HD 202206 c
HD 202206 c is a exoplanet orbiting the G6 V star HD 202206 in the constellation Capricornus. It lies about 150 light-years from Earth and was discovered in 2004 using the radial velocity method.
Is HD 202206 c in the Habitable Zone?
HD 202206 c orbits beyond the outer edge of the habitable zone of HD 202206. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 202206: 0.778–1.833 AU (conservative: 0.985–1.738 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 202206 c — one full orbit around HD 202206 — lasts 1,260.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.410 AU. Its orbit is mildly elliptical (eccentricity 0.22).
How Was HD 202206 c Discovered?
HD 202206 c was discovered in 2004 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 202206 c?
HD 202206 c is 149.9 light-years (46.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1877. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,638,240 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 202206 c scores 0.23, ranking #3,484 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 202206
HD 202206 c is a circumbinary planet — it orbits around two stars at once, like Tatooine in Star Wars.
HD 202206
- Spectral type
- G6 V
- Surface temperature
- 5,766 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 1.04 R☉
- Age
- 2.9 billion years (Sun: 4.6)
Planetary System
HD 202206 c is the only planet known to orbit HD 202206 so far.
HD 202206 c — Complete Data
| Mass | 5,689.16 Earth masses (17.900 Jupiter masses) |
|---|---|
| Orbital period | 1,260.00 days |
| Orbital distance | 2.410 AU |
| Eccentricity | 0.220 |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 149.9 light-years (46.0 parsecs) |
| Constellation | Capricornus |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2004 |
Data: NASA Exoplanet Archive, last updated 2018-05-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 202206 c
Is HD 202206 c habitable?
No — HD 202206 c orbits outside the habitable zone of HD 202206 and is likely too cold for liquid water on its surface.
How far away is HD 202206 c?
HD 202206 c is about 150 light-years from Earth in the constellation Capricornus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,638,240 years to get there.
How long is a year on HD 202206 c?
One orbit around HD 202206 takes 1,260.0 Earth days.
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