TOI-1333 b
Astrophysical Synthesis & Habitability Characterization
TOI-1333 b is a confirmed gas giant exoplanet orbiting the star TOI-1333, located approximately 653.9 light-years (200.49 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.5554% across the stellar disk), this world measures 15.648 Earth radii (1.4 Jupiter radii) and has a measured mass of 753.257 Earth masses (2.37 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.08 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.08 g⊕ (30.2 m/s²), and an escape velocity of 77.6 km/s.
In its orbital architecture around TOI-1333, TOI-1333 b completes one full revolution every 4.72 Earth days at a semi-major axis of 0.0626 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 144.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.073 carries the world between 0.058 AU at periapsis and 0.0672 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1679 K (+1406°C / +2563°F) and receiving 1,112.85 S⊕ (~1,514,589 W/m²), TOI-1333 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1333 is classified as a stellar host with an effective photospheric temperature of 6,274 K, a radius of 1.925 R☉, a mass of 1.464 M☉, an estimated bolometric luminosity of 5.151 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.33 Gyr and a metallicity of [Fe/H] = 0.119 dex (metal-rich relative to the Sun). From Earth, TOI-1333 shines at apparent V-band magnitude 9.438 (accessible to binoculars and small amateur telescopes) 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-1333 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,274 K |
| Stellar Radius | 1.9250 R☉ |
| Stellar Mass | 1.4640 M☉ |
| Bolometric Luminosity | 5.151 L☉ |
| Metallicity [Fe/H] | 0.119 dex |
| Stellar Age | 2.330 Gyr |
| Apparent Magnitude | V: 9.438 · G: 9.350 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.062600 AU |
| Orbital Period | 4.72 days |
| Mean Orbital Velocity | 144.3 km/s |
| Orbital Eccentricity (e) | 0.07300 |
| Orbital Inclination (i) | 85.7000° |
| Mean Bulk Density | 1.08 g/cm³ (77.6 km/s vesc) |
| Insolation Flux | 1112.8500 S⊕ (~1,514,589 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 653.900 LY (200.492 pc) |