Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3606r&link_type=abstract
American Astronomical Society, DPS meeting #39, #36.06; Bulletin of the American Astronomical Society, Vol. 39, p.486
Other
Scientific paper
We have written a model of a cometary nucleus with the objective of calculating water production rates to be compared with the secular light curves of comets presented by Ferrin in this same meeting. The model is based on the paper published by Cowan and A'Hearn (1979). The importance of this model is that it takes into account the pole inclination of the comet, contrarily to many other model available in the literature that only consider a nucleus axis perpendicular to the orbital plane. The model predicts a brightness difference of 300x between a pole perpendicular to the orbital plane vs a pole lying on the orbital plane at R= 2.5 AU. This produces a first order effect in the secular light curve. We can calculate the sublimation rate as a function of latitude on the comet. The temperature gets themalized near the sun because of the sublimation. The thermal conductivity of comets has been found observationally to be very small. However some secular light curves, present significant asymmetries that we will try to explain. The fit to several secular light curves will be presented.
References
Cowan, J.J., A'Hearn, M.F., 1979. Vaporization of comet nuclei:
Light Curves and life times. The Moon and the Planets, 21, 155-171.
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