EDP Sciences
Free access
Issue
A&A
Volume 440, Number 3, September IV 2005
Page(s) 1177 - 1182
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20053199


A&A 440, 1177-1182 (2005)
DOI: 10.1051/0004-6361:20053199

Ground reference for space remote sensing

Laboratory photometry of an asteroid model
S. Kaasalainen1, M. Kaasalainen2 and J. Piironen3

1  Finnish Geodetic Institute, Department of remote sensing and photogrammetry, Geodeetinrinne 2, 02431 Masala, Finland
    e-mail: Sanna.Kaasalainen@fgi.fi
2  Department of Mathematics and Statistics, PO Box 68, 00014 University of Helsinki, Finland
    e-mail: mjk@rni.helsinki.fi
3  Finnish Geodetic Institute, Department of geodesy and geodynamics, Geodeetinrinne 2, 02431 Masala, Finland
    e-mail: Jukka.Piironen@fgi.fi

(Received 6 April 2004 / Accepted 25 May 2005 )

Abstract
We present accurate laboratory CCD photometry of an artificial asteroid sample. The standard inversion method for asteroid lightcurves was implemented to reproduce the measured lightcurves and to derive the global shape, spin state and pole direction to be compared with the known laboratory values. The results imply that the inversion analysis works universally for targets of arbitrary surface composition, i.e., the scattering law does not play a strong role in the analysis. We further investigated the scattering behaviour of the surface material by direct laboratory measurements, and found that the illumination phase angle dependence can be factorized for this material in the same way as for asteroids.


Key words: methods: laboratory -- techniques: photometric -- methods: numerical -- scattering -- minor planets, asteroids




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