TOI-6255 b
Astrophysical Synthesis & Habitability Characterization
TOI-6255 b is a confirmed terrestrial exoplanet orbiting the star TOI-6255, located approximately 66.3 light-years (20.32 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 0.0715% across the stellar disk), this world measures 1.079 Earth radii and has a measured mass of 1.44 Earth masses. Combining its mass and radius yields a mean bulk density of 6.32 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 12.9 km/s.
In its orbital architecture around TOI-6255, TOI-6255 b completes one full revolution every 0.238 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 1256 K (+983°C / +1801°F) and receiving 588.99 S⊕ (~801,621 W/m²), TOI-6255 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6255 is classified as a stellar host with an effective photospheric temperature of 3,421 K, a radius of 0.37 R☉, a mass of 0.353 M☉, an estimated bolometric luminosity of 0.017 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.14 dex (metal-poor relative to the Sun). From Earth, TOI-6255 shines at apparent V-band magnitude 12.747 (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-6255 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,421 K |
| Stellar Radius | 0.3700 R☉ |
| Stellar Mass | 0.3530 M☉ |
| Bolometric Luminosity | 0.017 L☉ |
| Metallicity [Fe/H] | -0.140 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 12.747 · G: 11.635 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 0.238 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 74.4000° |
| Mean Bulk Density | 6.32 g/cm³ (12.9 km/s vesc) |
| Insolation Flux | 588.9944 S⊕ (~801,621 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 66.300 LY (20.317 pc) |