Kepler-1589 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1589 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1589, located approximately 4935.2 light-years (1513.14 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 1.09 Earth radii and has a measured mass of 1.32 Earth masses. Combining its mass and radius yields a mean bulk density of 5.62 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.11 g⊕ (10.89 m/s²), and an escape velocity of 12.3 km/s.
In its orbital architecture around Kepler-1589, Kepler-1589 b completes one full revolution every 0.992 Earth days at a semi-major axis of 0.0205 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 224.9 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 2102 K (+1829°C / +3324°F) and receiving 5,228.79 S⊕ (~7,116,376 W/m²), Kepler-1589 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1589 is classified as a stellar host with an effective photospheric temperature of 6,166 K, a radius of 1.25 R☉, a mass of 1.18 M☉, an estimated bolometric luminosity of 2.026 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.75 Gyr and a metallicity of [Fe/H] = 0.08 dex (metal-rich relative to the Sun). From Earth, Kepler-1589 shines at apparent V-band magnitude 15.074 (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-1589 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,166 K |
| Stellar Radius | 1.2500 R☉ |
| Stellar Mass | 1.1800 M☉ |
| Bolometric Luminosity | 2.026 L☉ |
| Metallicity [Fe/H] | 0.080 dex |
| Stellar Age | 2.750 Gyr |
| Apparent Magnitude | V: 15.074 · G: 14.965 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.020500 AU |
| Orbital Period | 0.992 days |
| Mean Orbital Velocity | 224.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 71.4800° |
| Mean Bulk Density | 5.62 g/cm³ (12.3 km/s vesc) |
| Insolation Flux | 5228.7850 S⊕ (~7,116,376 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4935.200 LY (1513.140 pc) |