HD 2039 is a star with 1.23 times the mass of the Sun, and 1.19 times its radius. It is located 279.49 light years away from the solar system and is estimated to be 6 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
HD 2039 is known to have 1 exoplanets in orbit around it.
HD 2039 b was discovered by the Anglo-Australian Telescope observatory, in 2003-04, using the radial velocity method. Its semi-major axis is 2.20 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of HD 2039 b is 2000.220 times the mass of Earth. The radius of HD 2039 b is 12.700 that of Earth. At more than 50 Earth masses, HD 2039 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.