HD 154345 b
HD 154345 b is a cold gas giant orbiting the G8 star HD 154345 in the constellation Hercules. It lies about 60 light-years from Earth and was discovered in 2006 using the radial velocity method.
Is HD 154345 b in the Habitable Zone?
The position of HD 154345 b relative to the habitable zone of HD 154345 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HD 154345 b — one full orbit around HD 154345 — lasts 3,280.0 Earth days, longer than an Earth year. It orbits at an average distance of 4.158 AU. Its orbit is mildly elliptical (eccentricity 0.06).
How Was HD 154345 b Discovered?
HD 154345 b was discovered in 2006 using the radial velocity method, with observations from W. M. Keck 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 154345 b?
HD 154345 b is 59.6 light-years (18.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1967. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,048,960 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 154345 b scores 0.10, ranking #4,433 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 154345
HD 154345
- Spectral type
- G8
- Mass
- 0.89 M☉
Planetary System
HD 154345 b is the only planet known to orbit HD 154345 so far.
HD 154345 b — Complete Data
| Mass | 376.94 Earth masses (1.186 Jupiter masses) |
|---|---|
| Orbital period | 3,280.00 days |
| Orbital distance | 4.158 AU |
| Eccentricity | 0.058 |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 59.6 light-years (18.3 parsecs) |
| Constellation | Hercules |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2006 |
Data: NASA Exoplanet Archive, last updated 2026-03-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 154345 b
Is HD 154345 b habitable?
HD 154345 b is not known to orbit within the habitable zone of HD 154345, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HD 154345 b?
HD 154345 b is about 60 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,048,960 years to get there.
How long is a year on HD 154345 b?
One orbit around HD 154345 takes 3,280.0 Earth days.
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