TOI-2266 b
Astrophysical Synthesis & Habitability Characterization
TOI-2266 b is a confirmed super-earth exoplanet orbiting the star TOI-2266, located approximately 168.3 light-years (51.6 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 0.3461% across the stellar disk), this world measures 1.54 Earth radii and has a measured mass of 2.99 Earth masses. Combining its mass and radius yields a mean bulk density of 4.51 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.26 g⊕ (12.36 m/s²), and an escape velocity of 15.6 km/s.
In its orbital architecture around TOI-2266, TOI-2266 b completes one full revolution every 2.326 Earth days at a semi-major axis of 0.02 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 93.5 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 550 K (+277°C / +531°F) and receiving 13.00 S⊕ (~17,693 W/m²), TOI-2266 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2266 is classified as a low-mass red dwarf of spectral type M5.0+0.5-0.5 with an effective photospheric temperature of 3,200 K, a radius of 0.24 R☉, a mass of 0.23 M☉, an estimated bolometric luminosity of 0.00542 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.3 Gyr. From Earth, TOI-2266 shines at apparent V-band magnitude 16.54 (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-2266 |
| Spectral Type | M5.0+0.5-0.5 |
| Effective Temp (Teff) | 3,200 K |
| Stellar Radius | 0.2400 R☉ |
| Stellar Mass | 0.2300 M☉ |
| Bolometric Luminosity | 0.00542 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.300 Gyr |
| Apparent Magnitude | V: 16.540 · G: 14.832 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.020000 AU |
| Orbital Period | 2.326 days |
| Mean Orbital Velocity | 93.5 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.5100° |
| Mean Bulk Density | 4.51 g/cm³ (15.6 km/s vesc) |
| Insolation Flux | 13.0000 S⊕ (~17,693 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 168.300 LY (51.600 pc) |