Kepler-497 b
Astrophysical Synthesis & Habitability Characterization
Kepler-497 b is a confirmed gas giant exoplanet orbiting the star Kepler-497, located approximately 4213.9 light-years (1291.98 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.2489% across the stellar disk), this world measures 6.04 Earth radii (0.54 Jupiter radii) and has a measured mass of 30.4 Earth masses (0.1 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.76 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.83 g⊕ (8.14 m/s²), and an escape velocity of 25.1 km/s.
In its orbital architecture around Kepler-497, Kepler-497 b completes one full revolution every 3.573 Earth days at a semi-major axis of 0.0457 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 139.1 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 1210 K (+937°C / +1719°F) and receiving 1,129.27 S⊕ (~1,536,939 W/m²), Kepler-497 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-497 is classified as a stellar host with an effective photospheric temperature of 5,834 K, a radius of 1.11 R☉, a mass of 1.09 M☉, an estimated bolometric luminosity of 1.281 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.55 Gyr and a metallicity of [Fe/H] = 0.24 dex (metal-rich relative to the Sun). From Earth, Kepler-497 shines at apparent V-band magnitude 14.95 (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-497 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,834 K |
| Stellar Radius | 1.1100 R☉ |
| Stellar Mass | 1.0900 M☉ |
| Bolometric Luminosity | 1.281 L☉ |
| Metallicity [Fe/H] | 0.240 dex |
| Stellar Age | 3.550 Gyr |
| Apparent Magnitude | V: 14.950 · G: 15.099 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.045700 AU |
| Orbital Period | 3.573 days |
| Mean Orbital Velocity | 139.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.6900° |
| Mean Bulk Density | 0.76 g/cm³ (25.1 km/s vesc) |
| Insolation Flux | 1129.2720 S⊕ (~1,536,939 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4213.900 LY (1291.980 pc) |