Kepler-1675 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1675 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1675, located approximately 2123.7 light-years (651.12 parsecs) from the Solar System. First announced in 2020 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0644% across the stellar disk), this world measures 3.125 Earth radii (0.28 Jupiter radii) and has a measured mass of 9.93 Earth masses. Combining its mass and radius yields a mean bulk density of 1.79 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.02 g⊕ (10 m/s²), and an escape velocity of 19.9 km/s.
In its orbital architecture around Kepler-1675, Kepler-1675 b completes one full revolution every 63.038 Earth days at a semi-major axis of 0.32185 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 55.5 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 465 K (+192°C / +378°F) and receiving 11.80 S⊕ (~16,060 W/m²), Kepler-1675 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1675 is classified as a stellar host with an effective photospheric temperature of 5,853 K, a radius of 1.1287 R☉, a mass of 1.06 M☉, an estimated bolometric luminosity of 1.341 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.7 Gyr and a metallicity of [Fe/H] = 0.254 dex (metal-rich relative to the Sun). From Earth, Kepler-1675 shines at apparent V-band magnitude 13.672 (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-1675 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,853 K |
| Stellar Radius | 1.1287 R☉ |
| Stellar Mass | 1.0600 M☉ |
| Bolometric Luminosity | 1.341 L☉ |
| Metallicity [Fe/H] | 0.254 dex |
| Stellar Age | 1.700 Gyr |
| Apparent Magnitude | V: 13.672 · G: 13.554 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.321850 AU |
| Orbital Period | 63.038 days |
| Mean Orbital Velocity | 55.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9800° |
| Mean Bulk Density | 1.79 g/cm³ (19.9 km/s vesc) |
| Insolation Flux | 11.8000 S⊕ (~16,060 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2123.700 LY (651.117 pc) |