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7 February 2003 Anisoplanatism within the isoplanatic patch
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Measurements of anisoplanatism from data obtained with natural guide star adaptive optics on the Lick Observatory 3m are presented. These were obtained from short exposures of binary stars with the IRCAL camera whose field of view (~20”) is generally considered isoplanatic in the K-band. However, measurable amounts of high-order anisoplanatism were present at separations of ~7” and ~12” with an isoplanatic patch size estimated to be ~26”. Within this field, there was measureable differential image motion between the binary star components. This image motion was small compared to the size of the diffraction-spot and therefore had negligible effect.
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Julian C. Christou, E. Steinbring, Sandra M. Faber, Donald T. Gavel, Jennifer Patience, and Elinor L. Gates "Anisoplanatism within the isoplanatic patch", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003);

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