HD 331093 b
HD 331093 b is a cold gas giant orbiting the K0 star HD 331093 in the constellation Cygnus. It lies about 164 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 331093 b in the Habitable Zone?
The position of HD 331093 b relative to the habitable zone of HD 331093 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 331093 b — one full orbit around HD 331093 — lasts 621.6 Earth days, longer than an Earth year. It orbits at an average distance of 1.440 AU. Its orbit is highly elliptical (eccentricity 0.59), swinging dramatically closer to and farther from its star.
How Was HD 331093 b Discovered?
HD 331093 b was discovered in 2021 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 331093 b?
HD 331093 b is 163.7 light-years (50.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1863. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,881,120 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 331093 b scores 0.37, ranking #660 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 331093
HD 331093
- Spectral type
- K0
- Surface temperature
- 5,544 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
Planetary System
HD 331093 b is the only planet known to orbit HD 331093 so far.
HD 331093 b — Complete Data
| Mass (best estimate) | 476.74 Earth masses |
|---|---|
| Orbital period | 621.62 days |
| Orbital distance | 1.440 AU |
| Eccentricity | 0.590 |
| Earth Similarity Index | 0.37 |
| Distance from Earth | 163.7 light-years (50.2 parsecs) |
| Constellation | Cygnus |
| Discovery method | Radial Velocity |
| Discovery facility | Haute-Provence Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-05-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 331093 b
Is HD 331093 b habitable?
HD 331093 b is not known to orbit within the habitable zone of HD 331093, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 331093 b?
HD 331093 b is about 164 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,881,120 years to get there.
How long is a year on HD 331093 b?
One orbit around HD 331093 takes 621.6 Earth days.
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