TOI-4468 b
Astrophysical Synthesis & Habitability Characterization
TOI-4468 b is a confirmed gas giant exoplanet orbiting the star TOI-4468, located approximately 1224.8 light-years (375.52 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.8023% across the stellar disk), this world measures 11.29 Earth radii (1.01 Jupiter radii) and has a measured mass of 170.1 Earth masses (0.54 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.65 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.33 g⊕ (13.04 m/s²), and an escape velocity of 43.4 km/s.
In its orbital architecture around TOI-4468, TOI-4468 b completes one full revolution every 2.771 Earth days at a semi-major axis of 0.03592 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 141 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.03 (ranging from 0.0348 AU at periapsis to 0.037 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1153 K (+880°C / +1616°F) and receiving 295.00 S⊕ (~401,495 W/m²), TOI-4468 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4468 is classified as a stellar host with an effective photospheric temperature of 5,170 K, a radius of 0.771 R☉, a mass of 0.805 M☉, an estimated bolometric luminosity of 0.381 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.4 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, TOI-4468 shines at apparent V-band magnitude 14.077 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-4468 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-4468 b sharing its stellar neighborhood alongside TOI-4468 c.
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-4468 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,170 K |
| Stellar Radius | 0.7710 R☉ |
| Stellar Mass | 0.8050 M☉ |
| Bolometric Luminosity | 0.381 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | 7.400 Gyr |
| Apparent Magnitude | V: 14.077 · G: 13.868 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.035920 AU |
| Orbital Period | 2.771 days |
| Mean Orbital Velocity | 141 km/s |
| Orbital Eccentricity (e) | 0.03000 |
| Orbital Inclination (i) | 89.3500° |
| Mean Bulk Density | 0.65 g/cm³ (43.4 km/s vesc) |
| Insolation Flux | 295.0000 S⊕ (~401,495 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1224.800 LY (375.517 pc) |