HD 165131 b
HD 165131 b is a exoplanet orbiting the G3/5 V star HD 165131 in the constellation Sagittarius. It lies about 187 light-years from Earth and was discovered in 2023 using the radial velocity method.
Is HD 165131 b in the Habitable Zone?
The position of HD 165131 b relative to the habitable zone of HD 165131 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 165131 b — one full orbit around HD 165131 — lasts 2,342.6 Earth days, longer than an Earth year. It orbits at an average distance of 3.540 AU. Its orbit is highly elliptical (eccentricity 0.67), swinging dramatically closer to and farther from its star.
How Was HD 165131 b Discovered?
HD 165131 b was discovered in 2023 using the radial velocity method, with observations from Multiple Facilities.
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 165131 b?
HD 165131 b is 187.3 light-years (57.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1839. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,296,480 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 165131 b scores 0.19, ranking #3,967 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 165131
HD 165131
- Spectral type
- G3/5 V
- Surface temperature
- 5,870 K (Sun: 5,772 K)
- Mass
- 1.06 M☉
Planetary System
HD 165131 b is the only planet known to orbit HD 165131 so far.
HD 165131 b — Complete Data
| Mass | 5,943.39 Earth masses (18.700 Jupiter masses) |
|---|---|
| Orbital period | 2,342.60 days |
| Orbital distance | 3.540 AU |
| Eccentricity | 0.671 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 187.3 light-years (57.4 parsecs) |
| Constellation | Sagittarius |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Facilities |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 165131 b
Is HD 165131 b habitable?
HD 165131 b is not known to orbit within the habitable zone of HD 165131.
How far away is HD 165131 b?
HD 165131 b is about 187 light-years from Earth in the constellation Sagittarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,296,480 years to get there.
How long is a year on HD 165131 b?
One orbit around HD 165131 takes 2,342.6 Earth days.
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