Exoplanet CatalogExoplanet TRAPPIST-1 h
Radius0.76 R⊕Earth = 1
Mass0.3 M⊕Earth = 1
Orbital period18.77 d
Equilibrium temp.172 K≈ -101 °C
Distance40.5 ly
Discovered2017Transit
Size compared (radius, Earth = 1)
0.76
1.00
3.88
11.21
Where it sits among all planets (percentile)
1%
1%
64%
5%
2%
Share of planets with a smaller value (of 6,445 planets, where known).
Planets of TRAPPIST-1 (7)
| Planet | Period (d) | Radius (R⊕) | Mass (M⊕) | Eq. temp K | Year |
|---|---|---|---|---|---|
| TRAPPIST-1 b | 1.51 | 1.12 | 1.4 | 398 | 2016 |
| TRAPPIST-1 c | 2.42 | 1.10 | 1.3 | 340 | 2016 |
| TRAPPIST-1 d | 4.05 | 0.79 | 0.4 | 286 | 2016 |
| TRAPPIST-1 e | 6.10 | 0.92 | 0.7 | 250 | 2017 |
| TRAPPIST-1 f | 9.21 | 1.04 | 1.0 | 218 | 2017 |
| TRAPPIST-1 g | 12.35 | 1.13 | 1.3 | 197 | 2017 |
| TRAPPIST-1 h | 18.77 | 0.76 | 0.3 | 172 | 2017 |
| Host star | Spectral type | Teff K | Radius (R☉) | Mass (M☉) |
|---|---|---|---|---|
| TRAPPIST-1 | M8.0 V | 2,566 | 0.12 | 0.09 |
Values are NASA Exoplanet Archive estimates and may change. Equilibrium temperature is a theoretical value ignoring any atmosphere.