TOI-7391 b
Astrophysical Synthesis & Habitability Characterization
TOI-7391 b is a confirmed super-earth exoplanet orbiting the star TOI-7391, located approximately 238.9 light-years (73.24 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 0.1208% across the stellar disk), this world measures 1.58 Earth radii and has a measured mass of 3.12 Earth masses. Combining its mass and radius yields a mean bulk density of 4.36 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.25 g⊕ (12.26 m/s²), and an escape velocity of 15.7 km/s.
In its orbital architecture around TOI-7391, TOI-7391 b completes one full revolution every 7.411 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 433 K (+160°C / +320°F) and receiving 8.34 S⊕ (~11,347 W/m²), TOI-7391 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7391 is classified as a stellar host with an effective photospheric temperature of 3,578 K, a radius of 0.4167 R☉, a mass of 0.4102 M☉, an estimated bolometric luminosity of 0.026 L☉. From Earth, TOI-7391 shines at apparent V-band magnitude 15.02 (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-7391 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,578 K |
| Stellar Radius | 0.4167 R☉ |
| Stellar Mass | 0.4102 M☉ |
| Bolometric Luminosity | 0.026 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 15.020 · G: 13.840 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 7.411 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.36 g/cm³ (15.7 km/s vesc) |
| Insolation Flux | 8.3370 S⊕ (~11,347 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 238.900 LY (73.238 pc) |