TOI-4324 b
Astrophysical Synthesis & Habitability Characterization
TOI-4324 b is a confirmed terrestrial exoplanet orbiting the star TOI-4324, located approximately 55.6 light-years (17.04 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 0.0813% across the stellar disk), this world measures 1.23 Earth radii and has a measured mass of 2.04 Earth masses. Combining its mass and radius yields a mean bulk density of 6.04 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.35 g⊕ (13.24 m/s²), and an escape velocity of 14.4 km/s.
In its orbital architecture around TOI-4324, TOI-4324 b completes one full revolution every 6.251 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 439 K (+166°C / +331°F) and receiving 8.76 S⊕ (~11,926 W/m²), TOI-4324 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4324 is classified as a low-mass red dwarf of spectral type M2.5 V with an effective photospheric temperature of 3,479 K, a radius of 0.3954 R☉, a mass of 0.3863 M☉, an estimated bolometric luminosity of 0.021 L☉. From Earth, TOI-4324 shines at apparent V-band magnitude 11.967 (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-4324 |
| Spectral Type | M2.5 V |
| Effective Temp (Teff) | 3,479 K |
| Stellar Radius | 0.3954 R☉ |
| Stellar Mass | 0.3863 M☉ |
| Bolometric Luminosity | 0.021 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 11.967 · G: 10.899 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 6.251 days |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 6.04 g/cm³ (14.4 km/s vesc) |
| Insolation Flux | 8.7624 S⊕ (~11,926 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 55.600 LY (17.038 pc) |