Determination of the pole orientation of an asteroid - The amplitude-aspect relation revisited

Details Determination of the pole orientation of an asteroid - The amplitude-aspect relation revisited Determination of the pole orientation of an asteroid - The amplitude-aspect relation revisited

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..186p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 186-194.

Astronomy and Astrophysics

Astronomy

10

Asteroids, Astrometry, Correlation, Ellipsoids, Light Curve, Occultation, Poles, Asteroids, Amplitude, Optical Properties, Astronomy, Observations, Nysa, Lightcurve, Calculations, Procedure, Photometry, Occultations, Hektor

Scientific paper

Near the opposition of a minor planet the geometrical approximation essentially constitutes a good representation of the Hapke-Irvine relation for describing the scattering properties of a surface layer, and the authors show that the normalized light curve of a three-axes ellipsoid model reduces to a straight line whose slope depends only on the aspect angle A and on the semi-axes ratios a/b, b/c of the ellipsoid. A set of non-linear equations is then solved by a least squares method in order to derive the four unknown parameters λ0, β0 (ecliptic coordinates of the pole) and a/b, b/c. The authors have applied this technique to published observations of two asteroids: For (624) Hektor two possible solutions are found; and for the case of (44) Nysa, they show that additional observations are needed in order to derive a self-consistent pole orientation.

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