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Re-calibration of GSC2.3 with UCAC2

Published online by Cambridge University Press:  01 October 2007

Z. H. Tang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: zhtang@shao.ac.cn
Z. X. Qi
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: zhtang@shao.ac.cn 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: zhtang@shao.ac.cn
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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

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