Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974rst.....6..253l&link_type=abstract
Revue Scientifique et Technique CECLES/CERS, vol. 6, Oct.-Dec. 1974, p. 253-265. In French.
Astronomy and Astrophysics
Astronomy
1
Astrometry, Optical Scanners, Reference Stars, Spaceborne Astronomy, Spacelab, Automatic Control, Conical Scanning, Electrophotometry, Random Errors, Spaceborne Telescopes, Temperature Control, X Ray Sources
Scientific paper
This article presents two space-astrometry projects which are specially designed for obtaining a very precise, coherent and complete stellar reference system. Both projects are based on a reference angle given by a complex mirror and on the accurate photoelectric measurement of relative positions in a telescope field while stars are scanned on a grid. The first project utilizes a Spacelab-borne 40 cm-diameter telescope which give positions of 0.001 arcsec up to magnitude 13 and 0.005 arcsec up to magnitude 16. The same precision on the parallaxes can be obtained from two years of scanning, and a scan programme of 40,000 stars could be envisaged. The second project utilises a simpler guidance device, and could be flown on board a free-flyer similar to the TD-1 satellite. The automatic sky scanning will enable the positions of 300,000 stars up to magnitude 11 to be determined with random errors in positions and parallaxes of about 0.001 arsec for bright stars, and less than 0.003 arcsec for stars up to magnitude 10.
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