description HD 10180 e Overview
HD 10180 e is a radial-velocity exoplanet in the multi-planet system around HD 10180, a Sun-like star about 127 light-years away. It has a minimum mass of roughly 26 Earth masses and an orbital period of about 49.8 days, placing it in the Neptune-mass class. The planet was reported from HARPS observations in 2010 and is one of six confirmed planets listed in the system.
help HD 10180 e FAQ
What type of planet is HD 10180 e?
HD 10180 e is a Neptune-mass radial-velocity planet with a minimum mass of about 25.6 Earth masses. Its radius is not directly measured because the planet is not listed as a transiting world. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
How long does HD 10180 e take to orbit its star?
Its orbital period is about 49.75 days, at a semimajor axis near 0.27 astronomical units. That makes it farther out than HD 10180 d but inside planets such as HD 10180 f. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
How does HD 10180 e compare with HD 10180 d and f?
HD 10180 d has a period of about 16.36 days and a minimum mass near 12 Earth masses, while f takes about 122.74 days and has a minimum mass near 23 Earth masses. Planet e is therefore the middle member in orbital distance, but the most massive of those three by the catalog's minimum-mass values. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
How was HD 10180 e found?
The planet was identified from the repeating Doppler wobble of HD 10180 rather than from a transit across the star. The system's original discovery work was published by Lovis and colleagues in 2011 for the 2010 discovery entry. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/HD%2010180)
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