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Proceedings Paper

Problems with twilight/supersky flat-field for wide-field robotic telescopes and the solution
Author(s): Peng Wei; Zhaohui Shang; Bin Ma; Cheng Zhao; Yi Hu; Qiang Liu
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Paper 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.

Paper Details

Date Published: 6 August 2014
PDF: 7 pages
Proc. SPIE 9149, Observatory Operations: Strategies, Processes, and Systems V, 91492H (6 August 2014); doi: 10.1117/12.2055459
Show Author Affiliations
Peng Wei, National Astronomical Observatories (China)
Zhaohui Shang, Tianjin Normal Univ. (China)
National Astronomical Observatories (China)
Bin Ma, National Astronomical Observatories (China)
Cheng Zhao, Tsinghua Univ. (China)
Yi Hu, National Astronomical Observatories (China)
Qiang Liu, National Astronomical Observatories (China)

Published in SPIE Proceedings Vol. 9149:
Observatory Operations: Strategies, Processes, and Systems V
Alison B. Peck; Chris R. Benn; Robert L. Seaman, Editor(s)

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