Kepler-1679 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1679 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1679, located approximately 2965.7 light-years (909.28 parsecs) from the Solar System. First announced in 2020 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0472% across the stellar disk), this world measures 2.069 Earth radii and has a measured mass of 4.93 Earth masses. Combining its mass and radius yields a mean bulk density of 3.07 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.15 g⊕ (11.28 m/s²), and an escape velocity of 17.3 km/s.
In its orbital architecture around Kepler-1679, Kepler-1679 b completes one full revolution every 9.754 Earth days at a semi-major axis of 0.0892 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 99.5 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 813 K (+540°C / +1004°F) and receiving 103.30 S⊕ (~140,591 W/m²), Kepler-1679 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1679 is classified as a stellar host with an effective photospheric temperature of 5,501 K, a radius of 0.8732 R☉, a mass of 0.96 M☉, an estimated bolometric luminosity of 0.626 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.4 Gyr and a metallicity of [Fe/H] = -0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-1679 shines at apparent V-band magnitude 15.327 (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-1679 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,501 K |
| Stellar Radius | 0.8732 R☉ |
| Stellar Mass | 0.9600 M☉ |
| Bolometric Luminosity | 0.626 L☉ |
| Metallicity [Fe/H] | -0.040 dex |
| Stellar Age | 0.400 Gyr |
| Apparent Magnitude | V: 15.327 · G: 15.114 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.089200 AU |
| Orbital Period | 9.754 days |
| Mean Orbital Velocity | 99.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.4500° |
| Mean Bulk Density | 3.07 g/cm³ (17.3 km/s vesc) |
| Insolation Flux | 103.3000 S⊕ (~140,591 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2965.700 LY (909.280 pc) |