TrES-2 b
Astrophysical Synthesis & Habitability Characterization
TrES-2 b is a confirmed gas giant exoplanet orbiting the star TrES-2, located approximately 702.3 light-years (215.32 parsecs) from the Solar System. First announced in 2006 by TrES using the Transit detection technique (producing an estimated primary transit depth of 1.5571% across the stellar disk), this world measures 15.244 Earth radii (1.36 Jupiter radii) and has a measured mass of 473.567 Earth masses (1.49 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.74 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.04 g⊕ (20.01 m/s²), and an escape velocity of 62.3 km/s.
In its orbital architecture around TrES-2, TrES-2 b completes one full revolution every 2.471 Earth days at a semi-major axis of 0.03568 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 157.1 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1466 K (+1193°C / +2179°F) and receiving 903.86 S⊕ (~1,230,159 W/m²), TrES-2 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TrES-2 is classified as a solar-type yellow star of spectral type G0 V with an effective photospheric temperature of 5,850 K, a radius of 1.12 R☉, a mass of 1.36 M☉, an estimated bolometric luminosity of 1.318 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.55 Gyr and a metallicity of [Fe/H] = -0.15 dex (metal-poor relative to the Sun). From Earth, TrES-2 shines at apparent V-band magnitude 11.254 (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: TrES · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TrES-2 |
| Spectral Type | G0 V |
| Effective Temp (Teff) | 5,850 K |
| Stellar Radius | 1.1200 R☉ |
| Stellar Mass | 1.3600 M☉ |
| Bolometric Luminosity | 1.318 L☉ |
| Metallicity [Fe/H] | -0.150 dex |
| Stellar Age | 3.550 Gyr |
| Apparent Magnitude | V: 11.254 · G: 11.282 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.035680 AU |
| Orbital Period | 2.471 days |
| Mean Orbital Velocity | 157.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 83.5700° |
| Mean Bulk Density | 0.74 g/cm³ (62.3 km/s vesc) |
| Insolation Flux | 903.8640 S⊕ (~1,230,159 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 702.300 LY (215.320 pc) |