Kepler-719 b
Astrophysical Synthesis & Habitability Characterization
Kepler-719 b is a confirmed gas giant exoplanet orbiting the star Kepler-719, located approximately 8145.8 light-years (2497.51 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.6353% across the stellar disk), this world measures 8.52 Earth radii (0.76 Jupiter radii) and has a measured mass of 54.5 Earth masses (0.17 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.49 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.75 g⊕ (7.35 m/s²), and an escape velocity of 28.3 km/s.
In its orbital architecture around Kepler-719, Kepler-719 b completes one full revolution every 5.007 Earth days at a semi-major axis of 0.0556 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 120.8 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 998 K (+725°C / +1337°F) and receiving 234.28 S⊕ (~318,855 W/m²), Kepler-719 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-719 is classified as a stellar host with an effective photospheric temperature of 5,777 K, a radius of 0.98 R☉, a mass of 0.99 M☉, an estimated bolometric luminosity of 0.96 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.98 Gyr and a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-719 shines at apparent V-band magnitude 16.128 (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-719 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,777 K |
| Stellar Radius | 0.9800 R☉ |
| Stellar Mass | 0.9900 M☉ |
| Bolometric Luminosity | 0.96 L☉ |
| Metallicity [Fe/H] | -0.020 dex |
| Stellar Age | 3.980 Gyr |
| Apparent Magnitude | V: 16.128 · G: 15.904 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.055600 AU |
| Orbital Period | 5.007 days |
| Mean Orbital Velocity | 120.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.8700° |
| Mean Bulk Density | 0.49 g/cm³ (28.3 km/s vesc) |
| Insolation Flux | 234.2800 S⊕ (~318,855 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 8145.800 LY (2497.510 pc) |