Kepler-764 b
Astrophysical Synthesis & Habitability Characterization
Kepler-764 b is a confirmed super-earth exoplanet orbiting the star Kepler-764, located approximately 3417.6 light-years (1047.84 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0285% across the stellar disk), this world measures 1.64 Earth radii and has a measured mass of 3.33 Earth masses. Combining its mass and radius yields a mean bulk density of 4.16 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.24 g⊕ (12.16 m/s²), and an escape velocity of 15.9 km/s.
In its orbital architecture around Kepler-764, Kepler-764 b completes one full revolution every 7.337 Earth days at a semi-major axis of 0.0724 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 107.4 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 875 K (+602°C / +1116°F) and receiving 160.46 S⊕ (~218,382 W/m²), Kepler-764 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-764 is classified as a stellar host with an effective photospheric temperature of 5,557 K, a radius of 0.89 R☉, a mass of 0.92 M☉, an estimated bolometric luminosity of 0.678 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.17 Gyr and a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, Kepler-764 shines at apparent V-band magnitude 15.555 (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-764 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,557 K |
| Stellar Radius | 0.8900 R☉ |
| Stellar Mass | 0.9200 M☉ |
| Bolometric Luminosity | 0.678 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | 4.170 Gyr |
| Apparent Magnitude | V: 15.555 · G: 15.300 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.072400 AU |
| Orbital Period | 7.337 days |
| Mean Orbital Velocity | 107.4 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9300° |
| Mean Bulk Density | 4.16 g/cm³ (15.9 km/s vesc) |
| Insolation Flux | 160.4570 S⊕ (~218,382 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3417.600 LY (1047.840 pc) |