Astronomical evidence
TRAPPIST-1 e is one of seven approximately Earth-sized planets orbiting a small ultracool dwarf. The saved catalog gives a radius of 0.920 Earth radii, with +0.013/−0.012 uncertainty, and a mass of 0.692 ± 0.022 Earth masses. [1] These measurements support a predominantly rocky bulk composition without revealing surface geography. Atmospheric characterization remains difficult: stellar surface features can contaminate transmission spectra, and neither a blue ocean nor a breathable atmosphere follows from a planet's location in the habitable zone. [2] The courtyard is a speculative setting for this real compact planetary system.
The illustrated viewpoint
Copper-skinned humanoid with a paired cranial ridge and layered armor in meditation. A speculative sheltered surface courtyard on TRAPPIST-1 e. The terrain, sky color, shelter, warrior, mural and local atmosphere are hypothetical. The dark sky and low host star illustrate a possible viewing arrangement rather than a measured climate or permanent terminator. Tiny additional lights evoke companion planets; no identities or conjunction date are assigned. Their apparent positions and brightnesses are not a sky prediction. The reflecting basin and possible reflective channels are invented; the image is not evidence for liquid water.
The terrain, sky color, shelter, warrior, mural and local atmosphere are hypothetical. The dark sky and low host star illustrate a possible viewing arrangement rather than a measured climate or permanent terminator. Tiny additional lights evoke companion planets; no identities or conjunction date are assigned. Their apparent positions and brightnesses are not a sky prediction. The reflecting basin and possible reflective channels are invented; the image is not evidence for liquid water. All beings and cultures are fictional. Apparent sizes, phases and exposure are artistic, not a calibrated sky simulation. Cosmic connection is a visual theme, not an observed biological mechanism.
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 |