HD 8673 b
HD 8673 b is a exoplanet orbiting HD 8673 in the constellation Andromeda. It lies about 124 light-years from Earth and was discovered in 2009 using the radial velocity method.
Is HD 8673 b in the Habitable Zone?
The position of HD 8673 b relative to the habitable zone of HD 8673 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 8673 b — one full orbit around HD 8673 — lasts 1,644.7 Earth days, longer than an Earth year. It orbits at an average distance of 2.970 AU. Its orbit is highly elliptical (eccentricity 0.73), swinging dramatically closer to and farther from its star.
How Was HD 8673 b Discovered?
HD 8673 b was discovered in 2009 using the radial velocity method, with observations from Thueringer Landessternwarte Tautenburg.
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 8673 b?
HD 8673 b is 123.5 light-years (37.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1903. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,173,600 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 8673 b scores 0.37, ranking #647 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 8673
HD 8673 b belongs to a system of 2 stars; it orbits HD 8673.
HD 8673
- Mass
- 1.28 M☉
Planetary System
HD 8673 b is the only planet known to orbit HD 8673 so far.
HD 8673 b — Complete Data
| Mass | 4,210.59 Earth masses (13.248 Jupiter masses) |
|---|---|
| Orbital period | 1,644.69 days |
| Orbital distance | 2.970 AU |
| Eccentricity | 0.730 |
| Earth Similarity Index | 0.37 |
| Distance from Earth | 123.5 light-years (37.9 parsecs) |
| Constellation | Andromeda |
| Discovery method | Radial Velocity |
| Discovery facility | Thueringer Landessternwarte Tautenburg |
| Discovery year | 2009 |
Data: NASA Exoplanet Archive, last updated 2023-06-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 8673 b
Is HD 8673 b habitable?
HD 8673 b is not known to orbit within the habitable zone of HD 8673.
How far away is HD 8673 b?
HD 8673 b is about 124 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,173,600 years to get there.
How long is a year on HD 8673 b?
One orbit around HD 8673 takes 1,644.7 Earth days.
Explore HD 8673 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
