Kepler-1899 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1899 b is a confirmed super-earth exoplanet orbiting the star Kepler-1899, located approximately 2320.6 light-years (711.51 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0367% across the stellar disk), this world measures 1.551 Earth radii and has a measured mass of 3.02 Earth masses. Combining its mass and radius yields a mean bulk density of 4.46 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.26 g⊕ (12.36 m/s²), and an escape velocity of 15.6 km/s.
In its orbital architecture around Kepler-1899, Kepler-1899 b completes one full revolution every 4.096 Earth days at a semi-major axis of 0.0457 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 121.4 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 851 K (+578°C / +1072°F) and receiving 124.30 S⊕ (~169,172 W/m²), Kepler-1899 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1899 is classified as a stellar host with an effective photospheric temperature of 4,791 K, a radius of 0.742 R☉, a mass of 0.759 M☉, an estimated bolometric luminosity of 0.26 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.9 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, Kepler-1899 shines at apparent V-band magnitude 16.136 (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-1899 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,791 K |
| Stellar Radius | 0.7420 R☉ |
| Stellar Mass | 0.7590 M☉ |
| Bolometric Luminosity | 0.26 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | 13.900 Gyr |
| Apparent Magnitude | V: 16.136 · G: 15.949 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.045700 AU |
| Orbital Period | 4.096 days |
| Mean Orbital Velocity | 121.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.6000° |
| Mean Bulk Density | 4.46 g/cm³ (15.6 km/s vesc) |
| Insolation Flux | 124.3000 S⊕ (~169,172 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2320.600 LY (711.509 pc) |