HD 100508 b
HD 100508 b is a cold gas giant orbiting the K1 IV star HD 100508 in the constellation Musca. It lies about 107 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is HD 100508 b in the Habitable Zone?
The position of HD 100508 b relative to the habitable zone of HD 100508 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 100508 b — one full orbit around HD 100508 — lasts 5,681.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 6.110 AU. Its orbit is highly elliptical (eccentricity 0.42), swinging dramatically closer to and farther from its star.
How Was HD 100508 b Discovered?
HD 100508 b was discovered in 2026 using the radial velocity method, with observations from Las Campanas 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 100508 b?
HD 100508 b is 106.8 light-years (32.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1920. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,879,680 years to make the journey.
The Host Star: HD 100508
HD 100508
- Spectral type
- K1 IV
- Surface temperature
- 5,419 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
Planetary System
HD 100508 b is the only planet known to orbit HD 100508 so far.
HD 100508 b — Complete Data
| Mass | 381.39 Earth masses (1.200 Jupiter masses) |
|---|---|
| Orbital period | 5,681.00 days |
| Orbital distance | 6.110 AU |
| Eccentricity | 0.420 |
| Distance from Earth | 106.8 light-years (32.8 parsecs) |
| Constellation | Musca |
| Discovery method | Radial Velocity |
| Discovery facility | Las Campanas Observatory |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-03-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 100508 b
Is HD 100508 b habitable?
HD 100508 b is not known to orbit within the habitable zone of HD 100508, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 100508 b?
HD 100508 b is about 107 light-years from Earth in the constellation Musca. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,879,680 years to get there.
How long is a year on HD 100508 b?
One orbit around HD 100508 takes 5,681.0 Earth days.
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