Kepler-1423 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1423 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1423, located approximately 1464.4 light-years (449 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0168% across the stellar disk), this world measures 1.06 Earth radii and has a measured mass of 1.2 Earth masses. Combining its mass and radius yields a mean bulk density of 5.56 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.07 g⊕ (10.49 m/s²), and an escape velocity of 11.9 km/s.
In its orbital architecture around Kepler-1423, Kepler-1423 b completes one full revolution every 23.955 Earth days at a semi-major axis of 0.1586 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 72 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 741 K (+468°C / +874°F) and receiving 71.16 S⊕ (~96,849 W/m²), Kepler-1423 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1423 is classified as a stellar host with an effective photospheric temperature of 4,939 K, a radius of 0.75 R☉, a mass of 0.79 M☉, an estimated bolometric luminosity of 0.3 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.68 Gyr and a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-1423 shines at apparent V-band magnitude 14.721 (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-1423 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,939 K |
| Stellar Radius | 0.7500 R☉ |
| Stellar Mass | 0.7900 M☉ |
| Bolometric Luminosity | 0.3 L☉ |
| Metallicity [Fe/H] | -0.020 dex |
| Stellar Age | 4.680 Gyr |
| Apparent Magnitude | V: 14.721 · G: 14.558 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.158600 AU |
| Orbital Period | 23.955 days |
| Mean Orbital Velocity | 72 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.1200° |
| Mean Bulk Density | 5.56 g/cm³ (11.9 km/s vesc) |
| Insolation Flux | 71.1600 S⊕ (~96,849 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1464.400 LY (449.000 pc) |