Correcting the distortion of images taken with the ultraviolet imaging telescope

Details Correcting the distortion of images taken with the ultraviolet imaging telescope Correcting the distortion of images taken with the ultraviolet imaging telescope

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106.1151g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 705, p. 1151-1156

Astronomy and Astrophysics

Astronomy

11

Computer Aided Mapping, Distortion, Geometric Rectification (Imagery), Image Analysis, Ultraviolet Photometry, Ultraviolet Telescopes, Astro Missions (Sts), Geometric Accuracy, Mathematical Models, Spaceborne Telescopes

Scientific paper

The Ultraviolet Imaging Telescope (UIT) cameras include two-stage magnetically focused image intensifiers that introduce small but significant geometrical distortions into the data. These distortions, which create positional offsets as large as 25 arcsec at the field edges, are corrected by the procedure described here to 2-3 arcsec, approximately the resolution of the images. The distortion is measured by comparing and correcting UIT images to digitized Guidestar survey plates of the same fields. Two-dimensional third-order polynomials are used to model the distortion. The models assume that the distortion is an instrumental effect, independent of mission elapsed time and target, and that the effect of distortion is an instrumental effect, independent of mission elapsed time and target, and that the effect of distortion in the center of each field is minimal. The models are used to improve computed astrometric plate solutions and to remove the geometric distortion while transforming the image to a standard north-up, ease-left orientation.

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