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Accurate determination of the plate model based on CCD images with different orientations

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  • Astrometry
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Chinese Science Bulletin


The images of the open cluster NGC2168 are taken using the newly-fitted 2k×2k CCD attached to the 1-m telescope at the Yunnan Observatory with two different orientations. After the catalogue position of a star from UCAC2 is compared with its corresponding measured position, a surprising result shows that a small field of view (about 7’×7’) exhibits an obvious distortion. Specifically, the polynomial between the standard coordinate (ξ,η) and its corresponding measured one (x,y) for a star in each field of view has significant terms as high as 4th order. Accordingly, the positional measurement accuracy of a bright UCAC2 star can be derived as well as ˜7 mas in each direction (60 s of exposure time and near the zenith). This new finding would be important for a CCD image to deliver a highly accurate position in its whole field of view.

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Correspondence to QingYu Peng.

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This work was supported by the National Natural Science Foundation of China and the Astronomical Joint Fund under the Chinese Academy of Sciences (Grant Nos. 10573008, 10778617, 10973007).

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Peng, Q., Fan, L. Accurate determination of the plate model based on CCD images with different orientations. Chin. Sci. Bull. 55, 791–796 (2010).

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