Kepler-1386 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1386 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1386, located approximately 2726.3 light-years (835.88 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0122% across the stellar disk), this world measures 1.24 Earth radii and has a measured mass of 2.07 Earth masses. Combining its mass and radius yields a mean bulk density of 5.99 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.35 g⊕ (13.24 m/s²), and an escape velocity of 14.5 km/s.
In its orbital architecture around Kepler-1386, Kepler-1386 b completes one full revolution every 6.74 Earth days at a semi-major axis of 0.068 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 109.8 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 1011 K (+738°C / +1360°F) and receiving 196.53 S⊕ (~267,481 W/m²), Kepler-1386 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1386 is classified as a stellar host with an effective photospheric temperature of 5,733 K, a radius of 1.03 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 1.028 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.01 Gyr and a metallicity of [Fe/H] = 0.11 dex (metal-rich relative to the Sun). From Earth, Kepler-1386 shines at apparent V-band magnitude 14.597 (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-1386 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,733 K |
| Stellar Radius | 1.0300 R☉ |
| Stellar Mass | 1.0200 M☉ |
| Bolometric Luminosity | 1.028 L☉ |
| Metallicity [Fe/H] | 0.110 dex |
| Stellar Age | 5.010 Gyr |
| Apparent Magnitude | V: 14.597 · G: 14.417 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.068000 AU |
| Orbital Period | 6.74 days |
| Mean Orbital Velocity | 109.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 85.9800° |
| Mean Bulk Density | 5.99 g/cm³ (14.5 km/s vesc) |
| Insolation Flux | 196.5330 S⊕ (~267,481 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2726.300 LY (835.882 pc) |