Kepler-345 b
Astrophysical Synthesis & Habitability Characterization
Kepler-345 b is a confirmed sub-earth exoplanet orbiting the star Kepler-345, located approximately 848 light-years (260 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0119% across the stellar disk), this world measures 0.74 Earth radii and has a measured mass of 0.48 Earth masses. Combining its mass and radius yields a mean bulk density of 6.53 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 0.88 g⊕ (8.63 m/s²), and an escape velocity of 9 km/s.
In its orbital architecture around Kepler-345, Kepler-345 b completes one full revolution every 7.416 Earth days at a semi-major axis of 0.066 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 96.8 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 622 K (+349°C / +660°F) and receiving 35.37 S⊕ (~48,139 W/m²), Kepler-345 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-345 is classified as a stellar host with an effective photospheric temperature of 4,504 K, a radius of 0.623 R☉, a mass of 0.61 M☉, an estimated bolometric luminosity of 0.143 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.75 Gyr and a metallicity of [Fe/H] = 0.191 dex (metal-rich relative to the Sun). From Earth, Kepler-345 shines at apparent V-band magnitude 14.344 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-345 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-345 b sharing its stellar neighborhood alongside Kepler-345 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-345 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,504 K |
| Stellar Radius | 0.6230 R☉ |
| Stellar Mass | 0.6100 M☉ |
| Bolometric Luminosity | 0.143 L☉ |
| Metallicity [Fe/H] | 0.191 dex |
| Stellar Age | 2.750 Gyr |
| Apparent Magnitude | V: 14.344 · G: 14.034 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.066000 AU |
| Orbital Period | 7.416 days |
| Mean Orbital Velocity | 96.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.0500° |
| Mean Bulk Density | 6.53 g/cm³ (9 km/s vesc) |
| Insolation Flux | 35.3700 S⊕ (~48,139 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 848.000 LY (260.000 pc) |