Kepler-893 b
Astrophysical Synthesis & Habitability Characterization
Kepler-893 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-893, located approximately 4193 light-years (1285.59 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0787% across the stellar disk), this world measures 3.03 Earth radii (0.27 Jupiter radii) and has a measured mass of 9.43 Earth masses. Combining its mass and radius yields a mean bulk density of 1.87 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.03 g⊕ (10.1 m/s²), and an escape velocity of 19.7 km/s.
In its orbital architecture around Kepler-893, Kepler-893 b completes one full revolution every 6.339 Earth days at a semi-major axis of 0.0699 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 120 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 1034 K (+761°C / +1402°F) and receiving 266.27 S⊕ (~362,395 W/m²), Kepler-893 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-893 is classified as a stellar host with an effective photospheric temperature of 5,820 K, a radius of 0.99 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 1.009 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.8 Gyr and a metallicity of [Fe/H] = -0.03 dex (near-solar heavy-element abundance). From Earth, Kepler-893 shines at apparent V-band magnitude 15.347 (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-893 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,820 K |
| Stellar Radius | 0.9900 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 1.009 L☉ |
| Metallicity [Fe/H] | -0.030 dex |
| Stellar Age | 3.800 Gyr |
| Apparent Magnitude | V: 15.347 · G: 15.174 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.069900 AU |
| Orbital Period | 6.339 days |
| Mean Orbital Velocity | 120 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 82.4200° |
| Mean Bulk Density | 1.87 g/cm³ (19.7 km/s vesc) |
| Insolation Flux | 266.2710 S⊕ (~362,395 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4193.000 LY (1285.590 pc) |