HD 39091 is a star with 1.09 times the mass of the Sun, and 1.1 times its radius. It is located 59.59 light years away from the solar system and is estimated to be 2.98 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
HD 39091 is known to have 2 exoplanets in orbit around it.
HD 39091 b was discovered by the Anglo-Australian Telescope observatory, in 2002-07, using the radial velocity method. Its semi-major axis is 3.10 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of HD 39091 b is 4102.200 times the mass of Earth. The radius of HD 39091 b is 12.300 that of Earth. At more than 50 Earth masses, HD 39091 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.
HD 39091 c was discovered by the Transiting Exoplanet Survey Satellite (TESS) observatory, in 2018-11, using the transit method. Its semi-major axis is 0.07 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of HD 39091 c is 4.824 times the mass of Earth. The radius of HD 39091 c is 2.042 that of Earth. With a mass below 5 Earth masses, a density of 2.97, and a semi-major axis of 0.06839 astronomical units, HD 39091 c could, potentially, be an ocean world - a planet with no dry land.