We investigate methods of generating image subtraction templates that are suitable for slow-moving object searches with data from NASA’s TESS mission. We develop a novel “donut” template that is well suited to Centaurs and trans-Neptunian objects; compared to a template constructed from the median of all images, a donut template substantially increases the detectability of these objects for rates of motion <2″ hr −1 . This cleaning method brings the background noise level down to <1 electron per second, revealing both slow-moving trans-Neptunian objects as well as diffuse comet tails. This cleaning method is also well suited for preparing images for shift-and-stack processing.
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Alexandersen et al. (2026) studied this question.
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