TOI-5322 b
Astrophysical Synthesis & Habitability Characterization
TOI-5322 b is a confirmed gas giant exoplanet orbiting the star TOI-5322, located approximately 1555.4 light-years (476.9 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 1.0852% across the stellar disk), this world measures 16.612 Earth radii (1.48 Jupiter radii) and has a measured mass of 184.023 Earth masses (0.58 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.22 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.67 g⊕ (6.57 m/s²), and an escape velocity of 37.2 km/s.
In its orbital architecture around TOI-5322, TOI-5322 b completes one full revolution every 5.423 Earth days at a semi-major axis of 0.0604 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 121.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.055 carries the world between 0.0571 AU at periapsis and 0.0637 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1350 K (+1077°C / +1971°F) and receiving 554.00 S⊕ (~753,994 W/m²), TOI-5322 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5322 is classified as a stellar host with an effective photospheric temperature of 5,692 K, a radius of 1.462 R☉, a mass of 0.998 M☉, an estimated bolometric luminosity of 2.013 L☉. Stellar evolution modeling indicates an estimated stellar age of 9.7 Gyr and a metallicity of [Fe/H] = -0.048 dex (near-solar heavy-element abundance). From Earth, TOI-5322 shines at apparent V-band magnitude 12.733 (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-5322 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,692 K |
| Stellar Radius | 1.4620 R☉ |
| Stellar Mass | 0.9980 M☉ |
| Bolometric Luminosity | 2.013 L☉ |
| Metallicity [Fe/H] | -0.048 dex |
| Stellar Age | 9.700 Gyr |
| Apparent Magnitude | V: 12.733 · G: 12.484 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060400 AU |
| Orbital Period | 5.423 days |
| Mean Orbital Velocity | 121.2 km/s |
| Orbital Eccentricity (e) | 0.05500 |
| Orbital Inclination (i) | 89.1900° |
| Mean Bulk Density | 0.22 g/cm³ (37.2 km/s vesc) |
| Insolation Flux | 554.0000 S⊕ (~753,994 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1555.400 LY (476.899 pc) |