AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 44. Computation and Data Analysis
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[44.05] Anomalous Refraction Studies with the SDSS

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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