Astronomical evidence
TRAPPIST-1 f orbits TRAPPIST-1. The saved catalog gives an orbital period of 9.20754 ± 3.2e-05 days. Its discovery method is recorded as transit. These quantities describe the real astronomical setting behind the illustration. TRAPPIST-1 f’s mass and radius can be compared with those of its neighboring planets. In a compact system, mutual gravity perturbs otherwise regular transit times; fitting those departures helps constrain the masses. The resulting density informs interior models, but does not identify individual layers uniquely. The catalog radius is 1.045 (+0.013/−0.012) Earth radii. The mass entry is 1.039 ± 0.031 Earth masses. The source papers and full table retain the provenance of each parameter.
The illustrated viewpoint
The snowy ground is speculative. Snow requires a composition and a pressure–temperature environment that are not determined merely by an Earth-scale radius.
The snowy ground is speculative. Snow requires a composition and a pressure–temperature environment that are not determined merely by an Earth-scale radius. 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 | 1.045 (+0.013 / -0.012) | Agol et al. 2021 |
| Mass · Earth masses | 1.039 (+0.031 / -0.031) | Agol et al. 2021 |
| Density · g/cm³ | 5.0229 (+0.13784 / -0.159895) | Agol et al. 2021 |
| Orbital period · days | 9.20754 (+3.2e-05 / -3.2e-05) | Agol et al. 2021 |
| Orbital semimajor axis · AU | 0.03849 (+0.00033 / -0.00033) | Agol et al. 2021 |
| Eccentricity | 0.01007 (+0.00068 / -0.00068) | Grimm et al. 2018 |
| Inclination · degrees | 89.74 (+0.019 / -0.019) | Agol et al. 2021 |
| Irradiation · Earth flux | 0.373 (+0.015 / -0.014) | Agol et al. 2021 |
| Equilibrium temperature · K | 217.7 (+2.1 / -2.1) | 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 |