Comptes Rendus
no. 7
Quantitative modeling of the spectral reflectance of Kuiper Belt objects and Centaurs
[Modélisation quantitative des spectres de réflectance des objets de la ceinture de Kuiper et des Centaures]

Présenté par : Pierre Encrenaz

Dale P. Cruikshank1  ; Ted L. Roush1  ; François Poulet2
1 NASA Ames Research Center, Moffett Field, CA 94035, USA
2 IAS, Université Paris-Sud, 91405 Orsay cedex, France
Comptes Rendus. Physique, Volume 4 (2003) no. 7, pp. 783-789.

La spectroscopie de réflectance des corps du système solaire est un moyen très efficace pour déterminer la composition de leurs surfaces (minéraux, glaces, composants carbonés, et matériaux composés de macromolécules). Des modèles basés sur les théories de transfert radiatif simulent la diffusion de la lumière solaire sur la surface planétaire solide, ce qui permet alors de contraindre quantitativement la composition, l'abondance et l'état physique des matériaux présents sur la surface ainsi que sa microstructure. Les théories de diffusion d'Hapke et de Shkuratov qui sont communément utilisées pour modéliser les données spectrales des objets de Kuiper, des Centaures, et d'autres corps solides du système solaire sont discutées et comparées. Les deux théories sont alors utilisées pour reproduire les spectres du Centaure Pholus 5145. Le même mélange constitué de 5 composants (glaces, un composant carboné, un silicate, et un composant organique) permet de reproduire le spectre de cet objet avec les deux théories, cependant les abundances différent de manière importante.

Reflectance spectroscopy of Solar System bodies provides a rich source of information on their compositions (minerals, ices, metals, and macromolecular carbon-bearing materials). Models calculated with radiative transfer theories for the spectral distribution of diffusely scattered sunlight from planetary surfaces yield information on the compositions, abundances, physical states, layering, and particle microstructure of those surfaces. We discuss and evaluate the scattering theories of Hapke and Shkuratov that are widely used for modeling the reflectance spectra and color data for Kuiper Belt objects, Centaur objects, and other airless bodies in the Solar System. Both theories yield good models of the reflectance spectrum of Centaur 5145 Pholus using five components (ices, carbon, a silicate mineral, and a complex organic material), although the derived abundances differ widely.

Publié le :
DOI : 10.1016/j.crhy.2003.10.007
Keywords: Kuiper Belt, Centaur objects, Light scattering, Spectroscopy
Mot clés : objets de Kuiper, objets Centaures, Diffusion de la lumière, Spectroscopie
Dale P. Cruikshank 1 ; Ted L. Roush 1 ; François Poulet 2

1 NASA Ames Research Center, Moffett Field, CA 94035, USA
2 IAS, Université Paris-Sud, 91405 Orsay cedex, France 
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Dale P. Cruikshank; Ted L. Roush; François Poulet. Quantitative modeling of the spectral reflectance of Kuiper Belt objects and Centaurs. Comptes Rendus. Physique, Volume 4 (2003) no. 7, pp. 783-789. doi : 10.1016/j.crhy.2003.10.007. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2003.10.007/

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