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Tycho Astrometry and Photometry

Published online by Cambridge University Press:  04 August 2017

E. Høg
E. Høg*
Affiliation:
Copenhagen University Observatory

Abstract

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The HIPPARCOS Star Mappers were designed to determine the satellite attitude by observation of stars with known positions. ESA has now enhanced them so that the continuous photon counts from two photo multipliers with B and V response will be recorded. The records will be used to derive an astrometric and photometric catalogue, the TYCHO Catalogue, complete to about B=11 mag and thus containing about 500 000 stars. The positions, annual proper motions and parallaxes will have an accuracy of about 0.03 arcsec and the magnitudes one of 0.03 mag.

The instrument is described and some aspects of the data reduction are discussed, namely the evaluation of a photon record by means of numerical filters, and the use of a TYCHO Input Catalogue.

Type
VII. Space Astronomy
Information
Symposium - International Astronomical Union , Volume 109: Astrometric Techniques , 1986 , pp. 625 - 635
Copyright
Copyright © Reidel 1986 

References

Høg, E., Jaschek, C., and Lindegren, L.: 1982, Proceedings of an International Coll. at Strasbourg, ESA SP-177, pp. 21 Google Scholar
Kovalevsky, J.: This Volume Google Scholar
Russell, J.: 1986, On the Guide Star Catalogue, This Volume Google Scholar