Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...294..274k&link_type=abstract
Astronomy and Astrophysics 294, 274-277 (1995)
Astronomy and Astrophysics
Astrophysics
8
Methods: Numerical, Minor Planets, Planets: Individual: 1620 Geographos
Scientific paper
Eight lightcurves of 1620 Geographos from the 1969, 1983 and 1993/94 apparitions were used to derive its physical parameters. The method used in the calculations involved the lightcurve amplitudes and moments of the maxima of brightness. Model amplitudes were calculated by integrating different scattering laws over the triaxial ellipsoid surface for the same viewing and illumination geometries as the real observations. It made it possible to avoid reductions of the observed amplitudes to zero solar phase angle - a correction often used in other methods - and to get more reliable estimation of the axis ratios. As a result, the sidereal period of rotation P_sid_=0.21763866d+/-10x10^-8^, ecliptic pole coordinates (λ_p_=54+/-6d, β_p_=-52+/-9d, B 1950.0) and a triaxial ellipsoid approximation of the shape (a/b=2.5+/-0.3, b/c=1.1+/-0.1) have been obtained (all uncertainties given here are estimated maximal errors). There is a second solution for the period, P_sid_'=0.21764381d+/-10x10^-8^, and though it is less probable, we have no sufficient grounds to reject it.
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