Astronomical evidence
TRAPPIST-1 e orbits TRAPPIST-1. The saved catalog gives an orbital period of 6.101013 ± 3.5e-05 days. Its discovery method is recorded as transit. These quantities describe the real astronomical setting behind the illustration. TRAPPIST-1 e belongs to a compact planetary system. Repeated transits constrain size, and gravitational interactions between planets affect transit timing. Those timing variations provide information about masses. Together, mass and radius constrain average density, but they do not uniquely determine interior layers or surface conditions. The catalog radius is 0.92 (+0.013/−0.012) Earth radii. The mass entry is 0.692 ± 0.022 Earth masses. The source papers and full table retain the provenance of each parameter.
The illustrated viewpoint
The pictured ground and atmosphere are speculative. A size close to Earth’s does not establish an Earth-like ocean, air pressure or climate.
The pictured ground and atmosphere are speculative. A size close to Earth’s does not establish an Earth-like ocean, air pressure or climate. All depicted life and technology are fictional.
Catalog measurements & sources
Host: TRAPPIST-1. Snapshot: 25 September 2026. Errors, limits and source provenance are retained. Calculated values and model estimates are not direct measurements. Unknown is not zero; equilibrium temperature is not surface temperature.
| Quantity / unit | Value / reported errors | Source |
|---|---|---|
| Radius · Earth radii | 0.92 (+0.013 / -0.012) | Agol et al. 2021 |
| Mass · Earth masses | 0.692 (+0.022 / -0.022) | Agol et al. 2021 |
| Density · g/cm³ | 4.9016 (+0.165408 / -0.181949) | Agol et al. 2021 |
| Orbital period · days | 6.10101 (+3.5e-05 / -3.5e-05) | Agol et al. 2021 |
| Orbital semimajor axis · AU | 0.02925 (+0.0025 / -0.0025) | Agol et al. 2021 |
| Eccentricity | 0.0051 (+0.00058 / -0.00058) | Grimm et al. 2018 |
| Inclination · degrees | 89.793 (+0.048 / -0.048) | Agol et al. 2021 |
| Irradiation · Earth flux | 0.646 (+0.025 / -0.025) | Agol et al. 2021 |
| Equilibrium temperature · K | 249.7 (+2.4 / -2.4) | Ducrot et al. 2020 |
| Stellar effective temperature · K | 2566 (+26 / -26) | Agol et al. 2021 |
| Stellar radius · Solar | 0.1192 (+0.0013 / -0.0013) | Agol et al. 2021 |
| Stellar mass · Solar | 0.0898 (+0.0023 / -0.0023) | Agol et al. 2021 |
| Stellar luminosity · log Solar | -3.25727 (+0.01467 / -0.01518) | Agol et al. 2021 |
| Stellar age · Gyr | 7.6 (+2.2 / -2.2) | Piaulet-Ghorayeb et al. 2025 |
| Stellar metallicity · dex | 0.052 (+0.073 / -0.073) | Piaulet-Ghorayeb et al. 2025 |
| Distance · pc | 12.4299 (+0.0187066 / -0.0187066) | Gaia DR2 |