Kepler-1245 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1245 c is a confirmed super-earth exoplanet orbiting the star Kepler-1245, located approximately 2628.6 light-years (805.94 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0253% across the stellar disk), this world measures 1.44 Earth radii and has a measured mass of 2.67 Earth masses. Combining its mass and radius yields a mean bulk density of 4.93 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.29 g⊕ (12.65 m/s²), and an escape velocity of 15.2 km/s.
In its orbital architecture around Kepler-1245, Kepler-1245 c completes one full revolution every 2.937 Earth days at a semi-major axis of 0.0372 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 137.8 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 1190 K (+917°C / +1683°F) and receiving 328.98 S⊕ (~447,747 W/m²), Kepler-1245 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1245 is classified as a stellar host with an effective photospheric temperature of 5,306 K, a radius of 0.83 R☉, a mass of 0.86 M☉, an estimated bolometric luminosity of 0.49 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.57 Gyr and a metallicity of [Fe/H] = -0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-1245 shines at apparent V-band magnitude 15.582 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1245 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1245 c sharing its stellar neighborhood alongside Kepler-1245 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-1245 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,306 K |
| Stellar Radius | 0.8300 R☉ |
| Stellar Mass | 0.8600 M☉ |
| Bolometric Luminosity | 0.49 L☉ |
| Metallicity [Fe/H] | -0.010 dex |
| Stellar Age | 4.570 Gyr |
| Apparent Magnitude | V: 15.582 · G: 15.372 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.037200 AU |
| Orbital Period | 2.937 days |
| Mean Orbital Velocity | 137.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 82.3200° |
| Mean Bulk Density | 4.93 g/cm³ (15.2 km/s vesc) |
| Insolation Flux | 328.9840 S⊕ (~447,747 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2628.600 LY (805.936 pc) |