Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mmsai..73..650l&link_type=abstract
in Memorie della Società' Astronomica Italiana, vol. 73, no. 3, p. 650
Astronomy and Astrophysics
Astronomy
Scientific paper
The numerical modelling of brightness distribution over the asteroid disk for different scattering laws was carried out to determine the asteroid photocentre position. The photometric model of an asteroid which provides the arbitrary asteroid shape, albedo distribution on the surface and scattering law was used. It is shown that the displacement of photocentre relatively geometrical centre of the model depends essentially on the asteroid shape, phase angle and scattering law. Its value can reach 0.3-0.4 of asteroid angular radius. For the main-belt asteroids with angular sizes (0.1( the displacements can reach 0.02( and even more (up to 0.06(0.10( for the largest asteroids). For the NEAs similar values can be caused due to their large phase angles. Such values can exceed the accuracy of space-based astrometric measurements and of the modern ground-based ones. Therefore, taking them into account one can noticeably improve the accuracy of asteroid position determinations.
Lupishko Dmitrij F.
Shevchenko Vasilij G.
Tungalag N.
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