HAT-P-47 b
Astrophysical Synthesis & Habitability Characterization
HAT-P-47 b is a confirmed gas giant exoplanet orbiting the star HAT-P-47, located approximately 920.1 light-years (282.1 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.7931% across the stellar disk), this world measures 14.717 Earth radii (1.31 Jupiter radii) and has a measured mass of 65.473 Earth masses (0.21 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 0.3 g⊕ (2.94 m/s²), and an escape velocity of 23.6 km/s.
In its orbital architecture around HAT-P-47, HAT-P-47 b completes one full revolution every 4.732 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1605 K (+1332°C / +2430°F) and receiving 379.57 S⊕ (~516,591 W/m²), HAT-P-47 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HAT-P-47 is classified as a warm F-type star of spectral type F with an effective photospheric temperature of 6,703 K, a radius of 1.515 R☉, a mass of 1.387 M☉, an estimated bolometric luminosity of 4.157 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.5 Gyr and a metallicity of [Fe/H] = -0.026 dex (near-solar heavy-element abundance). From Earth, HAT-P-47 shines at apparent V-band magnitude 10.609 (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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HAT-P-47 |
| Spectral Type | F |
| Effective Temp (Teff) | 6,703 K |
| Stellar Radius | 1.5150 R☉ |
| Stellar Mass | 1.3870 M☉ |
| Bolometric Luminosity | 4.157 L☉ |
| Metallicity [Fe/H] | -0.026 dex |
| Stellar Age | 1.500 Gyr |
| Apparent Magnitude | V: 10.609 · G: 10.547 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 4.732 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 84.5600° |
| Mean Bulk Density | 0.11 g/cm³ (23.6 km/s vesc) |
| Insolation Flux | 379.5670 S⊕ (~516,591 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 920.100 LY (282.096 pc) |