HD 189567 c
HD 189567 c is a super-Earth orbiting the G3 V star HD 189567 in the constellation Pavo. It lies about 58 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 189567 c in the Habitable Zone?
HD 189567 c orbits inside the inner edge of the habitable zone of HD 189567. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 189567: 1.094–2.580 AU (conservative: 1.385–2.446 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 189567 c — one full orbit around HD 189567 — lasts 33.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.197 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.16).
How Was HD 189567 c Discovered?
HD 189567 c 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 189567 c?
HD 189567 c is 58.4 light-years (17.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1968. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,027,840 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 189567 c scores 0.25, ranking #3,054 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 189567
HD 189567
- Spectral type
- G3 V
- Surface temperature
- 5,726 K (Sun: 5,772 K)
- Mass
- 0.83 M☉
- Luminosity
- 2.1100 L☉
- Age
- 11.0 billion years (Sun: 4.6)
The HD 189567 Planetary System
HD 189567 c is one of 2 known planets in the HD 189567 system. Its siblings:
- HD 189567 b (Super Earth)
HD 189567 c — Complete Data
| Mass (best estimate) | 7.00 Earth masses |
|---|---|
| Orbital period | 33.69 days |
| Orbital distance | 0.197 AU |
| Eccentricity | 0.160 |
| Earth Similarity Index | 0.25 |
| Distance from Earth | 58.4 light-years (17.9 parsecs) |
| Constellation | Pavo |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-11-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 189567 c
Is HD 189567 c habitable?
No — HD 189567 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 189567 c?
HD 189567 c is about 58 light-years from Earth in the constellation Pavo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,027,840 years to get there.
How long is a year on HD 189567 c?
One orbit around HD 189567 takes 33.7 Earth days — short enough that 11 of its years would fit into one Earth year.
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