Kepler-245 e
Astrophysical Synthesis & Habitability Characterization
Kepler-245 e is a confirmed super-earth exoplanet orbiting the star Kepler-245, located approximately 2809.9 light-years (861.53 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0402% across the stellar disk), this world measures 1.75 Earth radii and has a measured mass of 1806.36 Earth masses (5.68 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1858.48 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 589.83 g⊕ (5784.26 m/s²), and an escape velocity of 359.4 km/s.
In its orbital architecture around Kepler-245, Kepler-245 e completes one full revolution every 3.22 Earth days at a semi-major axis of 0.04053 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 136.9 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 998 K (+725°C / +1337°F) and receiving 240.15 S⊕ (~326,846 W/m²), Kepler-245 e orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-245 is classified as a stellar host with an effective photospheric temperature of 5,174 K, a radius of 0.8 R☉, a mass of 0.86 M☉, an estimated bolometric luminosity of 0.412 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.63 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Kepler-245 shines at apparent V-band magnitude 15.546 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-245 system is a multi-planet architecture hosting 4 confirmed worlds, with Kepler-245 e sharing its stellar neighborhood alongside Kepler-245 b, Kepler-245 c, Kepler-245 d.
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-245 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,174 K |
| Stellar Radius | 0.8000 R☉ |
| Stellar Mass | 0.8600 M☉ |
| Bolometric Luminosity | 0.412 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 3.630 Gyr |
| Apparent Magnitude | V: 15.546 · G: 15.597 |
| System Architecture | 1 Star, 4 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040530 AU |
| Orbital Period | 3.22 days |
| Mean Orbital Velocity | 136.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.7200° |
| Mean Bulk Density | 1858.48 g/cm³ (359.4 km/s vesc) |
| Insolation Flux | 240.1510 S⊕ (~326,846 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2809.900 LY (861.527 pc) |