Shutter Mapping Correction for Short CCD Exposures

Volume 28 number 2 (2000)

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Ronald E. Zissell

Abstract

Short exposures taken by CCD cameras with mechanical shutters can give field stars measurably different exposure times as a function of the position of the star in the field. For accurate photometry, the images need to be corrected for this error. The methods and formulas for correction are presented with an example of the significance of the correction.