description HD 40307 b Overview
HD 40307 b is a radial-velocity exoplanet orbiting the K-type star HD 40307, about 42 light-years away. With a minimum mass of roughly four Earth masses and an orbital period of about 4.3 days, it is the innermost of the three planets reported in the system's original 2008 discovery. Its short orbit places it close to the star and exposes it to far more irradiation than Earth receives.
help HD 40307 b FAQ
How good is HD 40307 b?
HD 40307 b scores 6.26/10 (Fair) on Lunoo, making it rated in the Exoplanet category.
What are the best alternatives to HD 40307 b?
See our alternatives page for HD 40307 b for a ranked list with scores. Top alternatives include: 61 Virginis b, HD 10180 c, Wolf 1061 b.
How does HD 40307 b compare to 61 Virginis b?
See our detailed comparison of HD 40307 b vs 61 Virginis b with scores, features, and an AI-powered verdict.
Is HD 40307 b worth it in 2026?
With a score of 6.26/10, HD 40307 b is a solid option in Exoplanet. See all Exoplanet ranked.
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