HD 100777 is a star with 0.83 times the mass of the Sun, and 1.04 times its radius. It is located 161.56 light years away from the solar system and is estimated to be 2 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
HD 100777 is known to have 1 exoplanets in orbit around it.
HD 100777 b was discovered by the La Silla Observatory observatory, in 2007-08, using the radial velocity method. Its semi-major axis is 1.03 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of HD 100777 b is 327.540 times the mass of Earth. The radius of HD 100777 b is 13.800 that of Earth. At more than 50 Earth masses, HD 100777 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.