Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.177..147l&link_type=abstract
In ESA The Sci. Aspects of the Hipparcos Space Astrometry Mission p 147-152 (SEE N82-30146 20-88)
Astronomy and Astrophysics
Astronomy
5
Astrometry, Binary Stars, Esa Satellites, Image Reconstruction, Satellite Observation, Spaceborne Telescopes, Angular Resolution, Focal Plane Devices, Fourier Transformation, Phase Switching Interferometers, Sidelobe Reduction, Signal To Noise Ratios
Scientific paper
Image reconstruction from Hipparcos scans is discussed. Although the Hipparcos telescope is designed as a conventional optical imaging device, its combination with a modulating grid in the focal plane means that the whole instrument can be considered as a phase interferometer. Image reconstruction can exploit digital image processing techniques. Brightness distribution, for example, can be reconstructed using radio interferometry approaches to aperture synthesis. The possibility of detecting faint companions depends on the signal to noise ratio of the map obtained from the inverse transformations of sample points collected during the missions. Many binaries with separations in the interval from 0.05 to 0.5 arcsec could be discovered by Hipparcos.
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