Kepler-365 c
Astrophysical Synthesis & Habitability Characterization
Kepler-365 c is a confirmed super-earth exoplanet orbiting the star Kepler-365, located approximately 3388.7 light-years (1038.99 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0206% across the stellar disk), this world measures 1.64 Earth radii and has a measured mass of 3.33 Earth masses. Combining its mass and radius yields a mean bulk density of 4.16 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 15.9 km/s.
In its orbital architecture around Kepler-365, Kepler-365 c completes one full revolution every 17.784 Earth days at a semi-major axis of 0.137 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 83.8 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 729 K (+456°C / +853°F) and receiving 66.87 S⊕ (~91,010 W/m²), Kepler-365 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-365 is classified as a stellar host with an effective photospheric temperature of 6,012 K, a radius of 1.048 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 1.287 L☉. Stellar evolution modeling indicates an estimated stellar age of 4 Gyr and a metallicity of [Fe/H] = -0.218 dex (metal-poor relative to the Sun). From Earth, Kepler-365 shines at apparent V-band magnitude 14.771 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-365 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-365 c sharing its stellar neighborhood alongside Kepler-365 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-365 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,012 K |
| Stellar Radius | 1.0480 R☉ |
| Stellar Mass | 1.0200 M☉ |
| Bolometric Luminosity | 1.287 L☉ |
| Metallicity [Fe/H] | -0.218 dex |
| Stellar Age | 4.000 Gyr |
| Apparent Magnitude | V: 14.771 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.137000 AU |
| Orbital Period | 17.784 days |
| Mean Orbital Velocity | 83.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8100° |
| Mean Bulk Density | 4.16 g/cm³ (15.9 km/s vesc) |
| Insolation Flux | 66.8700 S⊕ (~91,010 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3388.700 LY (1038.990 pc) |