The platform for CHEOPS is provided by EADS CASA Espacio based on the SEOSAT platform. This section briefly outlines the major platform requirements.
The CHEOPS mission is flying a single medium-size telescope (30 cm aperture, 1.2 length including baffle). All platform requirements are aimed at supporting the functionality of the telescope and its ultrahigh photometric precision. The main implications for the platform are related to pointing capabilities and thermal environment for the payload.
The telescope will be mounted on a stiff optical bench which defines the interface to the platform. It shall be thermally decoupled. A sun shield mounted on the platform protects the radiator and detector housing against the sun and also contains solar panels for the energy and power subsystem. The satellite has dimensions of approx. 1.5 x 1.5 x 1.5 m and a hexagonal base structure. The sun-shield wraps around the hexagon, see the following figure.