TOI-2227 b
Astrophysical Synthesis & Habitability Characterization
TOI-2227 b is a confirmed sub-neptune exoplanet orbiting the star TOI-2227, located approximately 539.6 light-years (165.44 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 0.0553% across the stellar disk), this world measures 3.099 Earth radii (0.28 Jupiter radii) and has a measured mass of 9.79 Earth masses. Combining its mass and radius yields a mean bulk density of 1.81 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.02 g⊕ (10 m/s²), and an escape velocity of 19.9 km/s.
In its orbital architecture around TOI-2227, TOI-2227 b completes one full revolution every 4.222 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1540 K (+1267°C / +2313°F) and receiving 933.41 S⊕ (~1,270,366 W/m²), TOI-2227 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2227 is classified as a stellar host with an effective photospheric temperature of 5,890 K, a radius of 1.2085 R☉, a mass of 1.03 M☉, an estimated bolometric luminosity of 1.577 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.05 dex (near-solar heavy-element abundance). From Earth, TOI-2227 shines at apparent V-band magnitude 10.515 (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-2227 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,890 K |
| Stellar Radius | 1.2085 R☉ |
| Stellar Mass | 1.0300 M☉ |
| Bolometric Luminosity | 1.577 L☉ |
| Metallicity [Fe/H] | -0.050 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.515 · G: 10.414 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 4.222 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.5282° |
| Mean Bulk Density | 1.81 g/cm³ (19.9 km/s vesc) |
| Insolation Flux | 933.4062 S⊕ (~1,270,366 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 539.600 LY (165.441 pc) |