Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..512m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 512-520.
Astronomy and Astrophysics
Astronomy
9
Albedo, Asteroids, Astronomical Photometry, Light Curve, Planetary Structure, Correlation Coefficients, Fourier Analysis, Optical Reflection, Spherical Harmonics, Asteroids, Lightcurve, Astronomy, Albedo, Harmonics, Data Reduction, Analysis, Size, M Asteroids, Vesta, Dembrowska, Shape, Photometry, Calculations, Amplitude
Scientific paper
The distributions of reflected light from 28 large asteroids have been expanded as spherical harmonics series up to second degree. The resulting coefficients seem quite random with little correlation between them, except for tendencies to be expected for objects rotating about the axis of maximum moment of inertia. The first degree spherical harmonics, which essentially measure hemispherical albedo variegation, appear to have an increasing trend toward smaller objects. The most pronounced albedo variegation is found for asteroids of taxonomic class M, and for 4 Vesta and 349 Dembowska, both belonging to unusual taxonomic classes. Finally, the relative sizes of the different harmonics indicate that the first Fourier order components of randomly observed lightcurves are to a significant part due to the object shape, and not due purely to albedo variegation.
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