4 UMa is a star with 1.23 times the mass of the Sun, and 18.11 times its radius. It is located 239.60 light years away from the solar system and is estimated to be 4.604 billion years old, as compared to the Sun which is roughly 4.6 billion years old.
4 UMa is known to have 1 exoplanets in orbit around it.
4 UMa b was discovered by the Thueringer Landessternwarte Tautenburg observatory, in 2007-09, using the radial velocity method. Its semi-major axis is 0.87 astronomical units, as compared to Earth's which is 1 astronomical unit. The mass of 4 UMa b is 2257.800 times the mass of Earth. The radius of 4 UMa b is 12.700 that of Earth. At more than 50 Earth masses, 4 UMa 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.