Kepler-1611 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1611 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1611, located approximately 2962.9 light-years (908.44 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0064% across the stellar disk), this world measures 0.81 Earth radii and has a measured mass of 0.457 Earth masses. Combining its mass and radius yields a mean bulk density of 4.74 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.7 g⊕ (6.86 m/s²), and an escape velocity of 8.4 km/s.
In its orbital architecture around Kepler-1611, Kepler-1611 b completes one full revolution every 5.176 Earth days at a semi-major axis of 0.0586 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 123.2 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 1243 K (+970°C / +1778°F) and receiving 146.22 S⊕ (~199,005 W/m²), Kepler-1611 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1611 is classified as a stellar host with an effective photospheric temperature of 5,605 K, a radius of 0.93 R☉, a mass of 0.94 M☉, an estimated bolometric luminosity of 0.766 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.01 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-1611 shines at apparent V-band magnitude 14.627 (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-1611 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,605 K |
| Stellar Radius | 0.9300 R☉ |
| Stellar Mass | 0.9400 M☉ |
| Bolometric Luminosity | 0.766 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | 5.010 Gyr |
| Apparent Magnitude | V: 14.627 · G: 14.412 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.058600 AU |
| Orbital Period | 5.176 days |
| Mean Orbital Velocity | 123.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.2600° |
| Mean Bulk Density | 4.74 g/cm³ (8.4 km/s vesc) |
| Insolation Flux | 146.2200 S⊕ (~199,005 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2962.900 LY (908.444 pc) |