Kepler-353 c
Astrophysical Synthesis & Habitability Characterization
Kepler-353 c is a confirmed super-earth exoplanet orbiting the star Kepler-353, located approximately 1254.7 light-years (384.69 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.063% across the stellar disk), this world measures 1.38 Earth radii and has a measured mass of 2.48 Earth masses. Combining its mass and radius yields a mean bulk density of 5.2 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.3 g⊕ (12.75 m/s²), and an escape velocity of 15 km/s.
In its orbital architecture around Kepler-353, Kepler-353 c completes one full revolution every 8.411 Earth days at a semi-major axis of 0.065 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 84.1 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 472 K (+199°C / +390°F) and receiving 16.56 S⊕ (~22,540 W/m²), Kepler-353 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-353 is classified as a stellar host with an effective photospheric temperature of 3,903 K, a radius of 0.504 R☉, a mass of 0.553 M☉, an estimated bolometric luminosity of 0.053 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.59 Gyr and a metallicity of [Fe/H] = -0.12 dex (metal-poor relative to the Sun). From Earth, Kepler-353 shines at apparent V-band magnitude 16.126 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-353 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-353 c sharing its stellar neighborhood alongside Kepler-353 b.
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-353 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,903 K |
| Stellar Radius | 0.5040 R☉ |
| Stellar Mass | 0.5530 M☉ |
| Bolometric Luminosity | 0.053 L☉ |
| Metallicity [Fe/H] | -0.120 dex |
| Stellar Age | 4.590 Gyr |
| Apparent Magnitude | V: 16.126 · G: 15.725 |
| System Architecture | 2 Stars, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.065000 AU |
| Orbital Period | 8.411 days |
| Mean Orbital Velocity | 84.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 85.9900° |
| Mean Bulk Density | 5.2 g/cm³ (15 km/s vesc) |
| Insolation Flux | 16.5610 S⊕ (~22,540 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1254.700 LY (384.694 pc) |