HAT-P-41 b
Astrophysical Synthesis & Habitability Characterization
HAT-P-41 b is a confirmed gas giant exoplanet orbiting the star HAT-P-41, located approximately 1135.6 light-years (348.19 parsecs) from the Solar System. First announced in 2012 by HATNet using the Transit detection technique (producing an estimated primary transit depth of 1.056% across the stellar disk), this world measures 22.978 Earth radii (2.05 Jupiter radii) and has a measured mass of 378.218 Earth masses (1.19 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.17 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.72 g⊕ (7.06 m/s²), and an escape velocity of 45.4 km/s.
In its orbital architecture around HAT-P-41, HAT-P-41 b completes one full revolution every 2.694 Earth days at a semi-major axis of 0.04258 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). 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 1941 K (+1668°C / +3034°F) and receiving 2,485.07 S⊕ (~3,382,183 W/m²), HAT-P-41 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HAT-P-41 is classified as a stellar host with an effective photospheric temperature of 6,390 K, a radius of 2.05 R☉, a mass of 2.56 M☉, an estimated bolometric luminosity of 6.286 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.2 Gyr and a metallicity of [Fe/H] = 0.21 dex (metal-rich relative to the Sun). From Earth, HAT-P-41 shines at apparent V-band magnitude 11.365 (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-41 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,390 K |
| Stellar Radius | 2.0500 R☉ |
| Stellar Mass | 2.5600 M☉ |
| Bolometric Luminosity | 6.286 L☉ |
| Metallicity [Fe/H] | 0.210 dex |
| Stellar Age | 2.200 Gyr |
| Apparent Magnitude | V: 11.365 · G: 10.939 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.042580 AU |
| Orbital Period | 2.694 days |
| Mean Orbital Velocity | 171.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.7000° |
| Mean Bulk Density | 0.17 g/cm³ (45.4 km/s vesc) |
| Insolation Flux | 2485.0721 S⊕ (~3,382,183 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1135.600 LY (348.185 pc) |