TIC 393818343 b
Astrophysical Synthesis & Habitability Characterization
TIC 393818343 b is a confirmed gas giant exoplanet orbiting the star TIC 393818343, located approximately 305.7 light-years (93.74 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 1.0579% across the stellar disk), this world measures 12.184 Earth radii (1.09 Jupiter radii) and has a measured mass of 1379.375 Earth masses (4.34 Jupiter masses). Combining its mass and radius yields a mean bulk density of 4.21 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 9.29 g⊕ (91.1 m/s²), and an escape velocity of 119 km/s.
In its orbital architecture around TIC 393818343, TIC 393818343 b completes one full revolution every 16.249 Earth days at a semi-major axis of 0.1291 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 86.4 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.6058, swinging from 0.0509 AU at periapsis out to 0.2073 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 806 K (+533°C / +991°F) and receiving 2.28 S⊕ (~3,103 W/m²), TIC 393818343 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TIC 393818343 is classified as a solar-type yellow star of spectral type G0 with an effective photospheric temperature of 5,756 K, a radius of 1.086 R☉, a mass of 1.082 M☉, an estimated bolometric luminosity of 1.162 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.8 Gyr and a metallicity of [Fe/H] = 0.318 dex (metal-rich relative to the Sun). From Earth, TIC 393818343 shines at apparent V-band magnitude 9.48 (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 | TIC 393818343 |
| Spectral Type | G0 |
| Effective Temp (Teff) | 5,756 K |
| Stellar Radius | 1.0860 R☉ |
| Stellar Mass | 1.0820 M☉ |
| Bolometric Luminosity | 1.162 L☉ |
| Metallicity [Fe/H] | 0.318 dex |
| Stellar Age | 3.800 Gyr |
| Apparent Magnitude | V: 9.480 · G: 9.429 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.129100 AU |
| Orbital Period | 16.249 days |
| Mean Orbital Velocity | 86.4 km/s |
| Orbital Eccentricity (e) | 0.60580 |
| Orbital Inclination (i) | 89.5700° |
| Mean Bulk Density | 4.21 g/cm³ (119 km/s vesc) |
| Insolation Flux | 2.2800 S⊕ (~3,103 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 305.700 LY (93.735 pc) |