TOI-2368 b
Astrophysical Synthesis & Habitability Characterization
TOI-2368 b is a confirmed gas giant exoplanet orbiting the star TOI-2368, located approximately 687.9 light-years (210.92 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 1.3797% across the stellar disk), this world measures 10.839 Earth radii (0.97 Jupiter radii) and has a measured mass of 206.588 Earth masses (0.65 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.89 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.76 g⊕ (17.26 m/s²), and an escape velocity of 48.8 km/s.
In its orbital architecture around TOI-2368, TOI-2368 b completes one full revolution every 5.175 Earth days at a semi-major axis of 0.05649 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 118.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.061 carries the world between 0.053 AU at periapsis and 0.0599 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1000 K (+727°C / +1341°F) and receiving 162.73 S⊕ (~221,471 W/m²), TOI-2368 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2368 is classified as a stellar host with an effective photospheric temperature of 5,360 K, a radius of 0.846 R☉, a mass of 0.897 M☉, an estimated bolometric luminosity of 0.53 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.2 Gyr and a metallicity of [Fe/H] = 0.1 dex (metal-rich relative to the Sun). From Earth, TOI-2368 shines at apparent V-band magnitude 12.486 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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-2368 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,360 K |
| Stellar Radius | 0.8460 R☉ |
| Stellar Mass | 0.8970 M☉ |
| Bolometric Luminosity | 0.53 L☉ |
| Metallicity [Fe/H] | 0.100 dex |
| Stellar Age | 4.200 Gyr |
| Apparent Magnitude | V: 12.486 · G: 12.273 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.056490 AU |
| Orbital Period | 5.175 days |
| Mean Orbital Velocity | 118.8 km/s |
| Orbital Eccentricity (e) | 0.06100 |
| Orbital Inclination (i) | 86.6100° |
| Mean Bulk Density | 0.89 g/cm³ (48.8 km/s vesc) |
| Insolation Flux | 162.7267 S⊕ (~221,471 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 687.900 LY (210.915 pc) |