DES Observational Technique


Moving objects are detected by an automated algorithm followed by visual inspection of the data. By limiting ourselves to two exposures per field, we maximize our sky coverage per night. However, this approach limits the efficiency of a purely automated detection strategy. We overcome this problem through a highly efficient system of direct inspection in which motion is manifested in terms of color.

In particular, the first exposure of a given field is projected in the red plane of a 24-bit color monitor and the second is, after registration, projected in the blue and green frames. Accordingly, stationary objects appear as white while moving objects appear as red/cyan pairs of images (see Figure Y).

Figure Y: Moving objects appear as
red/cyan pairs; stationary objects
appear white.


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