TOI-6383 A b
Astrophysical Synthesis & Habitability Characterization
TOI-6383 A b is a confirmed gas giant exoplanet orbiting the star TOI-6383 A, located approximately 558.8 light-years (171.32 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 5.1298% across the stellar disk), this world measures 11.29 Earth radii (1.01 Jupiter radii) and has a measured mass of 331 Earth masses (1.04 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.27 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.6 g⊕ (25.5 m/s²), and an escape velocity of 60.6 km/s.
In its orbital architecture around TOI-6383 A, TOI-6383 A b completes one full revolution every 1.791 Earth days at a semi-major axis of 0.02292 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 139.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.05 carries the world between 0.0218 AU at periapsis and 0.0241 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 745 K (+472°C / +882°F) and receiving 51.30 S⊕ (~69,819 W/m²), TOI-6383 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6383 A is classified as a low-mass red dwarf of spectral type M3 with an effective photospheric temperature of 3,444 K, a radius of 0.457 R☉, a mass of 0.458 M☉, an estimated bolometric luminosity of 0.026 L☉. From Earth, TOI-6383 A shines at apparent V-band magnitude 16.63 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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 | TOI-6383 A |
| Spectral Type | M3 |
| Effective Temp (Teff) | 3,444 K |
| Stellar Radius | 0.4570 R☉ |
| Stellar Mass | 0.4580 M☉ |
| Bolometric Luminosity | 0.026 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 16.630 · G: 15.663 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.022920 AU |
| Orbital Period | 1.791 days |
| Mean Orbital Velocity | 139.3 km/s |
| Orbital Eccentricity (e) | 0.05000 |
| Orbital Inclination (i) | 88.8000° |
| Mean Bulk Density | 1.27 g/cm³ (60.6 km/s vesc) |
| Insolation Flux | 51.3000 S⊕ (~69,819 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 558.800 LY (171.319 pc) |