GJ 367 b
GJ 367 b is a terrestrial planet orbiting the M V star GJ 367 in the constellation Vela. It lies about 31 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is GJ 367 b?
GJ 367 b has a radius of 0.74 times that of Earth. Its mass is 0.50 times that of Earth, giving it a density of 6.90 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is GJ 367 b in the Habitable Zone?
The position of GJ 367 b relative to the habitable zone of GJ 367 cannot be precisely determined from the available orbital data.
Habitable zone of GJ 367: 0.140–0.362 AU (conservative: 0.177–0.343 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 ›
Temperature on GJ 367 b
The equilibrium temperature of GJ 367 b is about 1,329 K (1,056 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on GJ 367 b — one full orbit around GJ 367 — lasts just 7.7 hours, shorter than Mercury's 88-day year.
How Was GJ 367 b Discovered?
GJ 367 b was discovered in 2021 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is GJ 367 b?
GJ 367 b is 30.7 light-years (9.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1996. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 540,320 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 367 b scores 0.28, ranking #2,098 of 5,566 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 367
GJ 367
- Spectral type
- M V
- Surface temperature
- 3,535 K (Sun: 5,772 K)
- Mass
- 0.45 M☉
- Radius
- 0.46 R☉
The GJ 367 Planetary System
GJ 367 b is one of 3 known planets in the GJ 367 system. Its siblings:
GJ 367 b — Complete Data
| Radius | 0.736 Earth radii (0.066 Jupiter radii) |
|---|---|
| Mass | 0.50 Earth masses (0.002 Jupiter masses) |
| Density | 6.90 g/cm³ (Earth: 5.51) |
| Orbital period | 0.32 days |
| Equilibrium temperature | 1,329 K (1,056 °C) |
| Earth Similarity Index | 0.28 |
| Distance from Earth | 30.7 light-years (9.4 parsecs) |
| Constellation | Vela |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2026-07-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 367 b
Is GJ 367 b habitable?
GJ 367 b is not known to orbit within the habitable zone of GJ 367, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is GJ 367 b?
GJ 367 b is about 31 light-years from Earth in the constellation Vela. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 540,320 years to get there.
How big is GJ 367 b compared to Earth?
GJ 367 b has 0.74 times the radius of Earth and about 0.50 times its mass.
How long is a year on GJ 367 b?
One orbit around GJ 367 takes 0.3 Earth days — short enough that 1,135 of its years would fit into one Earth year.
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