TOI-7389 b
Astrophysical Synthesis & Habitability Characterization
TOI-7389 b is a confirmed super-earth exoplanet orbiting the star TOI-7389, located approximately 328.4 light-years (100.68 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 0.0113% across the stellar disk), this world measures 1.35 Earth radii and has a measured mass of 2.39 Earth masses. Combining its mass and radius yields a mean bulk density of 5.36 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.31 g⊕ (12.85 m/s²), and an escape velocity of 14.9 km/s.
In its orbital architecture around TOI-7389, TOI-7389 b completes one full revolution every 26.345 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 1093 K (+820°C / +1508°F) and receiving 237.78 S⊕ (~323,619 W/m²), TOI-7389 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7389 is classified as a stellar host with an effective photospheric temperature of 5,895 K, a radius of 1.1626 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 1.464 L☉. From Earth, TOI-7389 shines at apparent V-band magnitude 9.368 (accessible to binoculars and small amateur telescopes) 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-7389 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,895 K |
| Stellar Radius | 1.1626 R☉ |
| Stellar Mass | 1.0700 M☉ |
| Bolometric Luminosity | 1.464 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 9.368 · G: 9.285 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 26.345 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 5.36 g/cm³ (14.9 km/s vesc) |
| Insolation Flux | 237.7800 S⊕ (~323,619 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 328.400 LY (100.677 pc) |