Computer Science – Performance
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993acasn..34..173m&link_type=abstract
Acta Astronomica Sinica (ISSN 0001-5245), vol. 34, no. 2, p. 180-188
Computer Science
Performance
Accuracy, Astrometry, Lenses, Optical Measurement, Performance Tests, Telescopes, Image Analysis, Microdensitometers, Photographic Plates, Pleiades Cluster
Scientific paper
We have carried out an astrometric test of the 1.56m reflector with a spherical 2-lens corrector of Shanghai Observatory. Three plates of the Pleiades region were taken and the images were measured with a PDS microdensitometer. Referring to the positions given in Eichhorn's catalog as standards and using a cubic reductions formula, we find the positions within +/- 11 min of the center are determined with an accuracy of 0.015 sec, within +/- 18 min, an accuracy of 0.02 sec, and within +/-23 min, an accuracy of 0.03 sec. In addition, the coefficient of the coma term in the plate constants is found to be on the order of 10-5 to 10-6, and that of the distortion term, on the order of 10-9 to 10-10. These figures indicate that the 1.56m Astrometric Telescope with a spherical 2-lens corrector is very well fitted to undertake astrometric work of faint objects.
Chen Jin
Jiang Pei-Fang
Mao Ya-Qing
Zhuang Xue-Juan
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