TRAPPIST-1h
TRAPPIST-1h, also designated as 2MASS J23062928-0502285 h, 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. In the following years, more studies were able to refine its physical parameters.
Artist's impression of TRAPPIST-1h. | |
| Discovery | |
|---|---|
| Discovered by | Michaël Gillon et al. |
| Discovery site | Spitzer Space Telescope |
| Discovery date | 22 February 2017 |
| Transit | |
| Orbital characteristics | |
| 0.06189±0.00053 AU | |
| Eccentricity | 0.00567±0.00121 |
| 18.772866±0.000214 d | |
| Inclination | 89.805°±0.013° |
| 338.92°±9.66° | |
| Star | TRAPPIST-1 |
| Physical characteristics | |
Mean radius | 0.755±0.014 R🜨 |
| Mass | 0.326±0.020 M🜨 |
Mean density | 4.147+0.322 −0.302 g/cm3 |
| 0.570±0.038 g 5.58±0.37 m/s2 | |
| Temperature | Teq: 171.7±1.7 K (−101.5 °C; −150.6 °F) |
The outermost known planet in its system, it is roughly one third the mass of Earth, and about 76% as large. Its relatively low density indicates that it is likely water-rich, like several other planets in the system.
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