TOI-2169 A b
Astrophysical Synthesis & Habitability Characterization
TOI-2169 A b is a confirmed gas giant exoplanet orbiting the star TOI-2169 A, located approximately 1146.4 light-years (351.49 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 0.397% across the stellar disk), this world measures 12.509 Earth radii (1.12 Jupiter radii) and has a measured mass of 329.588 Earth masses (1.04 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.93 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.11 g⊕ (20.69 m/s²), and an escape velocity of 57.4 km/s.
In its orbital architecture around TOI-2169 A, TOI-2169 A b completes one full revolution every 8.215 Earth days at a semi-major axis of 0.0896 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 118.7 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.045 (ranging from 0.0856 AU at periapsis to 0.0936 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1364 K (+1091°C / +1996°F) and receiving 577.00 S⊕ (~785,297 W/m²), TOI-2169 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2169 A is classified as a stellar host with an effective photospheric temperature of 6,270 K, a radius of 1.82 R☉, a mass of 1.42 M☉, an estimated bolometric luminosity of 4.593 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.51 Gyr and a metallicity of [Fe/H] = 0.123 dex (metal-rich relative to the Sun). From Earth, TOI-2169 A shines at apparent V-band magnitude 11.16 (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-2169 A |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,270 K |
| Stellar Radius | 1.8200 R☉ |
| Stellar Mass | 1.4200 M☉ |
| Bolometric Luminosity | 4.593 L☉ |
| Metallicity [Fe/H] | 0.123 dex |
| Stellar Age | 2.510 Gyr |
| Apparent Magnitude | V: 11.160 · G: 10.956 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.089600 AU |
| Orbital Period | 8.215 days |
| Mean Orbital Velocity | 118.7 km/s |
| Orbital Eccentricity (e) | 0.04500 |
| Orbital Inclination (i) | 85.8000° |
| Mean Bulk Density | 0.93 g/cm³ (57.4 km/s vesc) |
| Insolation Flux | 577.0000 S⊕ (~785,297 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1146.400 LY (351.487 pc) |