Kepler-1759 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1759 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1759, located approximately 1256.8 light-years (385.35 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0108% across the stellar disk), this world measures 0.904 Earth radii and has a measured mass of 0.676 Earth masses. Combining its mass and radius yields a mean bulk density of 5.05 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.83 g⊕ (8.14 m/s²), and an escape velocity of 9.7 km/s.
In its orbital architecture around Kepler-1759, Kepler-1759 b completes one full revolution every 3.72 Earth days at a semi-major axis of 0.0429 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 125.5 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 954 K (+681°C / +1258°F) and receiving 195.70 S⊕ (~266,348 W/m²), Kepler-1759 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1759 is classified as a stellar host with an effective photospheric temperature of 5,017 K, a radius of 0.797 R☉, a mass of 0.76 M☉, an estimated bolometric luminosity of 0.361 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.8 Gyr and a metallicity of [Fe/H] = -0.02 dex (near-solar heavy-element abundance). From Earth, Kepler-1759 shines at apparent V-band magnitude 14.532 (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-1759 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,017 K |
| Stellar Radius | 0.7970 R☉ |
| Stellar Mass | 0.7600 M☉ |
| Bolometric Luminosity | 0.361 L☉ |
| Metallicity [Fe/H] | -0.020 dex |
| Stellar Age | 13.800 Gyr |
| Apparent Magnitude | V: 14.532 · G: 14.260 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.042900 AU |
| Orbital Period | 3.72 days |
| Mean Orbital Velocity | 125.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.6300° |
| Mean Bulk Density | 5.05 g/cm³ (9.7 km/s vesc) |
| Insolation Flux | 195.7000 S⊕ (~266,348 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1256.800 LY (385.348 pc) |