Kepler-619 b
Astrophysical Synthesis & Habitability Characterization
Kepler-619 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-619, located approximately 2937.6 light-years (900.68 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0681% 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-619, Kepler-619 b completes one full revolution every 5.404 Earth days at a semi-major axis of 0.06014 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 121.1 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 1073 K (+800°C / +1472°F) and receiving 224.15 S⊕ (~305,063 W/m²), Kepler-619 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-619 is classified as a stellar host with an effective photospheric temperature of 5,980 K, a radius of 1.11 R☉, a mass of 1.09 M☉, an estimated bolometric luminosity of 1.414 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.47 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Kepler-619 shines at apparent V-band magnitude 14.84 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-619 system is a multi-planet architecture hosting 3 confirmed worlds, with Kepler-619 b sharing its stellar neighborhood alongside Kepler-619 c, Kepler-619 d.
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-619 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,980 K |
| Stellar Radius | 1.1100 R☉ |
| Stellar Mass | 1.0900 M☉ |
| Bolometric Luminosity | 1.414 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 3.470 Gyr |
| Apparent Magnitude | V: 14.840 · G: 14.670 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.060140 AU |
| Orbital Period | 5.404 days |
| Mean Orbital Velocity | 121.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.2000° |
| Mean Bulk Density | 1.76 g/cm³ (20 km/s vesc) |
| Insolation Flux | 224.1460 S⊕ (~305,063 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2937.600 LY (900.678 pc) |