TOI-3912 b
Astrophysical Synthesis & Habitability Characterization
TOI-3912 b is a confirmed gas giant exoplanet orbiting the star TOI-3912, located approximately 1519.9 light-years (465.99 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 0.8845% across the stellar disk), this world measures 14.28 Earth radii (1.27 Jupiter radii) and has a measured mass of 129.038 Earth masses (0.41 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.24 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.63 g⊕ (6.18 m/s²), and an escape velocity of 33.6 km/s.
In its orbital architecture around TOI-3912, TOI-3912 b completes one full revolution every 3.494 Earth days at a semi-major axis of 0.0463 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 144.2 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 1512 K (+1239°C / +2262°F) and receiving 872.20 S⊕ (~1,187,064 W/m²), TOI-3912 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3912 is classified as a stellar host with an effective photospheric temperature of 5,725 K, a radius of 1.392 R☉, a mass of 1.088 M☉, an estimated bolometric luminosity of 1.868 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.5 Gyr and a metallicity of [Fe/H] = 0.187 dex (metal-rich relative to the Sun). From Earth, TOI-3912 shines at apparent V-band magnitude 12.507 (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-3912 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,725 K |
| Stellar Radius | 1.3920 R☉ |
| Stellar Mass | 1.0880 M☉ |
| Bolometric Luminosity | 1.868 L☉ |
| Metallicity [Fe/H] | 0.187 dex |
| Stellar Age | 7.500 Gyr |
| Apparent Magnitude | V: 12.507 · G: 12.307 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.046300 AU |
| Orbital Period | 3.494 days |
| Mean Orbital Velocity | 144.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 85.6400° |
| Mean Bulk Density | 0.24 g/cm³ (33.6 km/s vesc) |
| Insolation Flux | 872.2000 S⊕ (~1,187,064 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1519.900 LY (465.992 pc) |