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Focal plane design for ESA's Eddington planet-finding mission

The ESA Eddington mission is designed to perform the dual science tasks of asteroseismology and exo-planet finding. The ambitious science goals can be met by a single instrument that utilises high precision and long duration photometry, that in the planet-finding phase leads the ability to detect planetary transits from targets in the magnitude range 11 - 15. We describe the baseline design of the Eddington focal plane cameras, including the performance features of e2V CCD42-C0 devices that are the proto-type detectors. Important trade-offs and system constraints are noted and issues that affect the scientific output such as radiation damage and calibration aspects, and are briefly reviewed.