TOI-682.01
Astrophysical Synthesis & Habitability Characterization
TOI-682.01 is a confirmed sub-neptune exoplanet orbiting the star TOI-682, located approximately 271.2 light-years (83.16 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1009% across the stellar disk), this world measures 3.742 Earth radii (0.33 Jupiter radii) and has a measured mass of 13.5 Earth masses. Combining its mass and radius yields a mean bulk density of 1.42 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.96 g⊕ (9.41 m/s²), and an escape velocity of 21.2 km/s.
In its orbital architecture around TOI-682, TOI-682.01 completes one full revolution every 6.839 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1090 K (+817°C / +1503°F) and receiving 234.46 S⊕ (~319,100 W/m²), TOI-682.01 orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-682 is classified as a stellar host with an effective photospheric temperature of 5,085 K, a radius of 1.08 R☉, a mass of 0.85 M☉, an estimated bolometric luminosity of 0.7 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.27 dex (metal-rich relative to the Sun). From Earth, TOI-682 shines at apparent V-band magnitude 9.969 (accessible to binoculars and small amateur telescopes) 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-682 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,085 K |
| Stellar Radius | 1.0800 R☉ |
| Stellar Mass | 0.8500 M☉ |
| Bolometric Luminosity | 0.7 L☉ |
| Metallicity [Fe/H] | 0.270 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 9.969 · G: 9.742 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 6.839 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.42 g/cm³ (21.2 km/s vesc) |
| Insolation Flux | 234.4600 S⊕ (~319,100 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 271.200 LY (83.155 pc) |