HD 136118 b
HD 136118 b is a exoplanet orbiting HD 136118 in the constellation Serpens. It lies about 168 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 136118 b in the Habitable Zone?
The position of HD 136118 b relative to the habitable zone of HD 136118 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 136118 b — one full orbit around HD 136118 — lasts 1,187.6 Earth days, longer than an Earth year. It orbits at an average distance of 2.327 AU. Its orbit is highly elliptical (eccentricity 0.34), swinging dramatically closer to and farther from its star.
How Was HD 136118 b Discovered?
HD 136118 b was discovered in 2022 using the radial velocity method, with observations from Multiple Observatories.
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 136118 b?
HD 136118 b is 167.8 light-years (51.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1859. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,953,280 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 136118 b scores 0.39, ranking #528 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 136118
HD 136118
- Mass
- 1.18 M☉
Planetary System
HD 136118 b is the only planet known to orbit HD 136118 so far.
HD 136118 b — Complete Data
| Mass | 4,164.19 Earth masses (13.102 Jupiter masses) |
|---|---|
| Orbital period | 1,187.60 days |
| Orbital distance | 2.327 AU |
| Eccentricity | 0.344 |
| Earth Similarity Index | 0.39 |
| Distance from Earth | 167.8 light-years (51.4 parsecs) |
| Constellation | Serpens |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 136118 b
Is HD 136118 b habitable?
HD 136118 b is not known to orbit within the habitable zone of HD 136118.
How far away is HD 136118 b?
HD 136118 b is about 168 light-years from Earth in the constellation Serpens. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,953,280 years to get there.
How long is a year on HD 136118 b?
One orbit around HD 136118 takes 1,187.6 Earth days.
Explore HD 136118 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
