral grains nearer the nucleus. The high C and CH content in the gas and plasma phases, reduced CO within 15,000 km, the different behavior of OH and H strengths with heliocentric distance, the large surface area needed to explain radiation-driven sublimation, and the appearance of the 10 micron IR feature only within 1.3 AU. While submicron grains of ice contaminated by 1% or more absorptive graphite can explain the strong OH coma far from the Sun, as in comet Bowell at 4.6 AU, the dynamical lifetime of the grain coma implies mm-sized and therefore cooler grains, with lower H2O or OH attachment energies near 10 kcal/mole. Grains in comet Halley, if composed of similar organic material must also contain fractions of more strongly bound components. Kerogen is adopted as a prototype organic complex having a range of bond energies.
Rabilizirov R.
Wallis Max K.
Wickramasinghe Chandra N.
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