TOI-762 A b
Astrophysical Synthesis & Habitability Characterization
TOI-762 A b is a confirmed gas giant exoplanet orbiting the star TOI-762 A, located approximately 321.1 light-years (98.45 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 3.2359% across the stellar disk), this world measures 8.339 Earth radii (0.74 Jupiter radii) and has a measured mass of 79.775 Earth masses (0.25 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.76 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.15 g⊕ (11.28 m/s²), and an escape velocity of 34.6 km/s.
In its orbital architecture around TOI-762 A, TOI-762 A b completes one full revolution every 3.472 Earth days at a semi-major axis of 0.03418 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 107.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.083 carries the world between 0.0313 AU at periapsis and 0.037 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 555 K (+282°C / +540°F) and receiving 17.00 S⊕ (~23,139 W/m²), TOI-762 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-762 A is classified as a stellar host with an effective photospheric temperature of 3,266 K, a radius of 0.425 R☉, a mass of 0.442 M☉, an estimated bolometric luminosity of 0.018 L☉. Stellar evolution modeling indicates an estimated stellar age of 9.3 Gyr and a metallicity of [Fe/H] = 0.357 dex (metal-rich relative to the Sun). From Earth, TOI-762 A shines at apparent V-band magnitude 16 (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-762 A |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,266 K |
| Stellar Radius | 0.4250 R☉ |
| Stellar Mass | 0.4420 M☉ |
| Bolometric Luminosity | 0.018 L☉ |
| Metallicity [Fe/H] | 0.357 dex |
| Stellar Age | 9.300 Gyr |
| Apparent Magnitude | V: 16.000 · G: 14.954 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.034180 AU |
| Orbital Period | 3.472 days |
| Mean Orbital Velocity | 107.1 km/s |
| Orbital Eccentricity (e) | 0.08300 |
| Orbital Inclination (i) | 87.5000° |
| Mean Bulk Density | 0.76 g/cm³ (34.6 km/s vesc) |
| Insolation Flux | 17.0012 S⊕ (~23,139 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 321.100 LY (98.446 pc) |