TOI-206 b
Astrophysical Synthesis & Habitability Characterization
TOI-206 b is a confirmed super-earth exoplanet orbiting the star TOI-206, located approximately 155.7 light-years (47.75 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.116% across the stellar disk), this world measures 1.3 Earth radii and has a measured mass of 2.24 Earth masses. Combining its mass and radius yields a mean bulk density of 5.62 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.33 g⊕ (13.04 m/s²), and an escape velocity of 14.7 km/s.
In its orbital architecture around TOI-206, TOI-206 b completes one full revolution every 0.736 Earth days at a semi-major axis of 0.0112 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 165.5 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 910 K (+637°C / +1179°F) and receiving 117.76 S⊕ (~160,269 W/m²), TOI-206 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-206 is classified as a stellar host with an effective photospheric temperature of 3,383 K, a radius of 0.35 R☉, a mass of 0.35 M☉, an estimated bolometric luminosity of 0.014 L☉. From Earth, TOI-206 shines at apparent V-band magnitude 14.938 (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-206 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,383 K |
| Stellar Radius | 0.3500 R☉ |
| Stellar Mass | 0.3500 M☉ |
| Bolometric Luminosity | 0.014 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 14.938 · G: 13.666 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.011200 AU |
| Orbital Period | 0.736 days |
| Mean Orbital Velocity | 165.5 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 5.62 g/cm³ (14.7 km/s vesc) |
| Insolation Flux | 117.7582 S⊕ (~160,269 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 155.700 LY (47.747 pc) |