CHEOPS has one instrument: A photometer with a single CCD, operating between 0.4–1.05 µm, that is at the focal plane of an on-axis 33-cm diameter Ritchey-Chrétien telescope. The blue solar panels cover the back and sides of the instrument and will always face the Sun. The silver-looking tube on the left is the Baffle and Cover Assembly (BCA). The grey disc to the right of the silver tube is the telescope cover. The BCA is connected directly to the Optical Tube Assembly (OTA). The dimensions of the spacecraft are about 1.5m × 1.4m × 1.5m.