Kepler-1793 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1793 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1793, located approximately 3880.9 light-years (1189.88 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.2068% across the stellar disk), this world measures 3.79 Earth radii (0.34 Jupiter radii) and has a measured mass of 13.8 Earth masses. Combining its mass and radius yields a mean bulk density of 1.4 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.96 g⊕ (9.41 m/s²), and an escape velocity of 21.3 km/s.
In its orbital architecture around Kepler-1793, Kepler-1793 b completes one full revolution every 8.78 Earth days at a semi-major axis of 0.0787 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 97.5 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 713 K (+440°C / +824°F) and receiving 61.24 S⊕ (~83,348 W/m²), Kepler-1793 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1793 is classified as a stellar host with an effective photospheric temperature of 5,191 K, a radius of 0.764 R☉, a mass of 0.85 M☉, an estimated bolometric luminosity of 0.38 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.6 Gyr and a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, Kepler-1793 shines at apparent V-band magnitude 15.949 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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-1793 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,191 K |
| Stellar Radius | 0.7640 R☉ |
| Stellar Mass | 0.8500 M☉ |
| Bolometric Luminosity | 0.38 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | 3.600 Gyr |
| Apparent Magnitude | V: 15.949 · G: 15.900 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.078700 AU |
| Orbital Period | 8.78 days |
| Mean Orbital Velocity | 97.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.5400° |
| Mean Bulk Density | 1.4 g/cm³ (21.3 km/s vesc) |
| Insolation Flux | 61.2400 S⊕ (~83,348 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3880.900 LY (1189.880 pc) |