Either type of detector should be capable of measuring positions to a few tenths of a pixel (which will be well below 1" in most cases) with basic centroiding and a good solution to a good reference catalog.? Of course that depends on how much time the measurer devoted to the task, but CCD vs CMOS makes no difference at this level.? We achieved accuracy down to 1-2% of a pixel on the Dark Energy Camera, and this has been done by other CCD survey cameras, but I don't know if that has been achieved yet with CMOS devices.?
