TOI-4463 A b
Astrophysical Synthesis & Habitability Characterization
TOI-4463 A b is a confirmed gas giant exoplanet orbiting the star TOI-4463 A, located approximately 564.6 light-years (173.12 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.3103% across the stellar disk), this world measures 13.26 Earth radii (1.18 Jupiter radii) and has a measured mass of 252.356 Earth masses (0.79 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.6 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.44 g⊕ (14.12 m/s²), and an escape velocity of 48.8 km/s.
In its orbital architecture around TOI-4463 A, TOI-4463 A b completes one full revolution every 2.881 Earth days at a semi-major axis of 0.04036 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 152.4 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 1395 K (+1122°C / +2052°F) and receiving 633.00 S⊕ (~861,513 W/m²), TOI-4463 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4463 A is classified as a stellar host with an effective photospheric temperature of 5,640 K, a radius of 1.062 R☉, a mass of 1.056 M☉, an estimated bolometric luminosity of 1.024 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.1 Gyr and a metallicity of [Fe/H] = 0.25 dex (metal-rich relative to the Sun). From Earth, TOI-4463 A shines at apparent V-band magnitude 11.036 (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-4463 A |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,640 K |
| Stellar Radius | 1.0620 R☉ |
| Stellar Mass | 1.0560 M☉ |
| Bolometric Luminosity | 1.024 L☉ |
| Metallicity [Fe/H] | 0.250 dex |
| Stellar Age | 4.100 Gyr |
| Apparent Magnitude | V: 11.036 · G: 10.951 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040360 AU |
| Orbital Period | 2.881 days |
| Mean Orbital Velocity | 152.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 83.8200° |
| Mean Bulk Density | 0.6 g/cm³ (48.8 km/s vesc) |
| Insolation Flux | 633.0000 S⊕ (~861,513 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 564.600 LY (173.117 pc) |