Space-based CCD experiment for high-precision astrometry

Details Space-based CCD experiment for high-precision astrometry Space-based CCD experiment for high-precision astrometry

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1945..505s&link_type=abstract

Proc. SPIE Vol. 1945, p. 505-511, Space Astronomical Telescopes and Instruments II, Pierre Y. Bely; James B. Breckinridge; Eds.

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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