Kepler-471 b
Astrophysical Synthesis & Habitability Characterization
Kepler-471 b is a confirmed gas giant exoplanet orbiting the star Kepler-471, located approximately 4075 light-years (1249.41 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.5806% across the stellar disk), this world has a measured radius of 14.96 Earth radii (1.33 R♃), though radial-velocity mass constraints remain unmeasured in the current composite catalogue.
In its orbital architecture around Kepler-471, Kepler-471 b completes one full revolution every 5.014 Earth days at a semi-major axis of 0.0626 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 135.8 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 1308 K (+1035°C / +1895°F) and receiving 1,146.88 S⊕ (~1,560,901 W/m²), Kepler-471 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-471 is classified as a stellar host with an effective photospheric temperature of 6,733 K, a radius of 1.8 R☉, a mass of 1.49 M☉, an estimated bolometric luminosity of 5.974 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.58 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, Kepler-471 shines at apparent V-band magnitude 13.767 (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: Kepler · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Kepler-471 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,733 K |
| Stellar Radius | 1.8000 R☉ |
| Stellar Mass | 1.4900 M☉ |
| Bolometric Luminosity | 5.974 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | 1.580 Gyr |
| Apparent Magnitude | V: 13.767 · G: 13.789 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.062600 AU |
| Orbital Period | 5.014 days |
| Mean Orbital Velocity | 135.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.5800° |
| Insolation Flux | 1146.8780 S⊕ (~1,560,901 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4075.000 LY (1249.410 pc) |