Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ispg.proc.....f&link_type=abstract
International Society for Photogrammetry, International Congress for Photogrammetry, 13th, Helsinki, Finland, July 11-23, 1976,
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Calibrating, Cameras, Photographic Plates, Astronomical Catalogs, Astronomical Coordinates, Data Reduction, Photogrammetry
Scientific paper
A series of field and data reduction procedures have been developed to obtain highly accurate camera calibration constants for metric reseau cameras from time exposures of the star field. The calibration techniques include combined data from several two-and-one-half hour chopped and precisely timed exposures. Each exposure is made with the camera rigidly mounted and oriented to a different direction about the zenith. The double measurement of up to 2400 catalogued star images evenly spaced throughout the format of each plate provides sufficient redundancy to determine accurately the systematic deviations of all rays in the format from a central perspective. Special provisions have been included in the data reduction processes to minimize the influence of measurement errors, atmospheric refraction anomalies, thermal variations, and random variations in plate flatness.
Fritz L. W.
Slama C. C.
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