Kepler-1619 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1619 b is a confirmed sub-earth exoplanet orbiting the star Kepler-1619, located approximately 2396.8 light-years (734.85 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0049% across the stellar disk), this world measures 0.76 Earth radii and has a measured mass of 0.363 Earth masses. Combining its mass and radius yields a mean bulk density of 4.56 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.63 g⊕ (6.18 m/s²), and an escape velocity of 7.7 km/s.
In its orbital architecture around Kepler-1619, Kepler-1619 b completes one full revolution every 23.623 Earth days at a semi-major axis of 0.15413 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 71 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 797 K (+524°C / +975°F) and receiving 74.64 S⊕ (~101,578 W/m²), Kepler-1619 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1619 is classified as a stellar host with an effective photospheric temperature of 5,852 K, a radius of 1 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 1.052 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.27 Gyr and a metallicity of [Fe/H] = -0.07 dex (near-solar heavy-element abundance). From Earth, Kepler-1619 shines at apparent V-band magnitude 13.438 (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-1619 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,852 K |
| Stellar Radius | 1.0000 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 1.052 L☉ |
| Metallicity [Fe/H] | -0.070 dex |
| Stellar Age | 4.270 Gyr |
| Apparent Magnitude | V: 13.438 · G: 13.299 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.154130 AU |
| Orbital Period | 23.623 days |
| Mean Orbital Velocity | 71 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.1400° |
| Mean Bulk Density | 4.56 g/cm³ (7.7 km/s vesc) |
| Insolation Flux | 74.6350 S⊕ (~101,578 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2396.800 LY (734.850 pc) |