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Testing Schmidt Plates for Astrometric Purposes

Published online by Cambridge University Press:  04 August 2017

J. L. Russell  and
C. A. Williams
J. L. Russell
Affiliation:
Space Telescope Sci. Inst., 3700 San Martin Drive, Homewood Campus Baltimore, MD 21218
C. A. Williams
Affiliation:
Dept. of Mathematics, Univ. of South Florida, Tampa, FL 33620

Abstract

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The Guide Star Selection System for the Space Telescope is being developed to find positions (± 0.25 arcsec) and magnitudes (± 0.4 mag) for guide star pairs for every possible ST target. The data available for the astrometric portion of this task are measurements (±1 μm) of plate surveys from the Palomar and UK schmidt telescopes and positional data from the AGK3 and the SAOC. Astrometric testing to date has concentrated on whole plate reductions in the area of the astrometric standard region in Praesepe. Described here are the test procedures derived to measure the effect of the astrometric accuracy of the guide star positions on ST pointing success. The most critical item in the pointing procedure is that the separations of the guide stars and the target over the ST field of view (28 arcmin diameter) be well-known. Any small zero-point shift or rotation of the field relative to the absolute system is tolerable.

Type
III. Photographic Astrometry
Information
Symposium - International Astronomical Union , Volume 109: Astrometric Techniques , 1986 , pp. 259 - 270
Copyright
Copyright © Reidel 1986 

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