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Spherical albedo of a Lommel-Seeliger scattering ellipsoidal asteroid

Published online by Cambridge University Press:  01 March 2016

Karri Muinonen  and
Olli Wilkman
Karri Muinonen
Affiliation:
Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, P.O. Box 64, FI-00014 U. Helsinki, Finland email: [email protected] Finnish Geospatial Research Institute, Geodeetinrinne 2, FI-02430 Masala, Finland
Olli Wilkman
Affiliation:
Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, P.O. Box 64, FI-00014 U. Helsinki, Finland email: [email protected]
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Abstract

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We compute the spherical albedo for a Lommel-Seeliger scattering ellipsoidal asteroid with a realistic disk-integrated phase function. The spherical (or Bond) albedo gives the ratio of the fluxes incident on and scattered by an asteroid. Thus, it plays a key role in the determination of the flux absorbed and afterwards thermally emitted by the asteroid at longer wavelengths. We provide extensive computations for the spherical albedo of low-albedo and moderate-albedo asteroids by utilizing the analytical disk-integrated brightness of a Lommel-Seeliger ellipsoid. In doing so, we utilize realistic triaxial models of known asteroids as well as idealistic prolate or oblate models of substantial elongation or flatness, respectively. We show that the spherical albedos can vary significantly as a function of the rotational pole orientation, rotational phase, and the triaxial ellipsoidal shape: variations of the order of 5-10% are realistic, with a tendency to grow with increasing elongation or flatness of the shape.

Keywords

Minor planetsasteroidssolar system: generalradiative transferscatteringmethods: analyticalmethods: numericaltechniques: photometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S318: Asteroids: New Observations, New Models , August 2015 , pp. 206 - 211
Copyright
Copyright © International Astronomical Union 2016 

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