HD 142022 A b
HD 142022 A b is a cold gas giant orbiting HD 142022 A in the constellation Octans. It lies about 112 light-years from Earth and was discovered in 2005 using the radial velocity method.
Is HD 142022 A b in the Habitable Zone?
HD 142022 A b orbits beyond the outer edge of the habitable zone of HD 142022 A. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 142022 A: 0.701–1.670 AU (conservative: 0.889–1.584 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 142022 A b — one full orbit around HD 142022 A — lasts 1,928.0 Earth days, longer than an Earth year. It orbits at an average distance of 2.930 AU. Its orbit is highly elliptical (eccentricity 0.53), swinging dramatically closer to and farther from its star.
How Was HD 142022 A b Discovered?
HD 142022 A b was discovered in 2005 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 142022 A b?
HD 142022 A b is 111.8 light-years (34.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1915. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,967,680 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 142022 A b scores 0.19, ranking #3,951 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 142022 A
HD 142022 A b belongs to a system of 2 stars; it orbits HD 142022 A.
HD 142022 A
- Surface temperature
- 5,421 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 1.04 R☉
Planetary System
HD 142022 A b is the only planet known to orbit HD 142022 A so far.
HD 142022 A b — Complete Data
| Mass (best estimate) | 1,411.17 Earth masses |
|---|---|
| Orbital period | 1,928.00 days |
| Orbital distance | 2.930 AU |
| Eccentricity | 0.530 |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 111.8 light-years (34.3 parsecs) |
| Constellation | Octans |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2005 |
Data: NASA Exoplanet Archive, last updated 2018-09-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 142022 A b
Is HD 142022 A b habitable?
No — HD 142022 A b orbits outside the habitable zone of HD 142022 A and is likely too cold for liquid water on its surface.
How far away is HD 142022 A b?
HD 142022 A b is about 112 light-years from Earth in the constellation Octans. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,967,680 years to get there.
How long is a year on HD 142022 A b?
One orbit around HD 142022 A takes 1,928.0 Earth days.
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