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Re-calibration of GSC2.3 with UCAC2

Published online by Cambridge University Press:  01 October 2007

Z. H. Tang ,
Z. X. Qi ,
Y. Yu ,
R. L. Smart ,
B. Bucciarelli ,
M. G. Lattanzi  and
A. Spagna
Z. H. Tang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: [email protected]
Z. X. Qi
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: [email protected] Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
Y. Yu
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: [email protected]
R. L. Smart
Affiliation:
INAF-Astronomical Observatory of Turin, Pino-Torinese 2010025, Italy
B. Bucciarelli
Affiliation:
INAF-Astronomical Observatory of Turin, Pino-Torinese 2010025, Italy
M. G. Lattanzi
Affiliation:
INAF-Astronomical Observatory of Turin, Pino-Torinese 2010025, Italy
A. Spagna
Affiliation:
INAF-Astronomical Observatory of Turin, Pino-Torinese 2010025, Italy
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Abstract

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To make GSC-II more accurate and useful, it is necessary to re-calibrate GSC-II when a better reference catalogue (UCAC2) is available. With UCAC2 as the reference, preliminary re-calibration of some sample plates from GSC2.3 were carried out with different methods, such as Global, Mask and Filter. The results indicate that a 7th-order polynomial is sufficient to account for the influence of Schmidt plate deformation on the measured coordinates of stars. The magnitude equation can be eliminated after correcting for a common magnitude equation. The RMS of the re-calibrated data is around ±0.2~0.3 arcsec.

Keywords

astrometrycatalogssurveys
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 334 - 336
Copyright
Copyright © International Astronomical Union 2008

References

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Bucciarelli, B., et al. 2008, this volume, p. 316Google Scholar