Kepler-1894 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1894 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1894, located approximately 3050.2 light-years (935.19 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0149% across the stellar disk), this world measures 1.201 Earth radii and has a measured mass of 1.87 Earth masses. Combining its mass and radius yields a mean bulk density of 5.95 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 14 km/s.
In its orbital architecture around Kepler-1894, Kepler-1894 b completes one full revolution every 2.763 Earth days at a semi-major axis of 0.0385 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 151.6 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 1231 K (+958°C / +1756°F) and receiving 544.05 S⊕ (~740,452 W/m²), Kepler-1894 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1894 is classified as a stellar host with an effective photospheric temperature of 5,772 K, a radius of 0.901 R☉, a mass of 0.999 M☉, an estimated bolometric luminosity of 0.808 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.5 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, Kepler-1894 shines at apparent V-band magnitude 15.452 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1894 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1894 b sharing its stellar neighborhood alongside Kepler-1894 c.
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-1894 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,772 K |
| Stellar Radius | 0.9010 R☉ |
| Stellar Mass | 0.9990 M☉ |
| Bolometric Luminosity | 0.808 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 0.500 Gyr |
| Apparent Magnitude | V: 15.452 · G: 15.363 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.038500 AU |
| Orbital Period | 2.763 days |
| Mean Orbital Velocity | 151.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.4800° |
| Mean Bulk Density | 5.95 g/cm³ (14 km/s vesc) |
| Insolation Flux | 544.0500 S⊕ (~740,452 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3050.200 LY (935.191 pc) |