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Astrometric performance of the Schmidt telescope at the Xuyi station of the Purple Mountain Observatory

Published online by Cambridge University Press:  01 October 2007

Y. Yu
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: yuy@shao.ac.cn
Z. H. Tang
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: yuy@shao.ac.cn
Z. X. Qi
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China email: yuy@shao.ac.cn Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
J. F. Wu
Affiliation:
Surveying and Mapping Institute, Zhengzhou 450052, China
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Abstract

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On January 26, 2006, an area of the sky of 80 deg2 at α = 9h, δ= 20o (J2000.0) was observed with the 100/120cm Schmidt telescope at the Xuyi station of the Purple Mountain Observatory. Astrometric performance of the telescope is analyzed by this group of CCD observations. The results show that: (1) the CCD images suffer from complicated distortions, and a third order plate model is recommended for reductions; (2) there is no obvious magnitude equation for objects brighter than 16.5 mag, and (3) for this group of CCD images, the astrometric precision for objects brighter than 16.5 mag is better than 70 mas per coordinate when reduced against the UCAC2 catalog.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Zacharias, N., et al. 2004, AJ, 127, 3043CrossRefGoogle Scholar