TOI-2529 b
Astrophysical Synthesis & Habitability Characterization
TOI-2529 b is a confirmed gas giant exoplanet orbiting the star TOI-2529, located approximately 966.3 light-years (296.27 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.3876% across the stellar disk), this world measures 11.545 Earth radii (1.03 Jupiter radii) and has a measured mass of 743.718 Earth masses (2.34 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.66 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 5.58 g⊕ (54.72 m/s²), and an escape velocity of 89.8 km/s.
In its orbital architecture around TOI-2529, TOI-2529 b completes one full revolution every 64.595 Earth days at a semi-major axis of 0.327 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 55.1 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.021 (ranging from 0.3201 AU at periapsis to 0.3339 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 636 K (+363°C / +685°F) and receiving 70.97 S⊕ (~96,594 W/m²), TOI-2529 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2529 is classified as a stellar host with an effective photospheric temperature of 5,802 K, a radius of 1.7 R☉, a mass of 1.11 M☉, an estimated bolometric luminosity of 2.938 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.23 Gyr and a metallicity of [Fe/H] = 0.1 dex (metal-rich relative to the Sun). From Earth, TOI-2529 shines at apparent V-band magnitude 11.529 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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-2529 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,802 K |
| Stellar Radius | 1.7000 R☉ |
| Stellar Mass | 1.1100 M☉ |
| Bolometric Luminosity | 2.938 L☉ |
| Metallicity [Fe/H] | 0.100 dex |
| Stellar Age | 7.230 Gyr |
| Apparent Magnitude | V: 11.529 · G: 11.191 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.327000 AU |
| Orbital Period | 64.595 days |
| Mean Orbital Velocity | 55.1 km/s |
| Orbital Eccentricity (e) | 0.02100 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.66 g/cm³ (89.8 km/s vesc) |
| Insolation Flux | 70.9731 S⊕ (~96,594 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 966.300 LY (296.271 pc) |