TOI-3486 b
Astrophysical Synthesis & Habitability Characterization
TOI-3486 b is a confirmed gas giant exoplanet orbiting the star TOI-3486, located approximately 504.6 light-years (154.72 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 1.5123% across the stellar disk), this world measures 10.57 Earth radii (0.94 Jupiter radii) and has a measured mass of 99.162 Earth masses (0.31 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.46 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.89 g⊕ (8.73 m/s²), and an escape velocity of 34.3 km/s.
In its orbital architecture around TOI-3486, TOI-3486 b completes one full revolution every 2.218 Earth days at a semi-major axis of 0.03138 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 153.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.078 carries the world between 0.0289 AU at periapsis and 0.0338 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1190 K (+917°C / +1683°F) and receiving 334.00 S⊕ (~454,574 W/m²), TOI-3486 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3486 is classified as a stellar host with an effective photospheric temperature of 4,930 K, a radius of 0.788 R☉, a mass of 0.837 M☉, an estimated bolometric luminosity of 0.329 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.8 Gyr and a metallicity of [Fe/H] = 0.283 dex (metal-rich relative to the Sun). From Earth, TOI-3486 shines at apparent V-band magnitude 12.329 (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-3486 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,930 K |
| Stellar Radius | 0.7880 R☉ |
| Stellar Mass | 0.8370 M☉ |
| Bolometric Luminosity | 0.329 L☉ |
| Metallicity [Fe/H] | 0.283 dex |
| Stellar Age | 5.800 Gyr |
| Apparent Magnitude | V: 12.329 · G: 12.114 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.031380 AU |
| Orbital Period | 2.218 days |
| Mean Orbital Velocity | 153.9 km/s |
| Orbital Eccentricity (e) | 0.07800 |
| Orbital Inclination (i) | 85.2000° |
| Mean Bulk Density | 0.46 g/cm³ (34.3 km/s vesc) |
| Insolation Flux | 334.0000 S⊕ (~454,574 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 504.600 LY (154.715 pc) |