TOI-7384 b
Astrophysical Synthesis & Habitability Characterization
TOI-7384 b is a confirmed sub-neptune exoplanet orbiting the star TOI-7384, located approximately 217.8 light-years (66.79 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 1.0468% across the stellar disk), this world measures 3.56 Earth radii (0.32 Jupiter radii) and has a measured mass of 12.4 Earth masses. Combining its mass and radius yields a mean bulk density of 1.52 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.98 g⊕ (9.61 m/s²), and an escape velocity of 20.9 km/s.
In its orbital architecture around TOI-7384, TOI-7384 b completes one full revolution every 6.234 Earth days at a semi-major axis of 0.0439 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 76.6 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.4, swinging from 0.0263 AU at periapsis out to 0.0615 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 378 K (+105°C / +221°F) and receiving 4.90 S⊕ (~6,669 W/m²), TOI-7384 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7384 is classified as a low-mass red dwarf of spectral type M4 with an effective photospheric temperature of 3,185 K, a radius of 0.319 R☉, a mass of 0.318 M☉, an estimated bolometric luminosity of 0.00940 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, TOI-7384 shines at apparent V-band magnitude 16.704 (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-7384 |
| Spectral Type | M4 |
| Effective Temp (Teff) | 3,185 K |
| Stellar Radius | 0.3190 R☉ |
| Stellar Mass | 0.3180 M☉ |
| Bolometric Luminosity | 0.00940 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 16.704 · G: 15.046 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.043900 AU |
| Orbital Period | 6.234 days |
| Mean Orbital Velocity | 76.6 km/s |
| Orbital Eccentricity (e) | 0.40000 |
| Orbital Inclination (i) | 88.7900° |
| Mean Bulk Density | 1.52 g/cm³ (20.9 km/s vesc) |
| Insolation Flux | 4.9000 S⊕ (~6,669 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 217.800 LY (66.790 pc) |