HD 191806 b
HD 191806 b is a cold gas giant orbiting HD 191806 in the constellation Cygnus. It lies about 214 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HD 191806 b in the Habitable Zone?
The position of HD 191806 b relative to the habitable zone of HD 191806 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 191806 b — one full orbit around HD 191806 — lasts 1,603.4 Earth days, longer than an Earth year. It orbits at an average distance of 2.749 AU. Its orbit is mildly elliptical (eccentricity 0.21).
How Was HD 191806 b Discovered?
HD 191806 b was discovered in 2016 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 191806 b?
HD 191806 b is 214.2 light-years (65.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1812. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,769,920 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 191806 b scores 0.29, ranking #1,937 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 191806
HD 191806
- Mass
- 1.07 M☉
Planetary System
HD 191806 b is the only planet known to orbit HD 191806 so far.
HD 191806 b — Complete Data
| Mass | 2,966.61 Earth masses (9.334 Jupiter masses) |
|---|---|
| Orbital period | 1,603.39 days |
| Orbital distance | 2.749 AU |
| Eccentricity | 0.213 |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 214.2 light-years (65.7 parsecs) |
| Constellation | Cygnus |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 191806 b
Is HD 191806 b habitable?
HD 191806 b is not known to orbit within the habitable zone of HD 191806, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 191806 b?
HD 191806 b is about 214 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,769,920 years to get there.
How long is a year on HD 191806 b?
One orbit around HD 191806 takes 1,603.4 Earth days.
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