GJ 3222 b
GJ 3222 b is a Neptune-like planet orbiting GJ 3222 in the constellation Eridanus. It lies about 60 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is GJ 3222 b in the Habitable Zone?
The position of GJ 3222 b relative to the habitable zone of GJ 3222 cannot be precisely determined from the available orbital data.
Orbit and Year Length
A year on GJ 3222 b — one full orbit around GJ 3222 — lasts 10.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.091 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.93), swinging dramatically closer to and farther from its star.
How Was GJ 3222 b Discovered?
GJ 3222 b was discovered in 2022 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 GJ 3222 b?
GJ 3222 b is 59.5 light-years (18.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1967. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,047,200 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. GJ 3222 b scores 0.20, ranking #3,868 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 3222
GJ 3222 b belongs to a system of 2 stars; it orbits GJ 3222.
GJ 3222
- Mass
- 0.89 M☉
Planetary System
GJ 3222 b is the only planet known to orbit GJ 3222 so far.
GJ 3222 b — Complete Data
| Mass (best estimate) | 11.44 Earth masses |
|---|---|
| Orbital period | 10.67 days |
| Orbital distance | 0.091 AU |
| Eccentricity | 0.929 |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 59.5 light-years (18.2 parsecs) |
| Constellation | Eridanus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-06-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 3222 b
Is GJ 3222 b habitable?
GJ 3222 b is not known to orbit within the habitable zone of GJ 3222, and as a Neptune-like planet it is an unlikely candidate for life as we know it.
How far away is GJ 3222 b?
GJ 3222 b is about 60 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,047,200 years to get there.
How long is a year on GJ 3222 b?
One orbit around GJ 3222 takes 10.7 Earth days — short enough that 34 of its years would fit into one Earth year.
Explore GJ 3222 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
