 Like the majority of known extrasolar planets , <unk> <unk> b was detected by the variations in its star 's radial velocity caused by the planet 's gravity . The variations were detected by making sensitive measurements of the <unk> shift of <unk> <unk> 's spectrum . The planet 's existence was announced in January 1997 , together with 55 <unk> b and the planet orbiting <unk> <unk> . 
