HD 154088 b
HD 154088 b is a super-Earth orbiting the K0 IV-V star HD 154088 in the constellation Ophiuchus. It lies about 60 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 154088 b in the Habitable Zone?
HD 154088 b orbits inside the inner edge of the habitable zone of HD 154088. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 154088: 0.661–1.576 AU (conservative: 0.837–1.494 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 154088 b — one full orbit around HD 154088 — lasts 18.6 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.134 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.34), swinging dramatically closer to and farther from its star.
How Was HD 154088 b Discovered?
HD 154088 b was discovered in 2021 using the radial velocity method, with observations from La Silla 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 154088 b?
HD 154088 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 154088 b scores 0.26, ranking #2,828 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 154088
HD 154088
- Spectral type
- K0 IV-V
- Surface temperature
- 5,374 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Luminosity
- 0.7400 L☉
- Age
- 8.0 billion years (Sun: 4.6)
Planetary System
HD 154088 b is the only planet known to orbit HD 154088 so far.
HD 154088 b — Complete Data
| Mass (best estimate) | 6.60 Earth masses |
|---|---|
| Orbital period | 18.56 days |
| Orbital distance | 0.134 AU |
| Eccentricity | 0.344 |
| Earth Similarity Index | 0.26 |
| Distance from Earth | 59.6 light-years (18.3 parsecs) |
| Constellation | Ophiuchus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-11-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 154088 b
Is HD 154088 b habitable?
No — HD 154088 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 154088 b?
HD 154088 b is about 60 light-years from Earth in the constellation Ophiuchus. 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 154088 b?
One orbit around HD 154088 takes 18.6 Earth days — short enough that 20 of its years would fit into one Earth year.
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