Error analysis of full-field astrometry with a Schmidt telescope

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Astrometry, Error Analysis, Schmidt Telescopes, Astronomical Catalogs, Photographic Plates, Reference Stars

Scientific paper

Positional errors after a full-field plate solution were analyzed for plates taken by the 105-cm Kiso Schmidt telescope with an emphasis placed on the plate-constant error. From two sets of plates, one of which comprised nine plates for five consecutive nights, the mean random plate error was estimated to be 0.l2-0.15 arcsec. By regarding each one of the reference stars on a plate as being an object star, the error distribution for object stars could be simulated. The error for object stars is shown to sometimes be a few times larger than the standard deviation of the residuals for the reference stars, especially for star numbers of less than about 50; this phenomenon is suggested to be due to error propagation inherent in the least-squares procedure. This error amplification/attenuation mechanism could be explained using a simple numerical simulation. The amounts of other error components are discussed using ZZCAT catalog.

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