Kepler-765 b
Astrophysical Synthesis & Habitability Characterization
Kepler-765 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-765, located approximately 3510.4 light-years (1076.28 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0442% across the stellar disk), this world measures 2.43 Earth radii and has a measured mass of 6.48 Earth masses. Combining its mass and radius yields a mean bulk density of 2.49 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.1 g⊕ (10.79 m/s²), and an escape velocity of 18.3 km/s.
In its orbital architecture around Kepler-765, Kepler-765 b completes one full revolution every 27.666 Earth days at a semi-major axis of 0.1754 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 69 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 641 K (+368°C / +694°F) and receiving 48.95 S⊕ (~66,617 W/m²), Kepler-765 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-765 is classified as a stellar host with an effective photospheric temperature of 5,901 K, a radius of 1.06 R☉, a mass of 1.05 M☉, an estimated bolometric luminosity of 1.222 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.72 Gyr and a metallicity of [Fe/H] = 0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-765 shines at apparent V-band magnitude 14.709 (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-765 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,901 K |
| Stellar Radius | 1.0600 R☉ |
| Stellar Mass | 1.0500 M☉ |
| Bolometric Luminosity | 1.222 L☉ |
| Metallicity [Fe/H] | 0.040 dex |
| Stellar Age | 3.720 Gyr |
| Apparent Magnitude | V: 14.709 · G: 14.600 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.175400 AU |
| Orbital Period | 27.666 days |
| Mean Orbital Velocity | 69 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9900° |
| Mean Bulk Density | 2.49 g/cm³ (18.3 km/s vesc) |
| Insolation Flux | 48.9470 S⊕ (~66,617 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3510.400 LY (1076.280 pc) |