HCN and CN in Comet 2P/Encke: Models of the non-isotropic, rotation-modulated coma

Details HCN and CN in Comet 2P/Encke: Models of the non-isotropic, rotation-modulated coma HCN and CN in Comet 2P/Encke: Models of the non-isotropic, rotation-modulated coma

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1263j&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1263

Physics

Scientific paper

Axisymmetric models of the outgassing of a cometary nucleus have been constructed. The outgassing capability of the nucleus (response of outgassing to solar energy input) is assumed symmetric with respect to an axis different from the rotation axis. Such models can be used to describe a nucleus with a single active region, in particular if the active region is located not far from one of the rotation poles of the nucleus. The models may include a solar zenith angle dependence of the outgassing. They retrieve the outgassing flux at distances from the nucleus where collisions between molecules are unimportant, as function of the angle with respect to the outgassing axis. The observed emissions must be optically thin. Furthermore the models assume that the outflow speed at large distance from the nucleus does not depend on direction. The value of the outflow speed is retrieved. The models are applied to CN images and HCN spectra of Comet 2P/Encke, obtained nearly simultaneously in November 2003 with the 2m optical telescope on Mount Rozhen, Bulgaria, and with the 10m Heinrich Hertz Submillimeter Telescope on Mount Graham, Arizona, USA. According to Sekanina (1988), at that time, more than one month before perihelion, of his two outgassing sources source I was still active, the source receiving sunlight during most of Comet Encke's orbit. This means that conditions on Comet Encke were favorable for the application of an axisymmetric model.

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