K2-18 b — K2-18 System
Cataloged by the NASA Exoplanet Archive TAP service, K2-18 b orbits host star K2-18 every 32.94 days at a distance of 38.07 parsecs (124.17 light-years). With a planetary radius of 2.61 R⊕, equilibrium temperature of 284 K, and habitability index of 0.82, 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 K2-18 b from Earth?
K2-18 b is located 38.07 parsecs (124.17 light-years) from Earth, completing one full orbit around K2-18 every 32.94 days.
What makes K2-18 b a primary AstroTale habitable-zone candidate?
With a radius of 2.61 R⊕ and an equilibrium temperature of 284 K, K2-18 b achieves a 82% Earth Similarity Score—placing it inside the circumstellar zone where liquid water can persist under moderate atmospheric pressure.
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