A CCD system for reading circles in wide-angle astrometry

Details A CCD system for reading circles in wide-angle astrometry A CCD system for reading circles in wide-angle astrometry

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.2311s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, June 1991, p. 2311-2316.

Astronomy and Astrophysics

Astronomy

4

Astrometry, Charge Coupled Devices, Wide Angle Lenses, Image Analysis, Telescopes, Television Cameras

Scientific paper

This paper describes a CCD circle reading system developed for the USNO (Flagstaff) transit telescope. Circle readings are needed for the determination of declinations in wide-angle astrometry. The detectors are commercially available Philips CCD-TV imaging cameras, which can produce digital images every 1/15th of a second. The positions of division marks on the circle are determined by fitting a function to their profiles. This reading system is very accurate (+ or - 0.007 arcsec), fast, and extremely reliable. Also, since the digital output is two-dimensional, the radial positions of division marks on a circle can also be determined, but with lower accuracy (+ or - 1.2 microns).

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