Analysis of asteroid lightcurves. III. Albedo variegation.
Abstract
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 towards 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.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 March 1991
 Bibcode:
 1991A&A...243..512M
 Keywords:

 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;
 Astronomy; Asteroids;
 Minor Planets: Light Curves;
 Minor Planets: Albedo;
 Minor Planets: Photometry;
 Minor Planets: Figures