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- W2012646426 abstract "Twilight/night sky images are often used for flat-fielding CCD images, but the brightness gradient in twilight/ night sky causes problems of accurate flat-field correction in astronomical images for wide-field telescopes. Using data from the Antarctic Survey Telescope (AST3), we found that when the sky brightness gradient is minimum and stable, there is still a gradient of 1% across AST3’s field-of-view of 4.3 square degrees. We tested various approaches to remove the varying gradients in individual flat-field images. Our final optimal method can reduce the spatially dependent errors caused by the gradient to the negligible level. We also suggest a guideline of flat-fielding using twilight/night sky images for wide-field robotic autonomous telescopes." @default.
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- W2012646426 date "2014-08-06" @default.
- W2012646426 modified "2023-09-23" @default.
- W2012646426 title "Problems with twilight/supersky flat-field for wide-field robotic telescopes and the solution" @default.
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- W2012646426 doi "https://doi.org/10.1117/12.2055459" @default.
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