The HD 12661 system contains 2 exoplanets. It is located 123.44 light years away from the solar system.
| Mass | 1.2 solar masses |
| Radius | 1.2 solar radiae |
| Temperature | 5645 kelvin |
| Stellar Metallicity | 0.36 decimal exponent |
| Age | 6.39 billion years |
At more than 50 Earth masses, HD 12661 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 772.327 Earth masses |
| Density | 1.800 grams per cubic centimeter |
| Radius | 13.300 Earth radiae |
| Semi-major Axis | 0.84 AU |
| Eccentricity | 0.38 |
| Orbital Period | 262.709 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2001-04 |
| Reference | Fischer et al. 2001 |
At more than 50 Earth masses, HD 12661 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 575.884 Earth masses |
| Density | 1.320 grams per cubic centimeter |
| Radius | 13.400 Earth radiae |
| Semi-major Axis | 2.8145 AU |
| Eccentricity | 0.031 |
| Orbital Period | 1708.000 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2003-04 |
| Reference | Fischer et al. 2003 |