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- W4298266456 abstract "This paper is the first of a series of papers in which we will apply the methods we have developed for high-precision astrometry (and photometry) with the Hubble Space Telescope (HST) to the case of wide-field ground-based images. In particular, we adapt the software originally developed for WFPC2 to ground-based, wide field images from the WFI at the ESO 2.2 m telescope. In this paper, we describe in details the new software, we characterize the WFI geometric distortion, discuss the adopted local transformation approach for proper-motion measurements, and apply the new technique to two-epoch archive data of the two closest Galactic globular clusters: NGC 6121 (M 4) and NGC 6397. The results of this exercise are more than encouraging. We find that we can achieve a precision of ~7 mas (in each coordinate) in a single exposure for a well-exposed star, which allows a very good cluster-field separation in both M 4, and NGC 6397, with a temporal baseline of only 2.8, and 3.1 years, respectively." @default.
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- W4298266456 date "2006-07-17" @default.
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- W4298266456 title "Ground-based CCD astrometry with wide field imagers" @default.
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- W4298266456 doi "https://doi.org/10.1051/0004-6361:20065004" @default.
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