TOI-5806 b
Astrophysical Synthesis & Habitability Characterization
TOI-5806 b is a confirmed gas giant exoplanet orbiting the star TOI-5806, located approximately 388.8 light-years (119.2 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.0004% across the stellar disk), this world measures 15.132 Earth radii (1.35 Jupiter radii) and has a measured mass of 721.47 Earth masses (2.27 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.15 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.15 g⊕ (30.89 m/s²), and an escape velocity of 77.2 km/s.
In its orbital architecture around TOI-5806, TOI-5806 b completes one full revolution every 3.186 Earth days at a semi-major axis of 0.0484 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 165.3 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1621 K (+1348°C / +2458°F) and receiving 1,660.00 S⊕ (~2,259,260 W/m²), TOI-5806 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5806 is classified as a warm F-type star of spectral type F3 V with an effective photospheric temperature of 6,730 K, a radius of 1.387 R☉, a mass of 1.333 M☉, an estimated bolometric luminosity of 3.541 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.019 dex (near-solar heavy-element abundance). From Earth, TOI-5806 shines at apparent V-band magnitude 8.703 (accessible to binoculars and small amateur telescopes) 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-5806 |
| Spectral Type | F3 V |
| Effective Temp (Teff) | 6,730 K |
| Stellar Radius | 1.3870 R☉ |
| Stellar Mass | 1.3330 M☉ |
| Bolometric Luminosity | 3.541 L☉ |
| Metallicity [Fe/H] | -0.019 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 8.703 · G: 8.610 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.048400 AU |
| Orbital Period | 3.186 days |
| Mean Orbital Velocity | 165.3 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 82.2400° |
| Mean Bulk Density | 1.15 g/cm³ (77.2 km/s vesc) |
| Insolation Flux | 1660.0000 S⊕ (~2,259,260 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 388.800 LY (119.199 pc) |