NASA (Exoplanet Catalog artwork)Gliese 367 b
also named TahayAn iron cannonball of a planet that circles its star in less than 8 hours
Overview
Gliese 367 b, formally named Tahay, is a sub-Earth exoplanet orbiting the red dwarf star Gliese 367, 30.7 light-years from Earth in the constellation of Vela. The exoplanet takes just 7.7 hours to orbit its star, one of the shortest orbits of any planet.
Source: Wikipedia
NASA: GJ 367 b is a terrestrial exoplanet that orbits a M-type star. Its mass is 0.503 Earths, it takes 0.3 days to complete one orbit of its star, and is 0.0071 AU from its star. Its discovery was announced in 2021.
Why it matters
- Smaller than Earth, with a density suggesting an iron core making up most of the planet.
- Its 7.7-hour orbit keeps the dayside around 1,500 °C.
- A possible remnant core of a larger world stripped of its mantle.
NASA puts it this way: “GJ 367 b is a terrestrial exoplanet that orbits an M-type star. Its mass is 0.633 Earths, it takes 0.3 days to complete one orbit of its star, and is 0.00709 AU from its star. Its discovery was announced in 2021.”
Discovery & system
- Discovered
- 2021 · Transit · Transiting Exoplanet Survey Satellite (TESS)
- Discovery paper
- Lam et al. 2021
- Host star
- GJ 367 · M V · 3,535 K · 0.45 M☉
- System
- 3 known planets
- Siblings
- GJ 367 c, GJ 367 d
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| GJ 367 b | 7.7 h | 0.0071 AU | 0.74 R⊕ | 0.5 M⊕ | 1,329 K |
| GJ 367 c | 11.5 d | 0.077 AU | 1.86 R⊕ | ≥ 4.13 M⊕ | — |
| GJ 367 d | 34.4 d | 0.159 AU | 2.33 R⊕ | ≥ 6.03 M⊕ | — |
By the numbers
- Radius
- 0.74 R⊕4,689 km
- Mass
- 0.5 M⊕3 ×10²⁴ kg
- Orbital period
- 7.7 h
- Distance from star
- 0.0071 AU1.06 million km
- Eccentricity
- 0nearly circular
- Equilibrium temp.
- 1,329 K1,056 °C
- Starlight received
- 579 × Earth
- Distance from Earth
- 30.7 ly9.4 pc
- Density
- 6.9 g/cm³1.25 × Earth
Sources
Image: NASA (Exoplanet Catalog artwork) · NASA media: generally free of copyright · image page
Text: Wikipedia (CC BY-SA 4.0). Taglines and highlights are editorial.