Drift Scanning from Ground and in Space |
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Authors: | M Gai MD Guarnieri MG Lattanzi |
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Institution: | (1) Osservatorio Astronomico di Torino, Str. Osservatorio, 20, I-10025 Pino T.se (TO);(2) European Southern Observatory, Chile;(3) Osservatorio Astronomico di Torino, Italy |
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Abstract: | The drift scanning technique offers, in principle, a simple and efficientmethod for imaging wide regions of the sky with intrinsic high astrometricaccuracy. Its performance is analyzed in two distinct environments, namelyfrom a small class ground based telescope and a spaceborne interferometer. Inparticular, the study is referred to the proposed ESA cornerstone missionGAIA (Global Astrometric Interferometer for Astrophysics).The constant clock rate of a CCD, due to the declination dependentsidereal speed variation, results in a systematic image smearing, whichlimits the positional accuracy. Moreover, the readout timing accuracyprovides an additional random noise corresponding to a drift speed jitter.Stability requirements on the order of 10-6 or better have to be fulfilledfor the space option.Both effects can be addressed by proper system design; provisionalimplementation strategies are discussed for both applications. |
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