WASP-180 A b
Astrophysical Synthesis & Habitability Characterization
WASP-180 A b is a confirmed gas giant exoplanet orbiting the star WASP-180 A, located approximately 828.4 light-years (253.99 parsecs) from the Solar System. First announced in 2019 by SuperWASP using the Transit detection technique (producing an estimated primary transit depth of 1.1466% across the stellar disk), this world measures 13.899 Earth radii (1.24 Jupiter radii) and has a measured mass of 286.047 Earth masses (0.9 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.59 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.48 g⊕ (14.51 m/s²), and an escape velocity of 50.7 km/s.
In its orbital architecture around WASP-180 A, WASP-180 A b completes one full revolution every 3.409 Earth days at a semi-major axis of 0.048 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 153.2 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 1540 K (+1267°C / +2313°F) and receiving 918.39 S⊕ (~1,249,926 W/m²), WASP-180 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WASP-180 A is classified as a warm F-type star of spectral type F7 V with an effective photospheric temperature of 6,600 K, a radius of 1.19 R☉, a mass of 1.3 M☉, an estimated bolometric luminosity of 2.411 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.2 Gyr and a metallicity of [Fe/H] = 0.1 dex (metal-rich relative to the Sun). From Earth, WASP-180 A shines at apparent V-band magnitude 10.655 (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: SuperWASP · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WASP-180 A |
| Spectral Type | F7 V |
| Effective Temp (Teff) | 6,600 K |
| Stellar Radius | 1.1900 R☉ |
| Stellar Mass | 1.3000 M☉ |
| Bolometric Luminosity | 2.411 L☉ |
| Metallicity [Fe/H] | 0.100 dex |
| Stellar Age | 1.200 Gyr |
| Apparent Magnitude | V: 10.655 · G: 10.913 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.048000 AU |
| Orbital Period | 3.409 days |
| Mean Orbital Velocity | 153.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.1000° |
| Mean Bulk Density | 0.59 g/cm³ (50.7 km/s vesc) |
| Insolation Flux | 918.3877 S⊕ (~1,249,926 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 828.400 LY (253.985 pc) |