TOI-6393 b
Astrophysical Synthesis & Habitability Characterization
TOI-6393 b is a confirmed sub-neptune exoplanet orbiting the star TOI-6393, located approximately 607.4 light-years (186.23 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 0.1091% across the stellar disk), this world measures 2.76 Earth radii and has a measured mass of 8.04 Earth masses. Combining its mass and radius yields a mean bulk density of 2.11 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.06 g⊕ (10.4 m/s²), and an escape velocity of 19.1 km/s.
In its orbital architecture around TOI-6393, TOI-6393 b completes one full revolution every 9.532 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 696 K (+423°C / +793°F) and receiving 39.07 S⊕ (~53,171 W/m²), TOI-6393 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6393 is classified as a stellar host with an effective photospheric temperature of 5,008 K, a radius of 0.766 R☉, a mass of 0.835 M☉, an estimated bolometric luminosity of 0.331 L☉. From Earth, TOI-6393 shines at apparent V-band magnitude 12.513 (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-6393 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,008 K |
| Stellar Radius | 0.7660 R☉ |
| Stellar Mass | 0.8350 M☉ |
| Bolometric Luminosity | 0.331 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 12.513 · G: 12.352 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 9.532 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.4902° |
| Mean Bulk Density | 2.11 g/cm³ (19.1 km/s vesc) |
| Insolation Flux | 39.0679 S⊕ (~53,171 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 607.400 LY (186.229 pc) |