Proxima Cen b — Proxima Cen System
Cataloged by the NASA Exoplanet Archive TAP service, Proxima Cen b orbits host star Proxima Cen every 11.186 days at a distance of 1.301 parsecs (4.24 light-years). With a planetary radius of 1.03 R⊕, equilibrium temperature of 234 K, and habitability index of 0.89, 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 Proxima Cen b from Earth?
Proxima Cen b is located 1.30 parsecs (4.24 light-years) from Earth, completing one full orbit around Proxima Cen every 11.186 days.
What makes Proxima Cen b a primary AstroTale habitable-zone candidate?
With a radius of 1.03 R⊕ and an equilibrium temperature of 234 K, Proxima Cen b achieves a 89% Earth Similarity Score—placing it inside the circumstellar zone where liquid water can persist under moderate atmospheric pressure.
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