The BD+20 2457 system contains 2 exoplanets. It is located 5021.86 light years away from the solar system.
| Mass | 10.83 solar masses |
| Radius | 71.02 solar radiae |
| Temperature | 4259 kelvin |
| Stellar Metallicity | -0.79 decimal exponent |
| Age | - billion years |
At more than 50 Earth masses, BD+20 2457 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 17668.170 Earth masses |
| Density | 62.200 grams per cubic centimeter |
| Radius | 11.600 Earth radiae |
| Semi-major Axis | 1.05 AU |
| Eccentricity | 0.15 |
| Orbital Period | 379.630 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | McDonald Observatory |
| Discovery Telescope | 9.2 m Hobby-Eberly Telescope |
| Discovery Instrument | High Resolution Spectrograph |
| Discovery Date | 2009-12 |
| Reference | Niedzielski et al. 2009 |
At more than 50 Earth masses, BD+20 2457 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 3963.170 Earth masses |
| Density | 11.400 grams per cubic centimeter |
| Radius | 12.400 Earth radiae |
| Semi-major Axis | 2.01 AU |
| Eccentricity | 0.18 |
| Orbital Period | 621.990 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | McDonald Observatory |
| Discovery Telescope | 9.2 m Hobby-Eberly Telescope |
| Discovery Instrument | High Resolution Spectrograph |
| Discovery Date | 2009-12 |
| Reference | Niedzielski et al. 2009 |