TOI-5422 b
Astrophysical Synthesis & Habitability Characterization
TOI-5422 b is a confirmed gas giant exoplanet orbiting the star TOI-5422, located approximately 1129 light-years (346.14 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 0.3205% across the stellar disk), this world measures 9.102 Earth radii (0.81 Jupiter radii) and has a measured mass of 8899.195 Earth masses (28 Jupiter masses). Combining its mass and radius yields a mean bulk density of 65.07 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 107.42 g⊕ (1053.43 m/s²), and an escape velocity of 349.8 km/s.
In its orbital architecture around TOI-5422, TOI-5422 b completes one full revolution every 5.377 Earth days at a semi-major axis of 0.0619 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 125.2 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.094 carries the world between 0.0561 AU at periapsis and 0.0677 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1369 K (+1096°C / +2005°F) and receiving 580.00 S⊕ (~789,380 W/m²), TOI-5422 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5422 is classified as a stellar host with an effective photospheric temperature of 5,820 K, a radius of 1.474 R☉, a mass of 1.066 M☉, an estimated bolometric luminosity of 2.237 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.6 Gyr and a metallicity of [Fe/H] = -0.012 dex (near-solar heavy-element abundance). From Earth, TOI-5422 shines at apparent V-band magnitude 11.499 (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-5422 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,820 K |
| Stellar Radius | 1.4740 R☉ |
| Stellar Mass | 1.0660 M☉ |
| Bolometric Luminosity | 2.237 L☉ |
| Metallicity [Fe/H] | -0.012 dex |
| Stellar Age | 7.600 Gyr |
| Apparent Magnitude | V: 11.499 · G: 11.708 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.061900 AU |
| Orbital Period | 5.377 days |
| Mean Orbital Velocity | 125.2 km/s |
| Orbital Eccentricity (e) | 0.09400 |
| Orbital Inclination (i) | 88.7100° |
| Mean Bulk Density | 65.07 g/cm³ (349.8 km/s vesc) |
| Insolation Flux | 580.0000 S⊕ (~789,380 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1129.000 LY (346.141 pc) |