HD 13189 b
HD 13189 b is a cold gas giant orbiting HD 13189 in the constellation Triangulum. It lies about 1,624 light-years from Earth and was discovered in 2005 using the radial velocity method.
Is HD 13189 b in the Habitable Zone?
HD 13189 b orbits inside the inner edge of the habitable zone of HD 13189. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 13189: 16.197–40.643 AU (conservative: 20.516–38.533 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 13189 b — one full orbit around HD 13189 — lasts 471.6 Earth days, longer than an Earth year. It orbits at an average distance of 1.250 AU. Its orbit is mildly elliptical (eccentricity 0.27).
How Was HD 13189 b Discovered?
HD 13189 b was discovered in 2005 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 13189 b?
HD 13189 b is 1,623.7 light-years (497.8 parsecs) from Earth. Light arriving here tonight left the planet about 1,624 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 28,577,120 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 13189 b scores 0.08, ranking #4,778 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 13189
HD 13189
- Surface temperature
- 4,175 K (Sun: 5,772 K)
- Mass
- 2.24 M☉
- Radius
- 38.41 R☉
Planetary System
HD 13189 b is the only planet known to orbit HD 13189 so far.
HD 13189 b — Complete Data
| Mass (best estimate) | 3,480.24 Earth masses |
|---|---|
| Orbital period | 471.60 days |
| Orbital distance | 1.250 AU |
| Eccentricity | 0.270 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,623.7 light-years (497.8 parsecs) |
| Constellation | Triangulum |
| Discovery method | Radial Velocity |
| Discovery facility | Thueringer Landessternwarte Tautenburg |
| Discovery year | 2005 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 13189 b
Is HD 13189 b habitable?
No — HD 13189 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 13189 b?
HD 13189 b is about 1,624 light-years from Earth in the constellation Triangulum. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 28,577,120 years to get there.
How long is a year on HD 13189 b?
One orbit around HD 13189 takes 471.6 Earth days.
Explore HD 13189 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.
