An optical distortion solution for the Keck I OSIRIS Imager

Matthew S. R. Freeman; Jessica R. Lu; Jim Lyke; Jacques Delorme; Emily Ramey; Grace Jung; Sylvain Cetre; Scott Lilley; Paul Richards; Ed Wetherell; Avinash Surendran; Anna Coerver; Peter Wizinowich

doi:10.1117/12.2630712

29 August 2022 An optical distortion solution for the Keck I OSIRIS Imager

Matthew S. R. Freeman, Jessica R. Lu, Jim Lyke, Jacques Delorme, Emily Ramey, Grace Jung, Sylvain Cetre, Scott Lilley, Paul Richards, Ed Wetherell, Avinash Surendran, Anna Coerver, Peter Wizinowich

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121853R (2022) https://doi.org/10.1117/12.2630712
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We calculate an optical distortion solution for the OSIRIS Imager on the Keck I telescope, by matching observations of globular clusters to a Hubble reference catalogue. This solution can be applied to correct astrometric distortions in OSIRIS frames, improving the astrometric accuracy of observations. We model the distortion with a 5th order Legendre polynomial. The distortion we find matches the expected OSIRIS distortion, and has a fit error of 0.6 mas, but has large residuals of 7 mas. We are currently iterating on an improved reference frame to improve the residual. Additionally, we have installed the Precision Calibration Unit (PCU) on the Keck I optical bench, which will generates an artificial grid of stars for use in future distortion calculations.

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Matthew S. R. Freeman, Jessica R. Lu, Jim Lyke, Jacques Delorme, Emily Ramey, Grace Jung, Sylvain Cetre, Scott Lilley, Paul Richards, Ed Wetherell, Avinash Surendran, Anna Coerver, and Peter Wizinowich "An optical distortion solution for the Keck I OSIRIS Imager", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121853R (29 August 2022); https://doi.org/10.1117/12.2630712

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