TOI-5592 b
Astrophysical Synthesis & Habitability Characterization
TOI-5592 b is a confirmed gas giant exoplanet orbiting the star TOI-5592, located approximately 1947.2 light-years (597.03 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 1.274% across the stellar disk), this world measures 17.15 Earth radii (1.53 Jupiter radii) and has a measured mass of 285.728 Earth masses (0.9 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.31 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.97 g⊕ (9.51 m/s²), and an escape velocity of 45.7 km/s.
In its orbital architecture around TOI-5592, TOI-5592 b completes one full revolution every 2.609 Earth days at a semi-major axis of 0.03935 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 164.1 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.062 carries the world between 0.0369 AU at periapsis and 0.0418 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1789 K (+1516°C / +2761°F) and receiving 1,712.00 S⊕ (~2,330,032 W/m²), TOI-5592 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5592 is classified as a stellar host with an effective photospheric temperature of 6,237 K, a radius of 1.393 R☉, a mass of 1.194 M☉, an estimated bolometric luminosity of 2.634 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.6 Gyr and a metallicity of [Fe/H] = -0.013 dex (near-solar heavy-element abundance). From Earth, TOI-5592 shines at apparent V-band magnitude 12.614 (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-5592 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,237 K |
| Stellar Radius | 1.3930 R☉ |
| Stellar Mass | 1.1940 M☉ |
| Bolometric Luminosity | 2.634 L☉ |
| Metallicity [Fe/H] | -0.013 dex |
| Stellar Age | 3.600 Gyr |
| Apparent Magnitude | V: 12.614 · G: 12.496 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.039350 AU |
| Orbital Period | 2.609 days |
| Mean Orbital Velocity | 164.1 km/s |
| Orbital Eccentricity (e) | 0.06200 |
| Orbital Inclination (i) | 81.1400° |
| Mean Bulk Density | 0.31 g/cm³ (45.7 km/s vesc) |
| Insolation Flux | 1712.0000 S⊕ (~2,330,032 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1947.200 LY (597.026 pc) |