Tags: Planet.
V391 Pegasi b also known as HS 2201+2610 b is an extrasolar planet orbiting the star V391 Pegasi approximately 4570 light-years away in the constellation of Pegasus. The planet was discovered by means of variable star timing which measured anomalies in variability of the star caused by a planet. It is the first planet to be detected with this method. It found to have mass of 3.2 times Jupiter semi-major axis of 1.7 AU and orbital period of 1170 days.
