TOI-5210 b
Astrophysical Synthesis & Habitability Characterization
TOI-5210 b is a confirmed gas giant exoplanet orbiting the star TOI-5210, located approximately 985.3 light-years (302.09 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 0.6617% across the stellar disk), this world measures 10.727 Earth radii (0.96 Jupiter radii) and has a measured mass of 82 Earth masses (0.26 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.37 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.71 g⊕ (6.96 m/s²), and an escape velocity of 30.9 km/s.
In its orbital architecture around TOI-5210, TOI-5210 b completes one full revolution every 4.566 Earth days at a semi-major axis of 0.0557 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 132.7 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.066 carries the world between 0.052 AU at periapsis and 0.0594 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1286 K (+1013°C / +1855°F) and receiving 456.00 S⊕ (~620,616 W/m²), TOI-5210 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5210 is classified as a stellar host with an effective photospheric temperature of 5,723 K, a radius of 1.209 R☉, a mass of 1.105 M☉, an estimated bolometric luminosity of 1.407 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.3 Gyr and a metallicity of [Fe/H] = 0.324 dex (metal-rich relative to the Sun). From Earth, TOI-5210 shines at apparent V-band magnitude 12.118 (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-5210 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,723 K |
| Stellar Radius | 1.2090 R☉ |
| Stellar Mass | 1.1050 M☉ |
| Bolometric Luminosity | 1.407 L☉ |
| Metallicity [Fe/H] | 0.324 dex |
| Stellar Age | 5.300 Gyr |
| Apparent Magnitude | V: 12.118 · G: 11.938 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.055700 AU |
| Orbital Period | 4.566 days |
| Mean Orbital Velocity | 132.7 km/s |
| Orbital Eccentricity (e) | 0.06600 |
| Orbital Inclination (i) | 88.5900° |
| Mean Bulk Density | 0.37 g/cm³ (30.9 km/s vesc) |
| Insolation Flux | 456.0000 S⊕ (~620,616 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 985.300 LY (302.086 pc) |