description HD 3167 c Overview
HD 3167 c is a transiting sub-Neptune orbiting the K-type star HD 3167. Discovered in 2016 through transit observations, it has an orbital period of about 29.8 days and a radius roughly three times that of Earth. Its orbit is strongly misaligned with the star's equatorial plane and is often described as nearly polar, contrasting with the much shorter, more aligned orbit of the system's inner planet HD 3167 b.
help HD 3167 c FAQ
When was HD 3167 c discovered and how long is its orbit?
HD 3167 c was identified in 2016 through transit observations, including data from the K2 mission. It orbits its K-type host star about once every 29.8 days and has a radius close to three Earth radii. ([NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%203167%20c))
Why is HD 3167 c called a sub-Neptune?
Follow-up radial-velocity work estimated a mass of about 8.3 Earth masses and a density near 2.2 grams per cubic centimeter. Those values fit a solid core surrounded by a substantial atmosphere rather than a small, bare rocky planet.
Is HD 3167 c's orbit aligned with its star?
Its orbit is strongly misaligned with the equatorial plane of HD 3167. That makes the system useful for studying how compact planets can occupy very different orbital geometries.
How does HD 3167 c differ from HD 3167 b?
HD 3167 b is the inner planet with an ultra-short period of about 0.96 days, while c takes about 29.8 days. Planet c is also much larger, at roughly three Earth radii compared with b's approximately 1.6 Earth radii.
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