The Flat Sky: Calibration and Background Uniformity in Wide Field Astronomical Images
- 1 October 1996
- journal article
- research article
- Published by IOP Publishing in Publications of the Astronomical Society of the Pacific
- Vol. 108 (728) , 944
- https://doi.org/10.1086/133817
Abstract
Gradients in the surface brightness of the twilight and night sky require careful consideration both in the flat-field calibration and in the subsequent reduction of images that cover a large angular field. We present observations of BVRI surface brightness gradients in the twilight sky, and discuss some strategies for the treatment of gradients in the moonlit and dark sky.Keywords
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