WTS-1 b
Astrophysical Synthesis & Habitability Characterization
WTS-1 b is a confirmed gas giant exoplanet orbiting the star WTS-1, located approximately 7651.7 light-years (2346.01 parsecs) from the Solar System. First announced in 2012 by United Kingdom Infrared Telescope using the Transit detection technique (producing an estimated primary transit depth of 1.7725% across the stellar disk), this world measures 16.7 Earth radii (1.49 Jupiter radii) and has a measured mass of 1274.44 Earth masses (4.01 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.51 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 4.57 g⊕ (44.82 m/s²), and an escape velocity of 97.7 km/s.
In its orbital architecture around WTS-1, WTS-1 b completes one full revolution every 3.352 Earth days at a semi-major axis of 0.047 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 152.5 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.1 carries the world between 0.0423 AU at periapsis and 0.0517 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1500 K (+1227°C / +2241°F) and receiving 554.92 S⊕ (~755,244 W/m²), WTS-1 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WTS-1 is classified as a warm F-type star of spectral type F6 V with an effective photospheric temperature of 6,250 K, a radius of 1.15 R☉, a mass of 1.2 M☉, an estimated bolometric luminosity of 1.811 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.55 Gyr and a metallicity of [Fe/H] = -0.5 dex (metal-poor relative to the Sun). From Earth, WTS-1 shines at apparent V-band magnitude 16.644 (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: United Kingdom Infrared Telescope · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WTS-1 |
| Spectral Type | F6 V |
| Effective Temp (Teff) | 6,250 K |
| Stellar Radius | 1.1500 R☉ |
| Stellar Mass | 1.2000 M☉ |
| Bolometric Luminosity | 1.811 L☉ |
| Metallicity [Fe/H] | -0.500 dex |
| Stellar Age | 2.550 Gyr |
| Apparent Magnitude | V: 16.644 · G: 16.430 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.047000 AU |
| Orbital Period | 3.352 days |
| Mean Orbital Velocity | 152.5 km/s |
| Orbital Eccentricity (e) | 0.10000 |
| Orbital Inclination (i) | 85.5000° |
| Mean Bulk Density | 1.51 g/cm³ (97.7 km/s vesc) |
| Insolation Flux | 554.9183 S⊕ (~755,244 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 7651.700 LY (2346.010 pc) |