Kepler-758 c
Astrophysical Synthesis & Habitability Characterization
Kepler-758 c is a confirmed super-earth exoplanet orbiting the star Kepler-758, located approximately 4899.9 light-years (1502.32 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0119% across the stellar disk), this world measures 1.69 Earth radii and has a measured mass of 3.5 Earth masses. Combining its mass and radius yields a mean bulk density of 4 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.23 g⊕ (12.06 m/s²), and an escape velocity of 16.1 km/s.
In its orbital architecture around Kepler-758, Kepler-758 c completes one full revolution every 4.758 Earth days at a semi-major axis of 0.05768 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 131.9 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 1372 K (+1099°C / +2010°F) and receiving 1,211.82 S⊕ (~1,649,290 W/m²), Kepler-758 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-758 is classified as a stellar host with an effective photospheric temperature of 6,228 K, a radius of 1.42 R☉, a mass of 1.16 M☉, an estimated bolometric luminosity of 2.722 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.8 Gyr and a metallicity of [Fe/H] = -0.1 dex (near-solar heavy-element abundance). From Earth, Kepler-758 shines at apparent V-band magnitude 14.379 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-758 system is a multi-planet architecture hosting 4 confirmed worlds, with Kepler-758 c sharing its stellar neighborhood alongside Kepler-758 e, Kepler-758 b, Kepler-758 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-758 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,228 K |
| Stellar Radius | 1.4200 R☉ |
| Stellar Mass | 1.1600 M☉ |
| Bolometric Luminosity | 2.722 L☉ |
| Metallicity [Fe/H] | -0.100 dex |
| Stellar Age | 3.800 Gyr |
| Apparent Magnitude | V: 14.379 · G: 14.327 |
| System Architecture | 1 Star, 4 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.057680 AU |
| Orbital Period | 4.758 days |
| Mean Orbital Velocity | 131.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 84.3100° |
| Mean Bulk Density | 4 g/cm³ (16.1 km/s vesc) |
| Insolation Flux | 1211.8220 S⊕ (~1,649,290 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4899.900 LY (1502.320 pc) |