description HD 10180 d Overview
HD 10180 d is a radial-velocity exoplanet orbiting the Sun-like star HD 10180 at a distance of about 127 light-years. Its measured minimum mass is approximately 12 Earth masses and its orbital period is about 16.4 days, placing it near the lower end of the Neptune-mass range. It is one of six confirmed planets in the system reported from HARPS data in 2010.
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How was HD 10180 d discovered?
HD 10180 d was detected through radial-velocity measurements of the Sun-like star HD 10180. Its discovery was reported in 2010 as part of a large multi-planet system. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
What are the orbital period and mass of HD 10180 d?
HD 10180 d completes an orbit in about 16.36 days and has a measured minimum mass near 12 Earth masses. Its orbit lies at roughly 0.129 astronomical units from the star. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
How does HD 10180 d differ from HD 10180 e?
HD 10180 d is the closer and lighter of the two, with a 16.36-day orbit and about 12 Earth masses. HD 10180 e orbits in about 49.75 days and has a minimum mass near 25.6 Earth masses. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
How many planets are known around HD 10180?
The NASA Exoplanet Archive overview lists six confirmed planets, named c through h. The star is about 39 parsecs, or roughly 127 light-years, from Earth. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
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