TOI-1794 b
Astrophysical Synthesis & Habitability Characterization
TOI-1794 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1794, located approximately 508.1 light-years (155.79 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 0.0527% across the stellar disk), this world measures 3.297 Earth radii (0.29 Jupiter radii) and has a measured mass of 8.7 Earth masses. Combining its mass and radius yields a mean bulk density of 1.34 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.8 g⊕ (7.85 m/s²), and an escape velocity of 18.2 km/s.
In its orbital architecture around TOI-1794, TOI-1794 b completes one full revolution every 8.766 Earth days at a semi-major axis of 0.082 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 101.8 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 993 K (+720°C / +1328°F) and receiving 228.91 S⊕ (~311,551 W/m²), TOI-1794 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1794 is classified as a stellar host with an effective photospheric temperature of 5,631 K, a radius of 1.3162 R☉, a mass of 0.9698 M☉, an estimated bolometric luminosity of 1.563 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.8 Gyr and a metallicity of [Fe/H] = 0.035 dex (near-solar heavy-element abundance). From Earth, TOI-1794 shines at apparent V-band magnitude 10.32 (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-1794 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,631 K |
| Stellar Radius | 1.3162 R☉ |
| Stellar Mass | 0.9698 M☉ |
| Bolometric Luminosity | 1.563 L☉ |
| Metallicity [Fe/H] | 0.035 dex |
| Stellar Age | 10.800 Gyr |
| Apparent Magnitude | V: 10.320 · G: 10.144 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.082000 AU |
| Orbital Period | 8.766 days |
| Mean Orbital Velocity | 101.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.6083° |
| Mean Bulk Density | 1.34 g/cm³ (18.2 km/s vesc) |
| Insolation Flux | 228.9130 S⊕ (~311,551 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 508.100 LY (155.791 pc) |