The 4 UMa system contains 1 exoplanet. It is located 239.60 light years away from the solar system.
| Mass | 1.23 solar masses |
| Radius | 18.11 solar radiae |
| Temperature | 4415 kelvin |
| Stellar Metallicity | -0.25 decimal exponent |
| Age | 4.604 billion years |
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.
| Mass | 2256.500 Earth masses |
| Density | 6.050 grams per cubic centimeter |
| Radius | 12.700 Earth radiae |
| Semi-major Axis | 0.87 AU |
| Eccentricity | 0.432 |
| Orbital Period | 269.300 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Thueringer Landessternwarte Tautenburg |
| Discovery Telescope | 2.0 m Alfred Jensch Telescope |
| Discovery Instrument | Coude Echelle Spectrograph |
| Discovery Date | 2007-09 |
| Reference | Dollinger et al. 2007 |