WASP-65 b
Astrophysical Synthesis & Habitability Characterization
WASP-65 b is a confirmed gas giant exoplanet orbiting the star WASP-65, located approximately 892.7 light-years (273.7 parsecs) from the Solar System. First announced in 2013 by SuperWASP using the Transit detection technique (producing an estimated primary transit depth of 1.28% across the stellar disk), this world measures 12.464 Earth radii (1.11 Jupiter radii) and has a measured mass of 492.62 Earth masses (1.55 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.4 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.17 g⊕ (31.09 m/s²), and an escape velocity of 70.3 km/s.
In its orbital architecture around WASP-65, WASP-65 b completes one full revolution every 2.311 Earth days at a semi-major axis of 0.0334 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 157.2 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 1480 K (+1207°C / +2205°F) and receiving 957.01 S⊕ (~1,302,484 W/m²), WASP-65 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star WASP-65 is classified as a solar-type yellow star of spectral type G6 with an effective photospheric temperature of 5,600 K, a radius of 1.01 R☉, a mass of 0.93 M☉, an estimated bolometric luminosity of 0.9 L☉. Stellar evolution modeling indicates an estimated stellar age of 8 Gyr and a metallicity of [Fe/H] = -0.07 dex (near-solar heavy-element abundance). From Earth, WASP-65 shines at apparent V-band magnitude 11.869 (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 · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | WASP-65 |
| Spectral Type | G6 |
| Effective Temp (Teff) | 5,600 K |
| Stellar Radius | 1.0100 R☉ |
| Stellar Mass | 0.9300 M☉ |
| Bolometric Luminosity | 0.9 L☉ |
| Metallicity [Fe/H] | -0.070 dex |
| Stellar Age | 8.000 Gyr |
| Apparent Magnitude | V: 11.869 · G: 11.751 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.033400 AU |
| Orbital Period | 2.311 days |
| Mean Orbital Velocity | 157.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.8000° |
| Mean Bulk Density | 1.4 g/cm³ (70.3 km/s vesc) |
| Insolation Flux | 957.0053 S⊕ (~1,302,484 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 892.700 LY (273.703 pc) |