Kepler-350 c
Astrophysical Synthesis & Habitability Characterization
Kepler-350 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-350, located approximately 3120.9 light-years (956.86 parsecs) from the Solar System. First announced in 2013 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0517% across the stellar disk), this world measures 3.1 Earth radii (0.28 Jupiter radii) and has a measured mass of 6.1 Earth masses. Combining its mass and radius yields a mean bulk density of 1.13 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.63 g⊕ (6.18 m/s²), and an escape velocity of 15.7 km/s.
In its orbital architecture around Kepler-350, Kepler-350 c completes one full revolution every 17.849 Earth days at a semi-major axis of 0.1385 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 84.4 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 888 K (+615°C / +1139°F) and receiving 138.42 S⊕ (~188,383 W/m²), Kepler-350 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-350 is classified as a stellar host with an effective photospheric temperature of 6,492 K, a radius of 1.25 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 2.49 L☉. Stellar evolution modeling indicates an estimated stellar age of 4 Gyr and a metallicity of [Fe/H] = 0.041 dex (near-solar heavy-element abundance). From Earth, Kepler-350 shines at apparent V-band magnitude 13.965 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-350 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-350 c sharing its stellar neighborhood alongside Kepler-350 b, Kepler-350 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-350 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,492 K |
| Stellar Radius | 1.2500 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 2.49 L☉ |
| Metallicity [Fe/H] | 0.041 dex |
| Stellar Age | 4.000 Gyr |
| Apparent Magnitude | V: 13.965 · G: 13.761 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.138500 AU |
| Orbital Period | 17.849 days |
| Mean Orbital Velocity | 84.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.2900° |
| Mean Bulk Density | 1.13 g/cm³ (15.7 km/s vesc) |
| Insolation Flux | 138.4150 S⊕ (~188,383 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3120.900 LY (956.859 pc) |