Kepler-1426 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1426 b is a confirmed super-earth exoplanet orbiting the star Kepler-1426, located approximately 5537.5 light-years (1697.81 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0197% across the stellar disk), this world measures 1.56 Earth radii and has a measured mass of 3.05 Earth masses. Combining its mass and radius yields a mean bulk density of 4.43 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.25 g⊕ (12.26 m/s²), and an escape velocity of 15.6 km/s.
In its orbital architecture around Kepler-1426, Kepler-1426 b completes one full revolution every 14.256 Earth days at a semi-major axis of 0.1187 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 90.6 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 797 K (+524°C / +975°F) and receiving 95.22 S⊕ (~129,594 W/m²), Kepler-1426 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1426 is classified as a stellar host with an effective photospheric temperature of 5,831 K, a radius of 1.02 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 1.079 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.07 Gyr and a metallicity of [Fe/H] = 0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-1426 shines at apparent V-band magnitude 15.464 (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-1426 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,831 K |
| Stellar Radius | 1.0200 R☉ |
| Stellar Mass | 1.0200 M☉ |
| Bolometric Luminosity | 1.079 L☉ |
| Metallicity [Fe/H] | 0.030 dex |
| Stellar Age | 4.070 Gyr |
| Apparent Magnitude | V: 15.464 · G: 15.166 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.118700 AU |
| Orbital Period | 14.256 days |
| Mean Orbital Velocity | 90.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 85.3300° |
| Mean Bulk Density | 4.43 g/cm³ (15.6 km/s vesc) |
| Insolation Flux | 95.2200 S⊕ (~129,594 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 5537.500 LY (1697.810 pc) |