TOI-2328 b
Astrophysical Synthesis & Habitability Characterization
TOI-2328 b is a confirmed gas giant exoplanet orbiting the star TOI-2328, located approximately 756 light-years (231.78 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.0327% across the stellar disk), this world measures 9.976 Earth radii (0.89 Jupiter radii) and has a measured mass of 50.853 Earth masses (0.16 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.28 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.51 g⊕ (5 m/s²), and an escape velocity of 25.3 km/s.
In its orbital architecture around TOI-2328, TOI-2328 b completes one full revolution every 17.102 Earth days at a semi-major axis of 0.127 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 80.8 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.057 carries the world between 0.1198 AU at periapsis and 0.1342 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 842 K (+569°C / +1056°F) and receiving 20.10 S⊕ (~27,354 W/m²), TOI-2328 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2328 is classified as a stellar host with an effective photospheric temperature of 5,525 K, a radius of 0.9 R☉, a mass of 0.95 M☉, an estimated bolometric luminosity of 0.677 L☉. Stellar evolution modeling indicates an estimated stellar age of 4 Gyr and a metallicity of [Fe/H] = 0.09 dex (metal-rich relative to the Sun). From Earth, TOI-2328 shines at apparent V-band magnitude 12.331 (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-2328 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,525 K |
| Stellar Radius | 0.9000 R☉ |
| Stellar Mass | 0.9500 M☉ |
| Bolometric Luminosity | 0.677 L☉ |
| Metallicity [Fe/H] | 0.090 dex |
| Stellar Age | 4.000 Gyr |
| Apparent Magnitude | V: 12.331 · G: 12.108 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.127000 AU |
| Orbital Period | 17.102 days |
| Mean Orbital Velocity | 80.8 km/s |
| Orbital Eccentricity (e) | 0.05700 |
| Orbital Inclination (i) | 88.6600° |
| Mean Bulk Density | 0.28 g/cm³ (25.3 km/s vesc) |
| Insolation Flux | 20.0982 S⊕ (~27,354 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 756.000 LY (231.782 pc) |