TOI-2373 b
Astrophysical Synthesis & Habitability Characterization
TOI-2373 b is a confirmed gas giant exoplanet orbiting the star TOI-2373, located approximately 1659.1 light-years (508.69 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.7521% across the stellar disk), this world measures 10.424 Earth radii (0.93 Jupiter radii) and has a measured mass of 2955.804 Earth masses (9.3 Jupiter masses). Combining its mass and radius yields a mean bulk density of 14.39 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 27.2 g⊕ (266.74 m/s²), and an escape velocity of 188.4 km/s.
In its orbital architecture around TOI-2373, TOI-2373 b completes one full revolution every 13.337 Earth days at a semi-major axis of 0.112 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 91.4 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.112 carries the world between 0.0995 AU at periapsis and 0.1245 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 860 K (+587°C / +1089°F) and receiving 69.87 S⊕ (~95,097 W/m²), TOI-2373 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2373 is classified as a stellar host with an effective photospheric temperature of 5,651 K, a radius of 1.102 R☉, a mass of 1.041 M☉, an estimated bolometric luminosity of 1.111 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.9 Gyr and a metallicity of [Fe/H] = 0.3 dex (metal-rich relative to the Sun). From Earth, TOI-2373 shines at apparent V-band magnitude 13.251 (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-2373 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,651 K |
| Stellar Radius | 1.1020 R☉ |
| Stellar Mass | 1.0410 M☉ |
| Bolometric Luminosity | 1.111 L☉ |
| Metallicity [Fe/H] | 0.300 dex |
| Stellar Age | 5.900 Gyr |
| Apparent Magnitude | V: 13.251 · G: 13.071 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.112000 AU |
| Orbital Period | 13.337 days |
| Mean Orbital Velocity | 91.4 km/s |
| Orbital Eccentricity (e) | 0.11200 |
| Orbital Inclination (i) | 89.2000° |
| Mean Bulk Density | 14.39 g/cm³ (188.4 km/s vesc) |
| Insolation Flux | 69.8726 S⊕ (~95,097 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1659.100 LY (508.686 pc) |