WASP-151 b
Astrophysical Synthesis & Habitability Characterization
WASP-151 b is a confirmed gas giant exoplanet orbiting the star WASP-151, located approximately 1477.8 light-years (453.1 parsecs) from the Solar System. First announced in 2017 by SuperWASP-South using the Transit detection technique (producing an estimated primary transit depth of 1.0668% across the stellar disk), this world measures 13.305 Earth radii (1.19 Jupiter radii) and has a measured mass of 100.434 Earth masses (0.32 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.24 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.57 g⊕ (5.59 m/s²), and an escape velocity of 30.7 km/s.
In its orbital architecture around WASP-151, WASP-151 b completes one full revolution every 4.533 Earth days at a semi-major axis of 0.055 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 132 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 1312 K (+1039°C / +1902°F) and receiving 460.00 S⊕ (~626,060 W/m²), WASP-151 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WASP-151 is classified as a solar-type yellow star of spectral type G1 with an effective photospheric temperature of 5,871 K, a radius of 1.181 R☉, a mass of 1.081 M☉, an estimated bolometric luminosity of 1.487 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.5 Gyr and a metallicity of [Fe/H] = 0.1 dex (metal-rich relative to the Sun). From Earth, WASP-151 shines at apparent V-band magnitude 12.821 (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: SuperWASP-South · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WASP-151 |
| Spectral Type | G1 |
| Effective Temp (Teff) | 5,871 K |
| Stellar Radius | 1.1810 R☉ |
| Stellar Mass | 1.0810 M☉ |
| Bolometric Luminosity | 1.487 L☉ |
| Metallicity [Fe/H] | 0.100 dex |
| Stellar Age | 5.500 Gyr |
| Apparent Magnitude | V: 12.821 · G: 12.628 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.055000 AU |
| Orbital Period | 4.533 days |
| Mean Orbital Velocity | 132 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.2500° |
| Mean Bulk Density | 0.24 g/cm³ (30.7 km/s vesc) |
| Insolation Flux | 460.0000 S⊕ (~626,060 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1477.800 LY (453.099 pc) |