First detection of an exoplanet orbiting two stars at once with radial velocity

Exoplanet Kepler-16 (AB) b orbits a binary star 245 light years from the Sun. It is the first such exoplanet detected with radial velocity method, which measures gravitational influence of the planet on its star.

The exoplanet has one third of Jupiter's mass and 75 % of its size. One year on this world lasts 228 days.