HD 5608 b
HD 5608 b is a cold gas giant orbiting the K0 IV star HD 5608 in the constellation Andromeda. It lies about 190 light-years from Earth and was discovered in 2012 using the radial velocity method.
Is HD 5608 b in the Habitable Zone?
HD 5608 b orbits inside the inner edge of the habitable zone of HD 5608. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 5608: 2.986–7.277 AU (conservative: 3.782–6.899 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 5608 b — one full orbit around HD 5608 — lasts 768.7 Earth days, longer than an Earth year. It orbits at an average distance of 1.790 AU. Its orbit is mildly elliptical (eccentricity 0.11).
How Was HD 5608 b Discovered?
HD 5608 b was discovered in 2012 using the radial velocity method, with observations from Okayama Astrophysical 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 5608 b?
HD 5608 b is 189.5 light-years (58.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1837. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,335,200 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 5608 b scores 0.24, ranking #3,283 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 5608
HD 5608 b belongs to a system of 2 stars; it orbits HD 5608.
HD 5608
- Spectral type
- K0 IV
- Surface temperature
- 4,807 K (Sun: 5,772 K)
- Mass
- 1.29 M☉
- Radius
- 5.43 R☉
- Luminosity
- 14.2801 L☉
Planetary System
HD 5608 b is the only planet known to orbit HD 5608 so far.
HD 5608 b — Complete Data
| Mass (best estimate) | 371.22 Earth masses |
|---|---|
| Orbital period | 768.70 days |
| Orbital distance | 1.790 AU |
| Eccentricity | 0.110 |
| Earth Similarity Index | 0.24 |
| Distance from Earth | 189.5 light-years (58.1 parsecs) |
| Constellation | Andromeda |
| Discovery method | Radial Velocity |
| Discovery facility | Okayama Astrophysical Observatory |
| Discovery year | 2012 |
Data: NASA Exoplanet Archive, last updated 2023-09-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 5608 b
Is HD 5608 b habitable?
No — HD 5608 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 5608 b?
HD 5608 b is about 190 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,335,200 years to get there.
How long is a year on HD 5608 b?
One orbit around HD 5608 takes 768.7 Earth days.
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