Kepler-1375 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1375 b is a confirmed super-earth exoplanet orbiting the star Kepler-1375, located approximately 4666.8 light-years (1430.84 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.008% across the stellar disk), this world measures 1.74 Earth radii and has a measured mass of 3.68 Earth masses. Combining its mass and radius yields a mean bulk density of 3.85 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.22 g⊕ (11.96 m/s²), and an escape velocity of 16.3 km/s.
In its orbital architecture around Kepler-1375, Kepler-1375 b completes one full revolution every 3.3 Earth days at a semi-major axis of 0.0471 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 155.3 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 1543 K (+1270°C / +2318°F) and receiving 2,948.36 S⊕ (~4,012,721 W/m²), Kepler-1375 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1375 is classified as a stellar host with an effective photospheric temperature of 6,704 K, a radius of 1.78 R☉, a mass of 1.47 M☉, an estimated bolometric luminosity of 5.742 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.66 Gyr and a metallicity of [Fe/H] = 0.09 dex (metal-rich relative to the Sun). From Earth, Kepler-1375 shines at apparent V-band magnitude 13.864 (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-1375 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,704 K |
| Stellar Radius | 1.7800 R☉ |
| Stellar Mass | 1.4700 M☉ |
| Bolometric Luminosity | 5.742 L☉ |
| Metallicity [Fe/H] | 0.090 dex |
| Stellar Age | 1.660 Gyr |
| Apparent Magnitude | V: 13.864 · G: 13.710 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.047100 AU |
| Orbital Period | 3.3 days |
| Mean Orbital Velocity | 155.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9200° |
| Mean Bulk Density | 3.85 g/cm³ (16.3 km/s vesc) |
| Insolation Flux | 2948.3620 S⊕ (~4,012,721 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4666.800 LY (1430.840 pc) |