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Some Problems of Wide-Field Astrometry by a Short-Focus CCD-Astrograph

Published online by Cambridge University Press:  07 August 2017

I. S. Guseva
I. S. Guseva*
Affiliation:
Pulkovo Observatory

Abstract

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The worldwide application of CCDs in astronomy is concerned mainly with the problems of photometry and spectrophotometry. Astrometry with CCDs is limited by the small fields of view and now is used to solve some special tasks such as parallax determination of faint stars, observations of QSOs, etc. Very interesting results were obtained using a CCD with a meridian circle in a drift scanning mode to solve the problem of the extension of the reference system to stars of 16th–17th mag and the linkage between radio and optical reference frames (Stone 1994).

Based on the preliminary results of our observations, some proposals on astrometry with CCDs are discussed in the paper. The aim is to show the use of short-focus telescopes with CCDs in the mode of traditional astrographs. Numerous tasks may be solved with such instruments more simply and correctly than with meridian instruments in a drift scanning mode.

The problems of the application of CCDs with short-focus optics are also discussed. Some effects of CCD properties on the accuracy of astrometric and photometric measurements are also considered.

Type
Section I — Review Papers
Information
Symposium - International Astronomical Union , Volume 167: New Developments in Array Technology and Applications , 1995 , pp. 275 - 283
Copyright
Copyright © Kluwer 1995 

References

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