Kepler-419 b
Astrophysical Synthesis & Habitability Characterization
Kepler-419 b is a confirmed gas giant exoplanet orbiting the star Kepler-419, located approximately 3298.6 light-years (1011.36 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.3238% across the stellar disk), this world measures 10.8 Earth radii (0.96 Jupiter radii) and has a measured mass of 794.5 Earth masses (2.5 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.48 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 6.81 g⊕ (66.78 m/s²), and an escape velocity of 95.9 km/s.
In its orbital architecture around Kepler-419, Kepler-419 b completes one full revolution every 69.755 Earth days at a semi-major axis of 0.37 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 57.7 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.833, swinging from 0.0618 AU at periapsis out to 0.6782 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 613 K (+340°C / +644°F) and receiving 37.42 S⊕ (~50,923 W/m²), Kepler-419 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-419 is classified as a warm F-type star of spectral type F with an effective photospheric temperature of 6,430 K, a radius of 1.74 R☉, a mass of 1.39 M☉, an estimated bolometric luminosity of 4.643 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.14 Gyr and a metallicity of [Fe/H] = 0.176 dex (metal-rich relative to the Sun). From Earth, Kepler-419 shines at apparent V-band magnitude 13.089 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-419 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-419 b sharing its stellar neighborhood alongside Kepler-419 c.
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-419 |
| Spectral Type | F |
| Effective Temp (Teff) | 6,430 K |
| Stellar Radius | 1.7400 R☉ |
| Stellar Mass | 1.3900 M☉ |
| Bolometric Luminosity | 4.643 L☉ |
| Metallicity [Fe/H] | 0.176 dex |
| Stellar Age | 2.140 Gyr |
| Apparent Magnitude | V: 13.089 · G: 12.964 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.370000 AU |
| Orbital Period | 69.755 days |
| Mean Orbital Velocity | 57.7 km/s |
| Orbital Eccentricity (e) | 0.83300 |
| Orbital Inclination (i) | 88.9500° |
| Mean Bulk Density | 3.48 g/cm³ (95.9 km/s vesc) |
| Insolation Flux | 37.4160 S⊕ (~50,923 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3298.600 LY (1011.360 pc) |