TOI-4794 b
Astrophysical Synthesis & Habitability Characterization
TOI-4794 b is a confirmed gas giant exoplanet orbiting the star TOI-4794, located approximately 1771.1 light-years (543.01 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 0.8231% across the stellar disk), this world measures 14.359 Earth radii (1.28 Jupiter radii) and has a measured mass of 308.294 Earth masses (0.97 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.57 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.5 g⊕ (14.71 m/s²), and an escape velocity of 51.8 km/s.
In its orbital architecture around TOI-4794, TOI-4794 b completes one full revolution every 3.566 Earth days at a semi-major axis of 0.0492 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 150.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.1 carries the world between 0.0443 AU at periapsis and 0.0541 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1673 K (+1400°C / +2552°F) and receiving 1,310.00 S⊕ (~1,782,910 W/m²), TOI-4794 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4794 is classified as a stellar host with an effective photospheric temperature of 6,390 K, a radius of 1.451 R☉, a mass of 1.25 M☉, an estimated bolometric luminosity of 3.149 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.7 Gyr and a metallicity of [Fe/H] = -0.102 dex (metal-poor relative to the Sun). From Earth, TOI-4794 shines at apparent V-band magnitude 12.563 (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-4794 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,390 K |
| Stellar Radius | 1.4510 R☉ |
| Stellar Mass | 1.2500 M☉ |
| Bolometric Luminosity | 3.149 L☉ |
| Metallicity [Fe/H] | -0.102 dex |
| Stellar Age | 2.700 Gyr |
| Apparent Magnitude | V: 12.563 · G: 12.450 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.049200 AU |
| Orbital Period | 3.566 days |
| Mean Orbital Velocity | 150.1 km/s |
| Orbital Eccentricity (e) | 0.10000 |
| Orbital Inclination (i) | 88.6000° |
| Mean Bulk Density | 0.57 g/cm³ (51.8 km/s vesc) |
| Insolation Flux | 1310.0000 S⊕ (~1,782,910 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1771.100 LY (543.008 pc) |