Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..839e&link_type=abstract
Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 839, 1987
Astronomy and Astrophysics
Astrophysics
21
Scientific paper
The infrared thermal emission of the nucleus of Halley's comet was measured by the imaging channel of the IKS spectrometer in two wavelengths bands (7-10 μm and 9-14 μm) and in two perpendicular directions of analysis. The effective dimensions of the infrared emissive region in these directions are estimated from a simulation of the flyby configuration, and compared to observations made in the visible range. A colour temperature larger than 360 K was deduced using on-ground preflight calibrations. A temperature of the same order is obtained independently, comparing the absolute value of the measured fluxes with model simulations. Such temperatures, significantly higher than the sublimating temperature of ices, and near the blackbody temperatures at 0.8 au, suggest the existence of an essentially inactive dark crust covering a significant part of the surface of the nucleus.
Bibring Jean-Pierre
Combes Michel
Coron N.
Crovisier Jacques
Emerich Claude
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