Kepler-763 d
Astrophysical Synthesis & Habitability Characterization
Kepler-763 d is a confirmed super-earth exoplanet orbiting the star Kepler-763, located approximately 3139.1 light-years (962.46 parsecs) from the Solar System. First announced in 2023 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.033% across the stellar disk), this world measures 1.67 Earth radii and has a measured mass of 3.43 Earth masses. Combining its mass and radius yields a mean bulk density of 4.06 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.23 g⊕ (12.06 m/s²), and an escape velocity of 16 km/s.
In its orbital architecture around Kepler-763, Kepler-763 d completes one full revolution every 6.503 Earth days at a semi-major axis of 0.0634 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 106.1 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 804 K (+531°C / +988°F) and receiving 98.81 S⊕ (~134,480 W/m²), Kepler-763 d orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-763 is classified as a stellar host with an effective photospheric temperature of 4,999 K, a radius of 0.843 R☉, a mass of 0.8 M☉, an estimated bolometric luminosity of 0.398 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.1 Gyr and a metallicity of [Fe/H] = 0.18 dex (metal-rich relative to the Sun). From Earth, Kepler-763 shines at apparent V-band magnitude 15.965 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-763 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-763 d sharing its stellar neighborhood alongside Kepler-763 b, Kepler-763 c.
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-763 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,999 K |
| Stellar Radius | 0.8430 R☉ |
| Stellar Mass | 0.8000 M☉ |
| Bolometric Luminosity | 0.398 L☉ |
| Metallicity [Fe/H] | 0.180 dex |
| Stellar Age | 2.100 Gyr |
| Apparent Magnitude | V: 15.965 · G: 15.682 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.063400 AU |
| Orbital Period | 6.503 days |
| Mean Orbital Velocity | 106.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.7600° |
| Mean Bulk Density | 4.06 g/cm³ (16 km/s vesc) |
| Insolation Flux | 98.8100 S⊕ (~134,480 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3139.100 LY (962.459 pc) |