HD 89839 b
HD 89839 b is a cold gas giant orbiting HD 89839 in the constellation Vela. It lies about 187 light-years from Earth and was discovered in 2023 using the radial velocity method.
Is HD 89839 b in the Habitable Zone?
The position of HD 89839 b relative to the habitable zone of HD 89839 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 89839 b — one full orbit around HD 89839 — lasts 3,391.2 Earth days, longer than an Earth year. It orbits at an average distance of 4.713 AU. Its orbit is mildly elliptical (eccentricity 0.19).
How Was HD 89839 b Discovered?
HD 89839 b was discovered in 2023 using the radial velocity method, with observations from Multiple Facilities.
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 89839 b?
HD 89839 b is 186.9 light-years (57.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1840. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,289,440 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 89839 b scores 0.17, ranking #4,103 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 89839
HD 89839
- Mass
- 1.21 M☉
Planetary System
HD 89839 b is the only planet known to orbit HD 89839 so far.
HD 89839 b — Complete Data
| Mass (best estimate) | 1,196.90 Earth masses |
|---|---|
| Orbital period | 3,391.20 days |
| Orbital distance | 4.713 AU |
| Eccentricity | 0.185 |
| Earth Similarity Index | 0.17 |
| Distance from Earth | 186.9 light-years (57.3 parsecs) |
| Constellation | Vela |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Facilities |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2026-03-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 89839 b
Is HD 89839 b habitable?
HD 89839 b is not known to orbit within the habitable zone of HD 89839, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 89839 b?
HD 89839 b is about 187 light-years from Earth in the constellation Vela. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,289,440 years to get there.
How long is a year on HD 89839 b?
One orbit around HD 89839 takes 3,391.2 Earth days.
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