HD 136925 b
HD 136925 b is a cold gas giant orbiting HD 136925 in the constellation Serpens. It lies about 156 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 136925 b in the Habitable Zone?
HD 136925 b orbits beyond the outer edge of the habitable zone of HD 136925. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 136925: 0.894–2.107 AU (conservative: 1.133–1.997 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 136925 b — one full orbit around HD 136925 — lasts 4,540.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 5.130 AU. Its orbit is mildly elliptical (eccentricity 0.10).
How Was HD 136925 b Discovered?
HD 136925 b was discovered in 2021 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 136925 b?
HD 136925 b is 156.1 light-years (47.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1870. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,747,360 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 136925 b scores 0.12, ranking #4,343 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 136925
HD 136925
- Surface temperature
- 5,773 K (Sun: 5,772 K)
- Mass
- 0.88 M☉
- Radius
- 1.19 R☉
Planetary System
HD 136925 b is the only planet known to orbit HD 136925 so far.
HD 136925 b — Complete Data
| Mass (best estimate) | 266.98 Earth masses |
|---|---|
| Orbital period | 4,540.00 days |
| Orbital distance | 5.130 AU |
| Eccentricity | 0.103 |
| Earth Similarity Index | 0.12 |
| Distance from Earth | 156.1 light-years (47.9 parsecs) |
| Constellation | Serpens |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-09-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 136925 b
Is HD 136925 b habitable?
No — HD 136925 b orbits outside the habitable zone of HD 136925 and is likely too cold for liquid water on its surface.
How far away is HD 136925 b?
HD 136925 b is about 156 light-years from Earth in the constellation Serpens. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,747,360 years to get there.
How long is a year on HD 136925 b?
One orbit around HD 136925 takes 4,540.0 Earth days.
Explore HD 136925 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.
