Active guiding with differential pointing model

Active guiding with differential pointing model

NGC 891 on 20 min exposure, left with dPM, right without

17-10-2010

Active guiding with the piggy-back telescope now includes a differential pointing model.

Guiding with a piggy-back telescope not only produces an offset between main and auxiliary telescope, it also means that this offset varies with elevation of the target. We now measured that variation and included it into the guiding algorithm. To the left, a 20min exposure of NGC 891 with guiding enabled can be seen, to the right an image of the same object just half an hour later without active guiding is shown. RoboTel at the institute campus was used as a testbed here.