Kepler-713 b
Astrophysical Synthesis & Habitability Characterization
Kepler-713 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-713, located approximately 3554.7 light-years (1089.87 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0527% across the stellar disk), this world measures 2.48 Earth radii and has a measured mass of 6.71 Earth masses. Combining its mass and radius yields a mean bulk density of 2.43 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.09 g⊕ (10.69 m/s²), and an escape velocity of 18.4 km/s.
In its orbital architecture around Kepler-713, Kepler-713 b completes one full revolution every 7.411 Earth days at a semi-major axis of 0.0748 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 109.8 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 905 K (+632°C / +1170°F) and receiving 228.28 S⊕ (~310,693 W/m²), Kepler-713 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-713 is classified as a stellar host with an effective photospheric temperature of 5,785 K, a radius of 0.99 R☉, a mass of 0.98 M☉, an estimated bolometric luminosity of 0.985 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.8 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-713 shines at apparent V-band magnitude 15.171 (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-713 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,785 K |
| Stellar Radius | 0.9900 R☉ |
| Stellar Mass | 0.9800 M☉ |
| Bolometric Luminosity | 0.985 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | 3.800 Gyr |
| Apparent Magnitude | V: 15.171 · G: 15.019 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.074800 AU |
| Orbital Period | 7.411 days |
| Mean Orbital Velocity | 109.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.5400° |
| Mean Bulk Density | 2.43 g/cm³ (18.4 km/s vesc) |
| Insolation Flux | 228.2830 S⊕ (~310,693 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3554.700 LY (1089.870 pc) |