HD 10180 e
HD 10180 e is a Neptune-like planet orbiting HD 10180 in the constellation Hydrus. It lies about 127 light-years from Earth and was discovered in 2010 using the radial velocity method.
Is HD 10180 e in the Habitable Zone?
HD 10180 e orbits inside the inner edge of the habitable zone of HD 10180. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 10180: 0.864–2.029 AU (conservative: 1.094–1.923 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 10180 e — one full orbit around HD 10180 — lasts 49.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.270 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.05).
How Was HD 10180 e Discovered?
HD 10180 e was discovered in 2010 using the radial velocity method, with observations from La Silla Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 10180 e?
HD 10180 e is 127.1 light-years (39.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1899. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,236,960 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. HD 10180 e scores 0.20, ranking #3,922 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 10180
HD 10180
- Surface temperature
- 5,911 K (Sun: 5,772 K)
- Mass
- 1.06 M☉
- Radius
- 1.11 R☉
The HD 10180 Planetary System
HD 10180 e is one of 6 known planets in the HD 10180 system. Its siblings:
- HD 10180 c (Neptune-like)
- HD 10180 d (Neptune-like)
- HD 10180 f (Neptune-like)
- HD 10180 g (Neptune-like)
- HD 10180 h (Cold Gas Giant)
HD 10180 e — Complete Data
| Mass (best estimate) | 25.59 Earth masses |
|---|---|
| Orbital period | 49.75 days |
| Orbital distance | 0.270 AU |
| Eccentricity | 0.051 |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 127.1 light-years (39.0 parsecs) |
| Constellation | Hydrus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2010 |
Data: NASA Exoplanet Archive, last updated 2015-06-24. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 10180 e
Is HD 10180 e habitable?
No — HD 10180 e orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 10180 e?
HD 10180 e is about 127 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,236,960 years to get there.
How long is a year on HD 10180 e?
One orbit around HD 10180 takes 49.7 Earth days.
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