TOI-1448 b
Astrophysical Synthesis & Habitability Characterization
TOI-1448 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1448, located approximately 239.2 light-years (73.34 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 0.4399% across the stellar disk), this world measures 2.749 Earth radii and has a measured mass of 19.5 Earth masses. Combining its mass and radius yields a mean bulk density of 5.18 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 2.58 g⊕ (25.3 m/s²), and an escape velocity of 29.8 km/s.
In its orbital architecture around TOI-1448, TOI-1448 b completes one full revolution every 8.112 Earth days at a semi-major axis of 0.0567 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 76 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.36, swinging from 0.0363 AU at periapsis out to 0.0771 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 426 K (+153°C / +307°F) and receiving 5.45 S⊕ (~7,417 W/m²), TOI-1448 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1448 is classified as a stellar host with an effective photospheric temperature of 3,412 K, a radius of 0.38 R☉, a mass of 0.372 M☉, an estimated bolometric luminosity of 0.018 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.37 dex (metal-rich relative to the Sun). From Earth, TOI-1448 shines at apparent V-band magnitude 15.678 (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-1448 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,412 K |
| Stellar Radius | 0.3800 R☉ |
| Stellar Mass | 0.3720 M☉ |
| Bolometric Luminosity | 0.018 L☉ |
| Metallicity [Fe/H] | 0.370 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 15.678 · G: 14.401 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.056700 AU |
| Orbital Period | 8.112 days |
| Mean Orbital Velocity | 76 km/s |
| Orbital Eccentricity (e) | 0.36000 |
| Orbital Inclination (i) | 89.6200° |
| Mean Bulk Density | 5.18 g/cm³ (29.8 km/s vesc) |
| Insolation Flux | 5.4500 S⊕ (~7,417 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 239.200 LY (73.335 pc) |