TRAPPIST-1 d — TRAPPIST-1 System
Cataloged by the NASA Exoplanet Archive TAP service, TRAPPIST-1 d orbits host star TRAPPIST-1 every 4.05 days at a distance of 12.43 parsecs (40.54 light-years). With a planetary radius of 0.79 R⊕, equilibrium temperature of 286 K, and habitability index of 0.84, it represents a premier target for transmission spectroscopy of water vapor, carbon dioxide, and biosignature disequilibrium gases.
Caltech / NASA Exoplanet Archive TAP Parameters
Habitable-Zone Frequently Asked Questions
How far away is exoplanet TRAPPIST-1 d from Earth?
TRAPPIST-1 d is located 12.43 parsecs (40.54 light-years) from Earth, completing one full orbit around TRAPPIST-1 every 4.05 days.
What makes TRAPPIST-1 d a primary AstroTale habitable-zone candidate?
With a radius of 0.79 R⊕ and an equilibrium temperature of 286 K, TRAPPIST-1 d achieves a 84% Earth Similarity Score—placing it inside the circumstellar zone where liquid water can persist under moderate atmospheric pressure.
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