TOI-786 b
Astrophysical Synthesis & Habitability Characterization
TOI-786 b is a confirmed sub-neptune exoplanet orbiting the star TOI-786, located approximately 547.8 light-years (167.95 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 0.0283% across the stellar disk), this world measures 2.41 Earth radii and has a measured mass of 6.39 Earth masses. Combining its mass and radius yields a mean bulk density of 2.52 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.1 g⊕ (10.79 m/s²), and an escape velocity of 18.2 km/s.
In its orbital architecture around TOI-786, TOI-786 b completes one full revolution every 12.669 Earth days. 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 1172 K (+899°C / +1650°F) and receiving 313.34 S⊕ (~426,459 W/m²), TOI-786 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-786 is classified as a stellar host with an effective photospheric temperature of 5,854 K, a radius of 1.3143 R☉, a mass of 1.06 M☉, an estimated bolometric luminosity of 1.82 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.008 dex (near-solar heavy-element abundance). From Earth, TOI-786 shines at apparent V-band magnitude 10.349 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-786 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-786 b sharing its stellar neighborhood alongside TOI-786 c.
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-786 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,854 K |
| Stellar Radius | 1.3143 R☉ |
| Stellar Mass | 1.0600 M☉ |
| Bolometric Luminosity | 1.82 L☉ |
| Metallicity [Fe/H] | -0.008 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.349 · G: 10.218 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 12.669 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.52 g/cm³ (18.2 km/s vesc) |
| Insolation Flux | 313.3423 S⊕ (~426,459 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 547.800 LY (167.948 pc) |