GJ 367 b
GJ 367 b is a terrestrial planet orbiting the M1.0 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 0.70 times that of Earth. Its mass is 0.63 times that of Earth, giving it a density of 10.20 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is GJ 367 b in the Habitable Zone?
GJ 367 b orbits inside the inner edge of the habitable zone of GJ 367. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of GJ 367: 0.139–0.360 AU (conservative: 0.176–0.342 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on GJ 367 b
The equilibrium temperature of GJ 367 b is about 1,365 K (1,092 °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. It receives 579 times the stellar energy that Earth gets from the Sun.
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. It orbits at an average distance of 0.007 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
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 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: GJ 367
GJ 367
- Spectral type
- M1.0 V
- Surface temperature
- 3,522 K (Sun: 5,772 K)
- Mass
- 0.46 M☉
- Radius
- 0.46 R☉
- Luminosity
- 0.0289 L☉
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 | 0.699 Earth radii (0.062 Jupiter radii) |
|---|---|
| Mass | 0.63 Earth masses (0.002 Jupiter masses) |
| Density | 10.20 g/cm³ (Earth: 5.51) |
| Orbital period | 0.32 days |
| Orbital distance | 0.007 AU |
| Eccentricity | 0.060 |
| Equilibrium temperature | 1,365 K (1,092 °C) |
| Stellar irradiation | 579.00× Earth |
| 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 2023-08-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 367 b
Is GJ 367 b habitable?
No — GJ 367 b orbits too close to its star and is too hot for liquid water to exist on its surface.
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 0.70 times the radius of Earth and about 0.63 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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