TOI-1248 b
Astrophysical Synthesis & Habitability Characterization
TOI-1248 b is a confirmed gas giant exoplanet orbiting the star TOI-1248, located approximately 550.3 light-years (168.74 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 0.5163% across the stellar disk), this world measures 6.808 Earth radii (0.61 Jupiter radii) and has a measured mass of 27.4 Earth 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 0.59 g⊕ (5.79 m/s²), and an escape velocity of 22.4 km/s.
In its orbital architecture around TOI-1248, TOI-1248 b completes one full revolution every 4.36 Earth days at a semi-major axis of 0.051 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 127.3 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 952 K (+679°C / +1254°F) and receiving 202.07 S⊕ (~275,023 W/m²), TOI-1248 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1248 is classified as a stellar host with an effective photospheric temperature of 5,205 K, a radius of 0.8686 R☉, a mass of 0.9042 M☉, an estimated bolometric luminosity of 0.497 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.5 Gyr and a metallicity of [Fe/H] = 0.223 dex (metal-rich relative to the Sun). From Earth, TOI-1248 shines at apparent V-band magnitude 11.806 (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-1248 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,205 K |
| Stellar Radius | 0.8686 R☉ |
| Stellar Mass | 0.9042 M☉ |
| Bolometric Luminosity | 0.497 L☉ |
| Metallicity [Fe/H] | 0.223 dex |
| Stellar Age | 5.500 Gyr |
| Apparent Magnitude | V: 11.806 · G: 11.651 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.051000 AU |
| Orbital Period | 4.36 days |
| Mean Orbital Velocity | 127.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.48 g/cm³ (22.4 km/s vesc) |
| Insolation Flux | 202.0739 S⊕ (~275,023 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 550.300 LY (168.735 pc) |