Kepler-563 b
Astrophysical Synthesis & Habitability Characterization
Kepler-563 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-563, located approximately 1843.5 light-years (565.21 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.1354% across the stellar disk), this world measures 3.09 Earth radii (0.28 Jupiter radii) and has a measured mass of 9.75 Earth masses. Combining its mass and radius yields a mean bulk density of 1.82 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-563, Kepler-563 b completes one full revolution every 22.184 Earth days at a semi-major axis of 0.1418 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 69.5 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 546 K (+273°C / +523°F) and receiving 18.74 S⊕ (~25,502 W/m²), Kepler-563 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-563 is classified as a stellar host with an effective photospheric temperature of 5,066 K, a radius of 0.77 R☉, a mass of 0.8 M☉, an estimated bolometric luminosity of 0.35 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.37 Gyr and a metallicity of [Fe/H] = -0.08 dex (near-solar heavy-element abundance). From Earth, Kepler-563 shines at apparent V-band magnitude 14.901 (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-563 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,066 K |
| Stellar Radius | 0.7700 R☉ |
| Stellar Mass | 0.8000 M☉ |
| Bolometric Luminosity | 0.35 L☉ |
| Metallicity [Fe/H] | -0.080 dex |
| Stellar Age | 5.370 Gyr |
| Apparent Magnitude | V: 14.901 · G: 14.739 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.141800 AU |
| Orbital Period | 22.184 days |
| Mean Orbital Velocity | 69.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9700° |
| Mean Bulk Density | 1.82 g/cm³ (19.9 km/s vesc) |
| Insolation Flux | 18.7380 S⊕ (~25,502 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1843.500 LY (565.207 pc) |