HD 164595 b
HD 164595 b is a Neptune-like planet orbiting the G2 V star HD 164595 in the constellation Hercules. It lies about 92 light-years from Earth and was discovered in 2015 using the radial velocity method.
Is HD 164595 b in the Habitable Zone?
The position of HD 164595 b relative to the habitable zone of HD 164595 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 164595 b — one full orbit around HD 164595 — lasts 40.0 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.230 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was HD 164595 b Discovered?
HD 164595 b was discovered in 2015 using the radial velocity method, with observations from Haute-Provence 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 164595 b?
HD 164595 b is 92.2 light-years (28.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1934. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,622,720 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 164595 b scores 0.23, ranking #3,533 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 164595
HD 164595 b belongs to a system of 2 stars; it orbits HD 164595.
HD 164595
- Spectral type
- G2 V
- Surface temperature
- 5,790 K (Sun: 5,772 K)
- Mass
- 0.99 M☉
Planetary System
HD 164595 b is the only planet known to orbit HD 164595 so far.
HD 164595 b — Complete Data
| Mass (best estimate) | 16.14 Earth masses |
|---|---|
| Orbital period | 40.00 days |
| Orbital distance | 0.230 AU |
| Eccentricity | 0.088 |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 92.2 light-years (28.3 parsecs) |
| Constellation | Hercules |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2015 |
Data: NASA Exoplanet Archive, last updated 2015-09-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 164595 b
Is HD 164595 b habitable?
HD 164595 b is not known to orbit within the habitable zone of HD 164595, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is HD 164595 b?
HD 164595 b is about 92 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,622,720 years to get there.
How long is a year on HD 164595 b?
One orbit around HD 164595 takes 40.0 Earth days.
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