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Proceedings Paper

Space-based CCD experiment for high-precision astrometry
Author(s): Stuart B. Shaklan; Steven H. Pravdo
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Paper Abstract

The Astrometric Imaging Telescope, an orbiting 1.5 m low-distortion Ritchey-Chretien, will use a large format CCD to record star trails as the CCD is dragged across the image plane. Star-trail separations, when averaged over thousands of pixels, yield photon-noise limited centroids with 10 micro-arcsecond accuracy. In this paper, we will discuss the important CCD and optical design parameters that affect astrometric accuracy. For the CCD, these include charge transfer efficiency, pixel-to-pixel relative quantum efficiency, sub-pixel QE gradients, and systematic pixel dislocations. For optical design, they are tolerancing to parameters such as secondary mirror decenter and tilt, and conic constants. We present a point design for a system that can achieve 10 micro-arcsecond accuracy over a long-term mission. End-to-end modeling, including high precision diffraction calculations, is used to validate the design.

Paper Details

Date Published: 1 November 1993
PDF: 7 pages
Proc. SPIE 1945, Space Astronomical Telescopes and Instruments II, (1 November 1993); doi: 10.1117/12.158799
Show Author Affiliations
Stuart B. Shaklan, Jet Propulsion Lab. (United States)
Steven H. Pravdo, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 1945:
Space Astronomical Telescopes and Instruments II
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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