The TRAPPIST-1 system contains 7 exoplanets. It is located 40.54 light years away from the solar system.
| Mass | 0.09 solar masses |
| Radius | 0.12 solar radiae |
| Temperature | 2566 kelvin |
| Stellar Metallicity | 0.04 decimal exponent |
| Age | 0.5 billion years |
At less than 1.5 Earth masses, TRAPPIST-1 b is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 1.374 Earth masses |
| Density | 5.442 grams per cubic centimeter |
| Radius | 1.116 Earth radiae |
| Semi-major Axis | 0.01154 AU |
| Eccentricity | 0.00622 |
| Orbital Period | 1.511 days |
| Discovery Method | Transit |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 0.60 m Transiting Planets and Planetesimals Small Telescope |
| Discovery Instrument | TRAPPISTCAM |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |
At less than 1.5 Earth masses, TRAPPIST-1 c is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 1.308 Earth masses |
| Density | 5.464 grams per cubic centimeter |
| Radius | 1.097 Earth radiae |
| Semi-major Axis | 0.0158 AU |
| Eccentricity | 0.00654 |
| Orbital Period | 2.422 days |
| Discovery Method | Transit |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 0.60 m Transiting Planets and Planetesimals Small Telescope |
| Discovery Instrument | TRAPPISTCAM |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |
At less than 1.5 Earth masses, TRAPPIST-1 d is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 0.388 Earth masses |
| Density | 4.367 grams per cubic centimeter |
| Radius | 0.788 Earth radiae |
| Semi-major Axis | 0.02227 AU |
| Eccentricity | 0.00837 |
| Orbital Period | 4.049 days |
| Discovery Method | Transit |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 0.60 m Transiting Planets and Planetesimals Small Telescope |
| Discovery Instrument | TRAPPISTCAM |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |
At less than 1.5 Earth masses, TRAPPIST-1 e is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars. TRAPPIST-1 e orbits within the habitable zone of its parent star and could, potentially, be a habitable planet with stable bodies of liquid water on its surface, like Earth.
| Mass | 0.692 Earth masses |
| Density | 4.902 grams per cubic centimeter |
| Radius | 0.920 Earth radiae |
| Semi-major Axis | 0.02925 AU |
| Eccentricity | 0.0051 |
| Orbital Period | 6.101 days |
| Discovery Method | Transit |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |
At less than 1.5 Earth masses, TRAPPIST-1 f is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars. TRAPPIST-1 f orbits within the habitable zone of its parent star and could, potentially, be a habitable planet with stable bodies of liquid water on its surface, like Earth.
| Mass | 1.039 Earth masses |
| Density | 5.023 grams per cubic centimeter |
| Radius | 1.045 Earth radiae |
| Semi-major Axis | 0.03849 AU |
| Eccentricity | 0.01007 |
| Orbital Period | 9.208 days |
| Discovery Method | Transit |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |
At less than 1.5 Earth masses, TRAPPIST-1 g is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars. TRAPPIST-1 g orbits within the habitable zone of its parent star and could, potentially, be a habitable planet with stable bodies of liquid water on its surface, like Earth.
| Mass | 1.321 Earth masses |
| Density | 5.056 grams per cubic centimeter |
| Radius | 1.129 Earth radiae |
| Semi-major Axis | 0.04683 AU |
| Eccentricity | 0.00208 |
| Orbital Period | 12.352 days |
| Discovery Method | Transit |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |
At less than 1.5 Earth masses, TRAPPIST-1 h is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars. With a mass below 5 Earth masses, and a semi-major axis of 0.06189 astronomical units, which is outside the habitable zone of TRAPPIST-1, TRAPPIST-1 h is likely an icy world.
| Mass | 0.326 Earth masses |
| Density | 4.163 grams per cubic centimeter |
| Radius | 0.755 Earth radiae |
| Semi-major Axis | 0.06189 AU |
| Eccentricity | 0.00567 |
| Orbital Period | 18.773 days |
| Discovery Method | Transit |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2016-05 |
| Reference | Gillon et al. 2016 |