Colour and Stereo Surface Imaging System - CaSSIS

Point Spread Function

RUAG's measurement of the PSF in the centre of the field. For comparison, our pixel size is 10 micron. Right at the edge of the field in the blue section of the detector, the PSF is a bit ratty but elsewhere ...

... it looks a lot like this.
The carbon-fibre structure of the telescope shrinks in space as it loses moisture. RUAG have computed this for us and defined where we have to put the active area of the detector.