HD 217107 c

HD 217107 c is a Jupiter-like extrasolar planet orbiting the star HD 217107 about every eight years. It is the second planet to be discovered orbiting the star, after HD 217107 b which orbits the star in a much smaller orbit. HD 217107 c's existence was hypothesised in 2002 and confirmed in 2005, when radial velocity studies of the star indicated another, more distant and massive companion orbiting the star. Its mass and orbital parameters remain highly uncertain.