HIP 34222 b
HIP 34222 b is a cold gas giant orbiting the K7 V star HIP 34222 in the constellation Gemini. It lies about 75 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HIP 34222 b in the Habitable Zone?
The position of HIP 34222 b relative to the habitable zone of HIP 34222 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on HIP 34222 b — one full orbit around HIP 34222 — lasts 160.0 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.492 AU — comparable to the inner Solar System. Its orbit is highly elliptical (eccentricity 0.31), swinging dramatically closer to and farther from its star.
How Was HIP 34222 b Discovered?
HIP 34222 b was discovered in 2021 using the radial velocity method, with observations from Cerro Tololo Inter-American 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 HIP 34222 b?
HIP 34222 b is 74.5 light-years (22.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1952. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,311,200 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. HIP 34222 b scores 0.32, ranking #1,049 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HIP 34222
HIP 34222
- Spectral type
- K7 V
- Mass
- 0.62 M☉
Planetary System
HIP 34222 b is the only planet known to orbit HIP 34222 so far.
HIP 34222 b — Complete Data
| Mass (best estimate) | 263.80 Earth masses |
|---|---|
| Orbital period | 159.99 days |
| Orbital distance | 0.492 AU |
| Eccentricity | 0.305 |
| Earth Similarity Index | 0.32 |
| Distance from Earth | 74.5 light-years (22.8 parsecs) |
| Constellation | Gemini |
| Discovery method | Radial Velocity |
| Discovery facility | Cerro Tololo Inter-American Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-01-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HIP 34222 b
Is HIP 34222 b habitable?
HIP 34222 b is not known to orbit within the habitable zone of HIP 34222, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is HIP 34222 b?
HIP 34222 b is about 75 light-years from Earth in the constellation Gemini. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,311,200 years to get there.
How long is a year on HIP 34222 b?
One orbit around HIP 34222 takes 160.0 Earth days.
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