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A Ritchey-Chrétien telescope (RCT or RC) is a type of reflector telescope that has a specific reflector configuration of two hyperbolic mirrors, designed to limit telescope-induced aberrations. The primary mirror is hyperbolic but very close to parabolic. The secondary mirror is convex and hyperbolic. Curvature is chosen to eliminate third-order coma (the cubed term of a series-expansion that describes the aberration). The design is common for large telescopes, including: