TOI-6448 b
Astrophysical Synthesis & Habitability Characterization
TOI-6448 b is a confirmed gas giant exoplanet orbiting the star TOI-6448, located approximately 1261.8 light-years (386.88 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.7501% across the stellar disk), this world measures 8.474 Earth radii (0.76 Jupiter radii) and has a measured mass of 54 Earth masses (0.17 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.49 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.75 g⊕ (7.35 m/s²), and an escape velocity of 28.2 km/s.
In its orbital architecture around TOI-6448, TOI-6448 b completes one full revolution every 14.844 Earth days at a semi-major axis of 0.131 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 96 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.2 carries the world between 0.1048 AU at periapsis and 0.1572 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 745 K (+472°C / +882°F) and receiving 28.12 S⊕ (~38,265 W/m²), TOI-6448 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-6448 is classified as a stellar host with an effective photospheric temperature of 5,910 K, a radius of 0.897 R☉, a mass of 1.03 M☉, an estimated bolometric luminosity of 0.881 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.034 Gyr. From Earth, TOI-6448 shines at apparent V-band magnitude 12.886 (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-6448 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,910 K |
| Stellar Radius | 0.8970 R☉ |
| Stellar Mass | 1.0300 M☉ |
| Bolometric Luminosity | 0.881 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.034 Gyr |
| Apparent Magnitude | V: 12.886 · G: 12.778 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.131000 AU |
| Orbital Period | 14.844 days |
| Mean Orbital Velocity | 96 km/s |
| Orbital Eccentricity (e) | 0.20000 |
| Orbital Inclination (i) | 88.9500° |
| Mean Bulk Density | 0.49 g/cm³ (28.2 km/s vesc) |
| Insolation Flux | 28.1152 S⊕ (~38,265 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1261.800 LY (386.879 pc) |