TOI-4153 b
Astrophysical Synthesis & Habitability Characterization
TOI-4153 b is a confirmed gas giant exoplanet orbiting the star TOI-4153, located approximately 1382.4 light-years (423.84 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 0.8477% across the stellar disk), this world measures 16.119 Earth radii (1.44 Jupiter radii) and has a measured mass of 365.503 Earth masses (1.15 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.48 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.41 g⊕ (13.83 m/s²), and an escape velocity of 53.3 km/s.
In its orbital architecture around TOI-4153, TOI-4153 b completes one full revolution every 4.617 Earth days at a semi-major axis of 0.06311 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 148.7 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.039 (ranging from 0.0606 AU at periapsis to 0.0656 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1669 K (+1396°C / +2545°F) and receiving 1,212.01 S⊕ (~1,649,542 W/m²), TOI-4153 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4153 is classified as a stellar host with an effective photospheric temperature of 6,860 K, a radius of 1.605 R☉, a mass of 1.572 M☉, an estimated bolometric luminosity of 5.118 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.4 Gyr and a metallicity of [Fe/H] = 0.317 dex (metal-rich relative to the Sun). From Earth, TOI-4153 shines at apparent V-band magnitude 11.601 (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-4153 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,860 K |
| Stellar Radius | 1.6050 R☉ |
| Stellar Mass | 1.5720 M☉ |
| Bolometric Luminosity | 5.118 L☉ |
| Metallicity [Fe/H] | 0.317 dex |
| Stellar Age | 0.400 Gyr |
| Apparent Magnitude | V: 11.601 · G: 11.563 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.063110 AU |
| Orbital Period | 4.617 days |
| Mean Orbital Velocity | 148.7 km/s |
| Orbital Eccentricity (e) | 0.03900 |
| Orbital Inclination (i) | 88.7500° |
| Mean Bulk Density | 0.48 g/cm³ (53.3 km/s vesc) |
| Insolation Flux | 1212.0072 S⊕ (~1,649,542 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1382.400 LY (423.840 pc) |