TOI-913 b
Astrophysical Synthesis & Habitability Characterization
TOI-913 b is a confirmed sub-neptune exoplanet orbiting the star TOI-913, located approximately 212.6 light-years (65.18 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0943% across the stellar disk), this world measures 2.453 Earth radii and has a measured mass of 6.59 Earth masses. Combining its mass and radius yields a mean bulk density of 2.46 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 18.3 km/s.
In its orbital architecture around TOI-913, TOI-913 b completes one full revolution every 11.099 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 712 K (+439°C / +822°F) and receiving 110.06 S⊕ (~149,791 W/m²), TOI-913 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-913 is classified as a stellar host with an effective photospheric temperature of 4,969 K, a radius of 0.7325 R☉, a mass of 0.82 M☉, an estimated bolometric luminosity of 0.293 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.133 dex (metal-poor relative to the Sun). From Earth, TOI-913 shines at apparent V-band magnitude 10.452 (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-913 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,969 K |
| Stellar Radius | 0.7325 R☉ |
| Stellar Mass | 0.8200 M☉ |
| Bolometric Luminosity | 0.293 L☉ |
| Metallicity [Fe/H] | -0.133 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 10.452 · G: 10.192 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 11.099 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.1000° |
| Mean Bulk Density | 2.46 g/cm³ (18.3 km/s vesc) |
| Insolation Flux | 110.0592 S⊕ (~149,791 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 212.600 LY (65.177 pc) |