description Gliese 581 b Overview
Gliese 581 b is a Neptune-class exoplanet orbiting the nearby M-dwarf Gliese 581, about 20 light-years from Earth. It has a minimum mass of roughly 16 Earth masses and completes an orbit in about 5.4 days at a distance of only a few hundredths of an astronomical unit. The planet was detected through the radial-velocity technique and is part of a system that has been examined extensively for additional planets, including several later-disputed signals.
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How good is Gliese 581 b?
Gliese 581 b scores 6.62/10 (Fair) on Lunoo, making it rated in the Exoplanet category.
What are the best alternatives to Gliese 581 b?
See our alternatives page for Gliese 581 b for a ranked list with scores. Top alternatives include: YZ Ceti b, Mu Arae c, Wolf 1061 b.
How does Gliese 581 b compare to YZ Ceti b?
See our detailed comparison of Gliese 581 b vs YZ Ceti b with scores, features, and an AI-powered verdict.
Is Gliese 581 b worth it in 2026?
With a score of 6.62/10, Gliese 581 b is a solid option in Exoplanet. See all Exoplanet ranked.
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