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|Title:||Diffracto-astrometry measurements: Accuracy of the measuring algorithm|
|Abstract:||We present a theoretical analysis of the Diffracto-Astrometry measuring algorithm. We generated Tiny-Tim Theoretical Point Spread Functions (PSFs) for the CCDs in the HST Wide Field Planetary Camera 2 (WFPC2). These images were then measured using only their diffraction pattern, and positions for the simulated PSFs were obtained. The measuring algorithm recovers the original positions reasonably well (+/-0.1 to +/-0.4 pixels). However, slight deviations from the original values are observed. We adjust the differences between the real and the measured position with a quadratic function of the coordinates. Application of these transformations allows determination of the position of a stellar image within a few hundredths of a pixel.|
|Appears in Collections:||Producción científica UdeG|
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