Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975spam.rept....5l&link_type=abstract
In ESRO Space Astrometry p 5-30 (SEE N75-30957 21-89)
Astronomy and Astrophysics
Astronomy
4
Astrometry, Celestial Reference Systems, Spacelab, Td Satellites, Conical Scanning, Photomultiplier Tubes, Reference Stars, Spaceborne Telescopes, Thermal Stability
Scientific paper
Two space astrometry projects are presented 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. Precision on the parallaxes can be obtained from two years of scanning, and a scan program of 40,000 stars could be envisaged. The second project utilizes 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.
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