HD 564 b
HD 564 b is a cold gas giant orbiting the G2/G3 V star HD 564 in the constellation Phoenix. It lies about 167 light-years from Earth and was discovered in 2014 using the radial velocity method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
Is HD 564 b in the Habitable Zone?
HD 564 b orbits inside the conservative habitable zone of HD 564 — the region where a rocky planet could sustain liquid water on its surface. This makes it one of the most interesting known exoplanets in the search for life.
Habitable zone of HD 564: 0.785–1.843 AU (conservative: 0.994–1.748 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 HD 564 b — one full orbit around HD 564 — lasts 492.3 Earth days, longer than an Earth year. It orbits at an average distance of 1.200 AU. Its orbit is mildly elliptical (eccentricity 0.10).
How Was HD 564 b Discovered?
HD 564 b was discovered in 2014 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 564 b?
HD 564 b is 166.9 light-years (51.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1860. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,937,440 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 564 b scores 0.39, ranking #538 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 564
HD 564
- Spectral type
- G2/G3 V
- Surface temperature
- 5,902 K (Sun: 5,772 K)
- Mass
- 0.96 M☉
- Radius
- 1.01 R☉
- Age
- 5.5 billion years (Sun: 4.6)
Planetary System
HD 564 b is the only planet known to orbit HD 564 so far.
HD 564 b — Complete Data
| Mass (best estimate) | 104.88 Earth masses |
|---|---|
| Orbital period | 492.30 days |
| Orbital distance | 1.200 AU |
| Eccentricity | 0.096 |
| Earth Similarity Index | 0.39 |
| Distance from Earth | 166.9 light-years (51.2 parsecs) |
| Constellation | Phoenix |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2014 |
Data: NASA Exoplanet Archive, last updated 2015-01-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 564 b
Is HD 564 b habitable?
HD 564 b orbits within the habitable zone of HD 564, the region where liquid water could exist on a planet's surface. It sits in the conservative habitable zone — the most promising region for habitability. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is HD 564 b?
HD 564 b is about 167 light-years from Earth in the constellation Phoenix. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,937,440 years to get there.
How long is a year on HD 564 b?
One orbit around HD 564 takes 492.3 Earth days.
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