HIP 18606 b
HIP 18606 b is a cold gas giant orbiting the K0/1 III star HIP 18606 in the constellation Eridanus. It lies about 153 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is HIP 18606 b in the Habitable Zone?
HIP 18606 b orbits inside the inner edge of the habitable zone of HIP 18606. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HIP 18606: 2.671–6.495 AU (conservative: 3.384–6.158 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 HIP 18606 b — one full orbit around HIP 18606 — lasts 674.9 Earth days, longer than an Earth year. It orbits at an average distance of 1.610 AU.
How Was HIP 18606 b Discovered?
HIP 18606 b was discovered in 2025 using the radial velocity method, with observations from Multiple Observatories.
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 HIP 18606 b?
HIP 18606 b is 153.4 light-years (47.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1873. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,699,840 years to make the journey.
The Host Star: HIP 18606
HIP 18606
- Spectral type
- K0/1 III
- Surface temperature
- 4,860 K (Sun: 5,772 K)
- Mass
- 1.21 M☉
- Radius
- 4.83 R☉
- Luminosity
- 11.4815 L☉
- Age
- 5.3 billion years (Sun: 4.6)
Planetary System
HIP 18606 b is the only planet known to orbit HIP 18606 so far.
HIP 18606 b — Complete Data
| Mass (best estimate) | 244.73 Earth masses |
|---|---|
| Orbital period | 674.94 days |
| Orbital distance | 1.610 AU |
| Distance from Earth | 153.4 light-years (47.0 parsecs) |
| Constellation | Eridanus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 18606 b
Is HIP 18606 b habitable?
No — HIP 18606 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HIP 18606 b?
HIP 18606 b is about 153 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,699,840 years to get there.
How long is a year on HIP 18606 b?
One orbit around HIP 18606 takes 674.9 Earth days.
Explore HIP 18606 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.
