Kepler-1368 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1368 b is a confirmed super-earth exoplanet orbiting the star Kepler-1368, located approximately 5335.3 light-years (1635.82 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0196% across the stellar disk), this world measures 1.65 Earth radii and has a measured mass of 3.36 Earth masses. Combining its mass and radius yields a mean bulk density of 4.12 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.23 g⊕ (12.06 m/s²), and an escape velocity of 16 km/s.
In its orbital architecture around Kepler-1368, Kepler-1368 b completes one full revolution every 0.676 Earth days at a semi-major axis of 0.0153 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 246.4 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 2085 K (+1812°C / +3294°F) and receiving 4,849.26 S⊕ (~6,599,839 W/m²), Kepler-1368 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1368 is classified as a stellar host with an effective photospheric temperature of 5,906 K, a radius of 1.08 R☉, a mass of 1.07 M☉, an estimated bolometric luminosity of 1.273 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.47 Gyr and a metallicity of [Fe/H] = 0.1 dex (metal-rich relative to the Sun). From Earth, Kepler-1368 shines at apparent V-band magnitude 15.914 (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-1368 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,906 K |
| Stellar Radius | 1.0800 R☉ |
| Stellar Mass | 1.0700 M☉ |
| Bolometric Luminosity | 1.273 L☉ |
| Metallicity [Fe/H] | 0.100 dex |
| Stellar Age | 3.470 Gyr |
| Apparent Magnitude | V: 15.914 · G: 15.873 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.015300 AU |
| Orbital Period | 0.676 days |
| Mean Orbital Velocity | 246.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.4100° |
| Mean Bulk Density | 4.12 g/cm³ (16 km/s vesc) |
| Insolation Flux | 4849.2570 S⊕ (~6,599,839 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 5335.300 LY (1635.820 pc) |