TOI-1824 b
Astrophysical Synthesis & Habitability Characterization
TOI-1824 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1824, located approximately 193.8 light-years (59.43 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0959% across the stellar disk), this world measures 2.744 Earth radii and has a measured mass of 16 Earth masses. Combining its mass and radius yields a mean bulk density of 4.27 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 2.12 g⊕ (20.79 m/s²), and an escape velocity of 27 km/s.
In its orbital architecture around TOI-1824, TOI-1824 b completes one full revolution every 22.809 Earth days at a semi-major axis of 0.151 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 72 km/s (compared to Earth's 29.8 km/s). 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 529 K (+256°C / +493°F) and receiving 14.63 S⊕ (~19,910 W/m²), TOI-1824 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1824 is classified as a stellar host with an effective photospheric temperature of 5,165 K, a radius of 0.8123 R☉, a mass of 0.8801 M☉, an estimated bolometric luminosity of 0.421 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.5 Gyr and a metallicity of [Fe/H] = 0.124 dex (metal-rich relative to the Sun). From Earth, TOI-1824 shines at apparent V-band magnitude 9.721 (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-1824 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,165 K |
| Stellar Radius | 0.8123 R☉ |
| Stellar Mass | 0.8801 M☉ |
| Bolometric Luminosity | 0.421 L☉ |
| Metallicity [Fe/H] | 0.124 dex |
| Stellar Age | 2.500 Gyr |
| Apparent Magnitude | V: 9.721 · G: 9.508 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.151000 AU |
| Orbital Period | 22.809 days |
| Mean Orbital Velocity | 72 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.27 g/cm³ (27 km/s vesc) |
| Insolation Flux | 14.6287 S⊕ (~19,910 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 193.800 LY (59.431 pc) |