HD 125390 b
HD 125390 b is a exoplanet orbiting HD 125390 in the constellation Boötes. It lies about 501 light-years from Earth and was discovered in 2019 using the radial velocity method.
Is HD 125390 b in the Habitable Zone?
The position of HD 125390 b relative to the habitable zone of HD 125390 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 125390 b — one full orbit around HD 125390 — lasts 1,757.4 Earth days, longer than an Earth year. It orbits at an average distance of 3.496 AU. Its orbit is highly elliptical (eccentricity 0.60), swinging dramatically closer to and farther from its star.
How Was HD 125390 b Discovered?
HD 125390 b was discovered in 2019 using the radial velocity method, with observations from W. M. Keck 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 125390 b?
HD 125390 b is 501.1 light-years (153.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1525. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 8,819,360 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 125390 b scores 0.39, ranking #503 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 125390
HD 125390
- Mass
- 1.82 M☉
Planetary System
HD 125390 b is the only planet known to orbit HD 125390 so far.
HD 125390 b — Complete Data
| Mass | 8,646.20 Earth masses (27.204 Jupiter masses) |
|---|---|
| Orbital period | 1,757.39 days |
| Orbital distance | 3.496 AU |
| Eccentricity | 0.597 |
| Earth Similarity Index | 0.39 |
| Distance from Earth | 501.1 light-years (153.6 parsecs) |
| Constellation | Boötes |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2019 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 125390 b
Is HD 125390 b habitable?
HD 125390 b is not known to orbit within the habitable zone of HD 125390.
How far away is HD 125390 b?
HD 125390 b is about 501 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 8,819,360 years to get there.
How long is a year on HD 125390 b?
One orbit around HD 125390 takes 1,757.4 Earth days.
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