WASP-183 b

Astrophysical Synthesis & Habitability Characterization

WASP-183 b is a confirmed gas giant exoplanet orbiting the star WASP-183, located approximately 1061.2 light-years (325.38 parsecs) from the Solar System. First announced in 2019 by SuperWASP using the Transit detection technique (producing an estimated primary transit depth of 3.0079% across the stellar disk), this world measures 16.477 Earth radii (1.47 Jupiter radii) and has a measured mass of 159.551 Earth masses (0.5 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.2 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.59 g⊕ (5.79 m/s²), and an escape velocity of 34.8 km/s.

In its orbital architecture around WASP-183, WASP-183 b completes one full revolution every 4.112 Earth days at a semi-major axis of 0.04632 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 122.6 km/s (compared to Earth's 29.8 km/s).

⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1111 K (+838°C / +1540°F) and receiving 268.72 S⊕ (~365,725 W/m²), WASP-183 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star WASP-183 is classified as a solar-type yellow star of spectral type G9 with an effective photospheric temperature of 5,313 K, a radius of 0.871 R☉, a mass of 0.784 M☉, an estimated bolometric luminosity of 0.542 L☉. Stellar evolution modeling indicates an estimated stellar age of 14.9 Gyr and a metallicity of [Fe/H] = -0.31 dex (metal-poor relative to the Sun). From Earth, WASP-183 shines at apparent V-band magnitude 13.081 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.

Discovery Facility: SuperWASP · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).