Kepler-569 b
Astrophysical Synthesis & Habitability Characterization
Kepler-569 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-569, located approximately 2081.9 light-years (638.3 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.097% across the stellar disk), this world measures 3.16 Earth radii (0.28 Jupiter radii) and has a measured mass of 10.1 Earth masses. Combining its mass and radius yields a mean bulk density of 1.76 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20 km/s.
In its orbital architecture around Kepler-569, Kepler-569 b completes one full revolution every 34.189 Earth days at a semi-major axis of 0.19784 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 63 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 526 K (+253°C / +487°F) and receiving 19.31 S⊕ (~26,286 W/m²), Kepler-569 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-569 is classified as a stellar host with an effective photospheric temperature of 5,616 K, a radius of 0.93 R☉, a mass of 0.95 M☉, an estimated bolometric luminosity of 0.772 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.9 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-569 shines at apparent V-band magnitude 14.244 (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-569 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,616 K |
| Stellar Radius | 0.9300 R☉ |
| Stellar Mass | 0.9500 M☉ |
| Bolometric Luminosity | 0.772 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | 4.900 Gyr |
| Apparent Magnitude | V: 14.244 · G: 14.082 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.197840 AU |
| Orbital Period | 34.189 days |
| Mean Orbital Velocity | 63 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9300° |
| Mean Bulk Density | 1.76 g/cm³ (20 km/s vesc) |
| Insolation Flux | 19.3140 S⊕ (~26,286 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2081.900 LY (638.301 pc) |