HD 222076 b
HD 222076 b is a cold gas giant orbiting the K0 III star HD 222076 in the constellation Tucana. It lies about 297 light-years from Earth and was discovered in 2016 using the radial velocity method.
Is HD 222076 b in the Habitable Zone?
HD 222076 b orbits inside the inner edge of the habitable zone of HD 222076. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 222076: 2.304–5.615 AU (conservative: 2.918–5.323 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 222076 b — one full orbit around HD 222076 — lasts 871.0 Earth days, longer than an Earth year. It orbits at an average distance of 1.830 AU. Its orbit is mildly elliptical (eccentricity 0.08).
How Was HD 222076 b Discovered?
HD 222076 b was discovered in 2016 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 HD 222076 b?
HD 222076 b is 297.3 light-years (91.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1729. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,232,480 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 222076 b scores 0.32, ranking #1,056 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 222076
HD 222076
- Spectral type
- K0 III
- Surface temperature
- 4,806 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 4.10 R☉
- Luminosity
- 8.5000 L☉
Planetary System
HD 222076 b is the only planet known to orbit HD 222076 so far.
HD 222076 b — Complete Data
| Mass (best estimate) | 495.81 Earth masses |
|---|---|
| Orbital period | 871.00 days |
| Orbital distance | 1.830 AU |
| Eccentricity | 0.080 |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 297.3 light-years (91.2 parsecs) |
| Constellation | Tucana |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2016 |
Data: NASA Exoplanet Archive, last updated 2016-11-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 222076 b
Is HD 222076 b habitable?
No — HD 222076 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 222076 b?
HD 222076 b is about 297 light-years from Earth in the constellation Tucana. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,232,480 years to get there.
How long is a year on HD 222076 b?
One orbit around HD 222076 takes 871.0 Earth days.
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