Kepler-1693 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1693 c is a confirmed terrestrial exoplanet orbiting the star Kepler-1693, located approximately 2479 light-years (760.07 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0067% across the stellar disk), this world measures 0.977 Earth radii and has a measured mass of 0.894 Earth masses. Combining its mass and radius yields a mean bulk density of 5.29 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.94 g⊕ (9.22 m/s²), and an escape velocity of 10.7 km/s.
In its orbital architecture around Kepler-1693, Kepler-1693 c completes one full revolution every 5.364 Earth days at a semi-major axis of 0.0588 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 119.3 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 1059 K (+786°C / +1447°F) and receiving 296.73 S⊕ (~403,850 W/m²), Kepler-1693 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1693 is classified as a stellar host with an effective photospheric temperature of 5,553 K, a radius of 1.098 R☉, a mass of 0.941 M☉, an estimated bolometric luminosity of 1.029 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.8 Gyr and a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1693 shines at apparent V-band magnitude 14.857 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1693 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1693 c sharing its stellar neighborhood alongside Kepler-1693 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-1693 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,553 K |
| Stellar Radius | 1.0980 R☉ |
| Stellar Mass | 0.9410 M☉ |
| Bolometric Luminosity | 1.029 L☉ |
| Metallicity [Fe/H] | 0.160 dex |
| Stellar Age | 0.800 Gyr |
| Apparent Magnitude | V: 14.857 · G: 14.744 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.058800 AU |
| Orbital Period | 5.364 days |
| Mean Orbital Velocity | 119.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9700° |
| Mean Bulk Density | 5.29 g/cm³ (10.7 km/s vesc) |
| Insolation Flux | 296.7300 S⊕ (~403,850 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2479.000 LY (760.065 pc) |