description HD 219134 d Overview
HD 219134 d is an extrasolar planet orbiting the nearby K-type star HD 219134 in the constellation Cassiopeia, about 21 light-years from Earth. It was identified through radial-velocity measurements and has a minimum mass in the Neptune range, which is why it is commonly classified as a mini-Neptune or Neptune-mass planet. Unlike the system's inner planet b, it has not been established as a transiting planet, so its radius and bulk composition are less directly constrained.
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How good is HD 219134 d?
HD 219134 d scores 6.26/10 (Fair) on Lunoo, making it rated in the Exoplanet category.
What are the best alternatives to HD 219134 d?
See our alternatives page for HD 219134 d for a ranked list with scores. Top alternatives include: Tau Ceti g, HD 192310 b, HD 40307 c.
How does HD 219134 d compare to Tau Ceti g?
See our detailed comparison of HD 219134 d vs Tau Ceti g with scores, features, and an AI-powered verdict.
Is HD 219134 d worth it in 2026?
With a score of 6.26/10, HD 219134 d is a solid option in Exoplanet. See all Exoplanet ranked.
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