Publications of the MPIfR
Optical & Infrared
Interferometry Group
D. Schertl, F. Grieger, K.-H. Hofmann,
W. Mauder, T. Reinheimer, H. Weghorn, and G. Weigelt
High-resolution Speckle Masking Observations of
Ceres and Vesta
Planetary Space and Science, v.43, p.313-320 (1995)
Abstract
We present high-resolution speckle masking observations of the
asteroids Ceres and Vesta and a detailed description of the image
processing methods applied. The edges of the asteroid disks are
reconstructed with high signal-to-noise ratio. On the surface of Ceres
very weak surface features are visible. The Vesta image shows
high-contrast features. At the time of the observations, Ceres had an
apparent angular diameter of 0.74 arcsec (905 km) and Vesta 0.45 arcsec
× 0.44 arcsec (539 km × 519 km). For the reconstruction of the asteroid
images it was necessary to develop a new method for the compensation of
the four-dimensional photon bias in the average bispectrum of the
speckle interferograms. The dependence of the reconstruction on the
photon bias compensation and on the compensation of the speckle
interferometry transfer function is investigated to study the
robustness of the method.
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