Abstract
ABSTRACT Polynomial adjustments for the reduction of plates taken with the astrograph at the Observatorio de Campinas, Sao Paulo, Brazil, were investigated. A statistical analysis was performed on the vectorial residual maps derived from the reductions of 11 photographic plates. The results have shown the 2nd degree model to be inadequate for the reductions. A radial distortion effect in the 7 degree X 7 degree field was detected. The 5th degree radial distortion term was found to be not significant. The 2nd degree plus a term of radial distortion of the 3rd degree and the 3rd degree polynomial models give residuals of the order of 0".30, compatible with the errors of the catalogues used (Perth 70 and PPM South, preliminary version). However there are evidences that the last model gives slightly better results than the former.
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