Kepler-347 c
Astrophysical Synthesis & Habitability Characterization
Kepler-347 c is a confirmed super-earth exoplanet orbiting the star Kepler-347, located approximately 4236.4 light-years (1298.88 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0255% across the stellar disk), this world measures 1.75 Earth radii and has a measured mass of 3.71 Earth masses. Combining its mass and radius yields a mean bulk density of 3.82 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.21 g⊕ (11.87 m/s²), and an escape velocity of 16.3 km/s.
In its orbital architecture around Kepler-347, Kepler-347 c completes one full revolution every 27.321 Earth days at a semi-major axis of 0.183 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 72.9 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 705 K (+432°C / +810°F) and receiving 65.71 S⊕ (~89,427 W/m²), Kepler-347 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-347 is classified as a stellar host with an effective photospheric temperature of 6,088 K, a radius of 1.005 R☉, a mass of 0.922 M☉, an estimated bolometric luminosity of 1.245 L☉. Stellar evolution modeling indicates an estimated stellar age of 11.75 Gyr and a metallicity of [Fe/H] = -0.14 dex (metal-poor relative to the Sun). From Earth, Kepler-347 shines at apparent V-band magnitude 14.567 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-347 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-347 c sharing its stellar neighborhood alongside Kepler-347 b, Kepler-347 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-347 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,088 K |
| Stellar Radius | 1.0050 R☉ |
| Stellar Mass | 0.9220 M☉ |
| Bolometric Luminosity | 1.245 L☉ |
| Metallicity [Fe/H] | -0.140 dex |
| Stellar Age | 11.750 Gyr |
| Apparent Magnitude | V: 14.567 · G: 14.489 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.183000 AU |
| Orbital Period | 27.321 days |
| Mean Orbital Velocity | 72.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 85.3900° |
| Mean Bulk Density | 3.82 g/cm³ (16.3 km/s vesc) |
| Insolation Flux | 65.7070 S⊕ (~89,427 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4236.400 LY (1298.880 pc) |