The HD 40307 system contains 5 exoplanets. It is located 42.19 light years away from the solar system.
| Mass | 0.77 solar masses |
| Radius | 0.72 solar radiae |
| Temperature | 4956 kelvin |
| Stellar Metallicity | -0.31 decimal exponent |
| Age | 4.5 billion years |
At 4.007 Earth masses, HD 40307 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 4.000 Earth masses |
| Density | 3.590 grams per cubic centimeter |
| Radius | 1.830 Earth radiae |
| Semi-major Axis | 0.0468 AU |
| Eccentricity | 0.2 |
| Orbital Period | 4.312 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2009-01 |
| Reference | Mayor et al. 2009 |
At more than 10 Earth masses, HD 40307 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 6.600 Earth masses |
| Density | 2.440 grams per cubic centimeter |
| Radius | 2.460 Earth radiae |
| Semi-major Axis | 0.0799 AU |
| Eccentricity | 0.06 |
| Orbital Period | 9.618 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2009-01 |
| Reference | Mayor et al. 2009 |
At more than 10 Earth masses, HD 40307 d is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 9.500 Earth masses |
| Density | 1.860 grams per cubic centimeter |
| Radius | 3.040 Earth radiae |
| Semi-major Axis | 0.1321 AU |
| Eccentricity | 0.07 |
| Orbital Period | 20.432 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2009-01 |
| Reference | Mayor et al. 2009 |
At more than 10 Earth masses, HD 40307 f is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 5.200 Earth masses |
| Density | 2.960 grams per cubic centimeter |
| Radius | 2.130 Earth radiae |
| Semi-major Axis | 0.247 AU |
| Eccentricity | 0.02 |
| Orbital Period | 51.760 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2013-01 |
| Reference | Tuomi et al. 2013 |
At more than 10 Earth masses, HD 40307 g is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 7.100 Earth masses |
| Density | 2.330 grams per cubic centimeter |
| Radius | 2.560 Earth radiae |
| Semi-major Axis | 0.6 AU |
| Eccentricity | 0.29 |
| Orbital Period | 197.800 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2013-01 |
| Reference | Tuomi et al. 2013 |