Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0704t&link_type=abstract
American Astronomical Society, DPS meeting #28, #07.04; Bulletin of the American Astronomical Society, Vol. 28, p.1081
Astronomy and Astrophysics
Astronomy
Scientific paper
A thermophysical model, used to compute the surface temperature distribution of spherical asteroids taking into account thermal inertia and rotational characteristics, has been developed to incorporate tri-axial ellipsoidal geometry and arbitrary spin axis orientation. The numerical model has been used to investigate the thermal IR fluxes from Kuiper Belt Objects, particularly at wavelengths at which detection by the ISOPHOT instrument on ISO appears feasible. The dependence of the fluxes on the magnitude of the thermal parameter, the orientation of the spin axis, and the ratio of the major and minor axes are described for an assumed prolate ellipsoid. Comparisons with ground-based observations of 2060 Chiron are made showing that values of the thermal parameter less than 1 can be reconciled with the data. A sublimation term has been incorporated into the thermophysical model and it is shown that sublimation of CO_2 ice from KBOs will have little effect on the surface temperature while outgassing rates in excess of 10(16) molecule m(-2) s(-1) are possible.
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