TRAPPIST-1g
TRAPPIST-1g, also designated as 2MASS J23062928-0502285 g and K2-112 g, is an exoplanet orbiting around the ultra-cool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation Aquarius. It was one of four new exoplanets to be discovered orbiting the star in 2017 using observations from the Spitzer Space Telescope. The exoplanet is within the optimistic habitable zone of its host star. It was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.
Artist's impression of TRAPPIST-1g. (February 2018) | |
| Discovery | |
|---|---|
| Discovered by | Michaël Gillon et al. |
| Discovery site | Spitzer Space Telescope |
| Discovery date | 22 February 2017 |
| Transit | |
| Orbital characteristics | |
| 0.04683±0.00040 AU | |
| Eccentricity | 0.00208±0.00058 |
| 12.352446±0.000054 d | |
| Inclination | 89.742°±0.012° |
| 191.34°±13.83° | |
| Star | TRAPPIST-1 |
| Physical characteristics | |
Mean radius | 1.129+0.015 −0.013 R🜨 |
| Mass | 1.321±0.038 M🜨 |
Mean density | 5.042+0.136 −0.158 g/cm3 |
| 1.035±0.026 g 10.15±0.25 m/s2 | |
| Temperature | Teq: 197.3±1.9 K (−75.8 °C; −104.5 °F) |
The second most distant known planet in its system, TRAPPIST-1g is a planet somewhat larger than Earth and with a similar density, meaning it is likely a rocky planet.
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