Proton-induced changes in CTE for n-channel CCDs and the effect on star tracker performance

Proton-induced changes in charge transfer efficiency of two CCD types with differing pixel sizes have been characterized in detail and compared with measurements of the shift in position of artificial star images to determine the impact on star tracker performance. Errors in star position are large at low backgrounds but can be limited to less than 0.1 pixels for 10 krd(Si) proton environments (e.g., 15 years GEO) if the background is high and windowed readout is used.