Kepler-1923 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1923 b is a confirmed super-earth exoplanet orbiting the star Kepler-1923, located approximately 3231.7 light-years (990.84 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0193% across the stellar disk), this world measures 1.96 Earth radii and has a measured mass of 4.5 Earth masses. Combining its mass and radius yields a mean bulk density of 3.3 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.17 g⊕ (11.47 m/s²), and an escape velocity of 16.9 km/s.
In its orbital architecture around Kepler-1923, Kepler-1923 b completes one full revolution every 52.61 Earth days at a semi-major axis of 0.2846 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 58.9 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 553 K (+280°C / +536°F) and receiving 8.63 S⊕ (~11,745 W/m²), Kepler-1923 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1923 is classified as a stellar host with an effective photospheric temperature of 5,881 K, a radius of 1.294 R☉, a mass of 1.109 M☉, an estimated bolometric luminosity of 1.797 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1923 shines at apparent V-band magnitude 14.454 (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-1923 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,881 K |
| Stellar Radius | 1.2940 R☉ |
| Stellar Mass | 1.1090 M☉ |
| Bolometric Luminosity | 1.797 L☉ |
| Metallicity [Fe/H] | 0.160 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.454 · G: 14.231 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.284600 AU |
| Orbital Period | 52.61 days |
| Mean Orbital Velocity | 58.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8800° |
| Mean Bulk Density | 3.3 g/cm³ (16.9 km/s vesc) |
| Insolation Flux | 8.6300 S⊕ (~11,745 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3231.700 LY (990.838 pc) |