Do we Need to Model Plates at All?

Details Do we Need to Model Plates at All? Do we Need to Model Plates at All?

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.296...66m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 296, Issue 1, pp. 66-76.

Astronomy and Astrophysics

Astronomy

4

Methods: Data Analysis, Methods: Statistical, Catalogues, Surveys, Astrometry

Scientific paper

The historical method of obtaining equatorial coordinates for stars observed via astronomical photography has been to convert the measured coordinates to equatorial coordinates with the aid of a plate model which corrects for a variety of effects. However, we now have at our disposal novel smoothing techniques, of considerable generality, which in conjunction with modern star catalogues can reproduce the essence of the plate model while dramatically minimizing both the fortuitous and systematic errors of observation. In this paper we demonstrate that, with this technique and extant catalogues, one can obtain, with at least the same precision and better accuracy, the information necessary to transform the measured coordinates successfully into standard coordinates by a process that involves no sophisticated model for the plate. Using external checks we estimate the increase in accuracy to be of the order of 25 per cent.

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