HAT-P-32 b
Astrophysical Synthesis & Habitability Characterization
HAT-P-32 b is a confirmed gas giant exoplanet orbiting the star HAT-P-32, located approximately 943.3 light-years (289.21 parsecs) from the Solar System. First announced in 2011 by HATNet using the Transit detection technique (producing an estimated primary transit depth of 2.2155% across the stellar disk), this world measures 22.194 Earth radii (1.98 Jupiter radii) and has a measured mass of 216.124 Earth masses (0.68 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.11 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.44 g⊕ (4.31 m/s²), and an escape velocity of 34.9 km/s.
In its orbital architecture around HAT-P-32, HAT-P-32 b completes one full revolution every 2.15 Earth days at a semi-major axis of 0.03397 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 171.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.159 carries the world between 0.0286 AU at periapsis and 0.0394 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1836 K (+1563°C / +2845°F) and receiving 1,841.00 S⊕ (~2,505,601 W/m²), HAT-P-32 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HAT-P-32 is classified as a stellar host with an effective photospheric temperature of 6,001 K, a radius of 1.367 R☉, a mass of 1.132 M☉, an estimated bolometric luminosity of 2.174 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.7 Gyr and a metallicity of [Fe/H] = -0.16 dex (metal-poor relative to the Sun). From Earth, HAT-P-32 shines at apparent V-band magnitude 11.439 (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: HATNet · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HAT-P-32 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,001 K |
| Stellar Radius | 1.3670 R☉ |
| Stellar Mass | 1.1320 M☉ |
| Bolometric Luminosity | 2.174 L☉ |
| Metallicity [Fe/H] | -0.160 dex |
| Stellar Age | 2.700 Gyr |
| Apparent Magnitude | V: 11.439 · G: 11.134 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.033970 AU |
| Orbital Period | 2.15 days |
| Mean Orbital Velocity | 171.9 km/s |
| Orbital Eccentricity (e) | 0.15900 |
| Orbital Inclination (i) | 88.9800° |
| Mean Bulk Density | 0.11 g/cm³ (34.9 km/s vesc) |
| Insolation Flux | 1841.0000 S⊕ (~2,505,601 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 943.300 LY (289.205 pc) |