Kepler-1315 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1315 b is a confirmed super-earth exoplanet orbiting the star Kepler-1315, located approximately 1568.4 light-years (480.87 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0285% across the stellar disk), this world measures 1.38 Earth radii and has a measured mass of 2.48 Earth masses. Combining its mass and radius yields a mean bulk density of 5.2 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.3 g⊕ (12.75 m/s²), and an escape velocity of 15 km/s.
In its orbital architecture around Kepler-1315, Kepler-1315 b completes one full revolution every 0.843 Earth days at a semi-major axis of 0.01617 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 208.6 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 1541 K (+1268°C / +2314°F) and receiving 897.90 S⊕ (~1,222,042 W/m²), Kepler-1315 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1315 is classified as a stellar host with an effective photospheric temperature of 4,861 K, a radius of 0.75 R☉, a mass of 0.8 M☉, an estimated bolometric luminosity of 0.282 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.47 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, Kepler-1315 shines at apparent V-band magnitude 15.133 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1315 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1315 b sharing its stellar neighborhood alongside Kepler-1315 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-1315 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,861 K |
| Stellar Radius | 0.7500 R☉ |
| Stellar Mass | 0.8000 M☉ |
| Bolometric Luminosity | 0.282 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | 3.470 Gyr |
| Apparent Magnitude | V: 15.133 · G: 14.952 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.016170 AU |
| Orbital Period | 0.843 days |
| Mean Orbital Velocity | 208.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 78.2300° |
| Mean Bulk Density | 5.2 g/cm³ (15 km/s vesc) |
| Insolation Flux | 897.9000 S⊕ (~1,222,042 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1568.400 LY (480.869 pc) |