GJ 367 b
Astrophysical Synthesis & Habitability Characterization
GJ 367 b is a confirmed sub-earth exoplanet orbiting the star GJ 367, located approximately 30.7 light-years (9.41 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0218% across the stellar disk), this world measures 0.736 Earth radii and has a measured mass of 0.503 Earth masses. Combining its mass and radius yields a mean bulk density of 6.96 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 0.93 g⊕ (9.12 m/s²), and an escape velocity of 9.2 km/s.
In its orbital architecture around GJ 367, GJ 367 b completes one full revolution every 0.322 Earth days at a semi-major axis of 0.0071 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 239.9 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1329 K (+1056°C / +1933°F) and receiving 579.00 S⊕ (~788,019 W/m²), GJ 367 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star GJ 367 is classified as a low-mass red dwarf of spectral type M V with an effective photospheric temperature of 3,535 K, a radius of 0.457 R☉, a mass of 0.451 M☉, an estimated bolometric luminosity of 0.029 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, GJ 367 shines at apparent V-band magnitude 10.153 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The GJ 367 system is a multi-planet architecture hosting 3 confirmed worlds, with GJ 367 b sharing its stellar neighborhood alongside GJ 367 c, GJ 367 d.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | GJ 367 |
| Spectral Type | M V |
| Effective Temp (Teff) | 3,535 K |
| Stellar Radius | 0.4570 R☉ |
| Stellar Mass | 0.4510 M☉ |
| Bolometric Luminosity | 0.029 L☉ |
| Metallicity [Fe/H] | -0.010 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.153 · G: 9.152 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.007100 AU |
| Orbital Period | 0.322 days |
| Mean Orbital Velocity | 239.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 78.6000° |
| Mean Bulk Density | 6.96 g/cm³ (9.2 km/s vesc) |
| Insolation Flux | 579.0000 S⊕ (~788,019 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 30.700 LY (9.413 pc) |