Mirrors

There were some serious problems with the mirror control system which support and shape the mirror. This adaptive optics system consists of 45 bellows which are controlled through a pneumatic system. When checking the individual bellows, it was found that in 2 of them the pressure regulators had failed. The regulators were replaced, after which things worked properly again.

The main mirror was washed again during the semester, and the photometric zero points measured with ALFOSC were found to be close to the ``fresh aluminium´´ measured after the aluminisation in summer 2014.