The HD 187123 system contains 2 exoplanets. It is located 149.88 light years away from the solar system.
| Mass | 1.04 solar masses |
| Radius | 1.15 solar radiae |
| Temperature | 5790 kelvin |
| Stellar Metallicity | 0.09 decimal exponent |
| Age | 7.4 billion years |
At more than 50 Earth masses, HD 187123 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 166.218 Earth masses |
| Density | 0.319 grams per cubic centimeter |
| Radius | 14.200 Earth radiae |
| Semi-major Axis | 0.0426 AU |
| Eccentricity | 0.0103 |
| Orbital Period | 3.097 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | W. M. Keck Observatory |
| Discovery Telescope | 10 m Keck I Telescope |
| Discovery Instrument | HIRES Spectrometer |
| Discovery Date | 1998-12 |
| Reference | Butler et al. 1998 |
At more than 50 Earth masses, HD 187123 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 632.460 Earth masses |
| Density | 1.440 grams per cubic centimeter |
| Radius | 13.400 Earth radiae |
| Semi-major Axis | 4.89 AU |
| Eccentricity | 0.252 |
| Orbital Period | 3810.000 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | W. M. Keck Observatory |
| Discovery Telescope | 10 m Keck I Telescope |
| Discovery Instrument | HIRES Spectrometer |
| Discovery Date | 2009-03 |
| Reference | Wright et al. 2009 |