V0391 Peg is a star with 0.5 times the mass of the Sun, and 0.23 times its radius. It is located 3900.76 light years away from the solar system and is estimated to be 10 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
V0391 Peg is known to have 1 exoplanets in orbit around it.
V0391 Peg b was discovered by the Multiple Observatories observatory, in 2007-09, using the pulsation timing variations method. Its semi-major axis is 1.70 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of V0391 Peg b is 1017.600 times the mass of Earth. The radius of V0391 Peg b is 13.100 that of Earth. At more than 50 Earth masses, V0391 Peg b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn in our solar system.