Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...66..154f&link_type=abstract
Icarus (ISSN 0019-1035), vol. 66, April 1986, p. 154-164.
Astronomy and Astrophysics
Astronomy
12
Astronomical Models, Cometary Atmospheres, Cosmic Dust, Gas Evolution, Halley'S Comet, Comet Nuclei, Gravitational Fields, Obliqueness, Solar Orbits, Thermal Conductivity, Comets, Gases, Models, Dust, Production Rate, Halley, Periodic Comets, Computer Methods, Comae, Cohesion, Grains, Obliquity, Conductivity, Thermal Properties, Comet Nuclei, Ice, Surface, Crystalline Materials, Calculations, Radius, Flux, Theoretical Studies
Scientific paper
A gas and production model which includes coma effects and a flux integration procedure is used to calculate the gas and dust production rates for Comet Halley for various values of obliquity and thermal conductivity. An analytic procedure is defined for computing idealized nongravitational force components from first principles, assuming a smooth, spherical, homogeneous nucleus. The nongravitational force is thereby obtained along the radial, transverse and normal directions relative to the orbit plane as a function of the heliocentric distance. The latitude and longitude of the force is also obtained. However, the gas and dust production rates calculated with the model differ greatly from the observed production rates. The inaccuracies are attributed to asymmetric nongravitational forces and accelerations at perihelion. This asymmetry suggests that the dependence of the nongravitational acceleration on heliocentric distance during preperihelion is different than during the postperihelion phase of the orbit.
Fanale Fraser P.
Salvail James R.
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