WASP-190 b

Astrophysical Synthesis & Habitability Characterization

WASP-190 b is a confirmed gas giant exoplanet orbiting the star WASP-190, located approximately 1768.6 light-years (542.25 parsecs) from the Solar System. First announced in 2019 by WASP-South using the Transit detection technique (producing an estimated primary transit depth of 0.5455% across the stellar disk), this world measures 12.89 Earth radii (1.15 Jupiter radii) and has a measured mass of 317.83 Earth masses (1 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.82 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.91 g⊕ (18.73 m/s²), and an escape velocity of 55.5 km/s.

In its orbital architecture around WASP-190, WASP-190 b completes one full revolution every 5.368 Earth days at a semi-major axis of 0.0663 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 134.4 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 1500 K (+1227°C / +2241°F) and receiving 747.13 S⊕ (~1,016,847 W/m²), WASP-190 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star WASP-190 is classified as a warm F-type star of spectral type F6 IV-V with an effective photospheric temperature of 6,400 K, a radius of 1.6 R☉, a mass of 1.35 M☉, an estimated bolometric luminosity of 3.853 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, WASP-190 shines at apparent V-band magnitude 11.645 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.

Discovery Facility: WASP-South · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).