WASP-182 b
Astrophysical Synthesis & Habitability Characterization
WASP-182 b is a confirmed gas giant exoplanet orbiting the star WASP-182, located approximately 1068.5 light-years (327.6 parsecs) from the Solar System. First announced in 2019 by WASP-South using the Transit detection technique (producing an estimated primary transit depth of 0.4249% across the stellar disk), this world measures 9.528 Earth radii (0.85 Jupiter radii) and has a measured mass of 47.039 Earth masses (0.15 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.3 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.52 g⊕ (5.1 m/s²), and an escape velocity of 24.9 km/s.
In its orbital architecture around WASP-182, WASP-182 b completes one full revolution every 3.377 Earth days at a semi-major axis of 0.0451 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 145.3 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 1479 K (+1206°C / +2203°F) and receiving 756.26 S⊕ (~1,029,271 W/m²), WASP-182 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WASP-182 is classified as a solar-type yellow star of spectral type G5 with an effective photospheric temperature of 5,638 K, a radius of 1.34 R☉, a mass of 1.076 M☉, an estimated bolometric luminosity of 1.628 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.952 Gyr and a metallicity of [Fe/H] = 0.27 dex (metal-rich relative to the Sun). From Earth, WASP-182 shines at apparent V-band magnitude 11.98 (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: WASP-South · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WASP-182 |
| Spectral Type | G5 |
| Effective Temp (Teff) | 5,638 K |
| Stellar Radius | 1.3400 R☉ |
| Stellar Mass | 1.0760 M☉ |
| Bolometric Luminosity | 1.628 L☉ |
| Metallicity [Fe/H] | 0.270 dex |
| Stellar Age | 5.952 Gyr |
| Apparent Magnitude | V: 11.980 · G: 11.917 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.045100 AU |
| Orbital Period | 3.377 days |
| Mean Orbital Velocity | 145.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 83.8800° |
| Mean Bulk Density | 0.3 g/cm³ (24.9 km/s vesc) |
| Insolation Flux | 756.2610 S⊕ (~1,029,271 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1068.500 LY (327.602 pc) |