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J. R. Pier, J. A. Munn, R. B. Hindsley, G. S. Hennessy (USNO), S. M. Kent (FNAL), SDSS Collaboration
Astrometric residuals from engineering scans with the SDSS 2.5M telescope and imaging camera show quasi-periodic behavior with typical periods of from a few to 20 minutes and semi-amplitudes of from 0.05 to over 0.20 arcsec. Such behavior has been seen before in a number of studies and has been attributed to atmospheric phenomena termed ``anomalous refraction." The unique design of the Sloan camera reveals, for the first time, that anomalous refraction is spatially coherent on scales exceeding two degrees.
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