Kepler-1315 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1315 c 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 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.039% across the stellar disk), this world measures 1.844 Earth radii and has a measured mass of 4.06 Earth masses. Combining its mass and radius yields a mean bulk density of 3.57 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.19 g⊕ (11.67 m/s²), and an escape velocity of 16.6 km/s.
In its orbital architecture around Kepler-1315, Kepler-1315 c completes one full revolution every 6.566 Earth days at a semi-major axis of 0.0635 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 105.2 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 777 K (+504°C / +939°F) and receiving 57.60 S⊕ (~78,394 W/m²), Kepler-1315 c 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 4,818 K, a radius of 0.856 R☉, a mass of 0.809 M☉, an estimated bolometric luminosity of 0.354 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.62 Gyr and a metallicity of [Fe/H] = 0.56 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 c sharing its stellar neighborhood alongside Kepler-1315 b.
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) | 4,818 K |
| Stellar Radius | 0.8560 R☉ |
| Stellar Mass | 0.8090 M☉ |
| Bolometric Luminosity | 0.354 L☉ |
| Metallicity [Fe/H] | 0.560 dex |
| Stellar Age | 1.620 Gyr |
| Apparent Magnitude | V: 15.133 · G: 14.952 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.063500 AU |
| Orbital Period | 6.566 days |
| Mean Orbital Velocity | 105.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.0800° |
| Mean Bulk Density | 3.57 g/cm³ (16.6 km/s vesc) |
| Insolation Flux | 57.6000 S⊕ (~78,394 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1568.400 LY (480.869 pc) |