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Tycho Photometry: Calibration and First Results

Published online by Cambridge University Press:  12 April 2016

V. Großmann
V. Großmann*
Affiliation:
Astronomisches Institut der Universität Tübingen, Germany

Abstract

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The star mappers on board the ESA Hipparcos satellite will be used as one part of the Tycho project to obtain photometric data of a quasi B and V band magnitude for the 500,000 brightest stars and one broad-band magnitude T for a further 500,000 stars. Approximately 150 million single observations of these stars will be collected during a 4.5-year mission of the satellite.

The accuracy of the photometric data gained is expected to be 0.03 mag on the average at B = 10.5 mag for non-variable stars. We shall get T magnitudes for stars down to a limiting magnitude of about B = 12 mag depending on the galactic latitude. We will give an overview of the calibration procedure and present some of the first results.

Type
Session 7 Photometry from Space
Information
International Astronomical Union Colloquium , Volume 136: Stellar Photometry – Current Techniques and Future Developments , 1993 , pp. 346 - 351
Copyright
Copyright © C.J. Butler and I. Elliottt 1993

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