TOI-3682 b
Astrophysical Synthesis & Habitability Characterization
TOI-3682 b is a confirmed gas giant exoplanet orbiting the star TOI-3682, located approximately 1318.4 light-years (404.21 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 0.4575% across the stellar disk), this world measures 12.801 Earth radii (1.14 Jupiter radii) and has a measured mass of 69.287 Earth masses (0.22 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.18 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.42 g⊕ (4.12 m/s²), and an escape velocity of 26 km/s.
In its orbital architecture around TOI-3682, TOI-3682 b completes one full revolution every 3.346 Earth days at a semi-major axis of 0.048 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 156.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.22 carries the world between 0.0374 AU at periapsis and 0.0586 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1657 K (+1384°C / +2523°F) and receiving 1,258.00 S⊕ (~1,712,138 W/m²), TOI-3682 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3682 is classified as a stellar host with an effective photospheric temperature of 5,703 K, a radius of 1.735 R☉, a mass of 1.32 M☉, an estimated bolometric luminosity of 2.857 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.2 Gyr and a metallicity of [Fe/H] = 0.416 dex (metal-rich relative to the Sun). From Earth, TOI-3682 shines at apparent V-band magnitude 11.678 (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-3682 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,703 K |
| Stellar Radius | 1.7350 R☉ |
| Stellar Mass | 1.3200 M☉ |
| Bolometric Luminosity | 2.857 L☉ |
| Metallicity [Fe/H] | 0.416 dex |
| Stellar Age | 4.200 Gyr |
| Apparent Magnitude | V: 11.678 · G: 11.875 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.048000 AU |
| Orbital Period | 3.346 days |
| Mean Orbital Velocity | 156.1 km/s |
| Orbital Eccentricity (e) | 0.22000 |
| Orbital Inclination (i) | 85.5100° |
| Mean Bulk Density | 0.18 g/cm³ (26 km/s vesc) |
| Insolation Flux | 1258.0000 S⊕ (~1,712,138 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1318.400 LY (404.211 pc) |