HD 125271 b
HD 125271 b is a cold gas giant orbiting HD 125271 in the constellation Apus. It lies about 128 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 125271 b in the Habitable Zone?
The position of HD 125271 b relative to the habitable zone of HD 125271 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 125271 b — one full orbit around HD 125271 — lasts 14,902.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 10.817 AU. Its orbit is mildly elliptical (eccentricity 0.17).
How Was HD 125271 b Discovered?
HD 125271 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 125271 b?
HD 125271 b is 128.3 light-years (39.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1898. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,258,080 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 125271 b scores 0.07, ranking #4,821 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 125271
HD 125271
- Mass
- 0.75 M☉
Planetary System
HD 125271 b is the only planet known to orbit HD 125271 so far.
HD 125271 b — Complete Data
| Mass | 3,465.60 Earth masses (10.904 Jupiter masses) |
|---|---|
| Orbital period | 14,901.99 days |
| Orbital distance | 10.817 AU |
| Eccentricity | 0.165 |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 128.3 light-years (39.3 parsecs) |
| Constellation | Apus |
| 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 125271 b
Is HD 125271 b habitable?
HD 125271 b is not known to orbit within the habitable zone of HD 125271, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 125271 b?
HD 125271 b is about 128 light-years from Earth in the constellation Apus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,258,080 years to get there.
How long is a year on HD 125271 b?
One orbit around HD 125271 takes 14,902.0 Earth days.
Explore HD 125271 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.
