The optical camera (OCAM) is based on the OMC on INTEGRAL [83], although the qualification level will be less demanding than ESA requirements, particularly regarding the CCD. A class 0 CCD detector of 1024 x 2048 pixels will be used in frame transfer mode in order to avoid the use of a mechanical shutter. Therefore the available area for performing optical observations (in the V band) is 1024 x 1024 pixels. OCAM will provide a FOV of 2 degrees with a 7"/pixel angular resolution. The sensitivity is V = 14.5 for 1-s exposures, and V = 18.5-20.0 for 10 x 100-s [84].
For every observation, a set of guide stars (about 3) in the FOV will be selected. A region of 0.2 degrees around the star (68 x 68 pixels) will be stored in memory every 10 s, in order to check the Minisat pointing. A full frame will be stored every hour, in order to perform studies of variability.