Kepler-1027 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1027 b is a confirmed terrestrial exoplanet orbiting the star Kepler-1027, located approximately 1321.3 light-years (405.1 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0099% across the stellar disk), this world measures 0.89 Earth radii and has a measured mass of 0.64 Earth masses. Combining its mass and radius yields a mean bulk density of 5.01 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.81 g⊕ (7.94 m/s²), and an escape velocity of 9.5 km/s.
In its orbital architecture around Kepler-1027, Kepler-1027 b completes one full revolution every 1.908 Earth days at a semi-major axis of 0.02911 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 166 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 1268 K (+995°C / +1823°F) and receiving 1,162.51 S⊕ (~1,582,176 W/m²), Kepler-1027 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1027 is classified as a stellar host with an effective photospheric temperature of 5,436 K, a radius of 0.82 R☉, a mass of 0.91 M☉, an estimated bolometric luminosity of 0.527 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.41 Gyr and a metallicity of [Fe/H] = -0.06 dex (near-solar heavy-element abundance). From Earth, Kepler-1027 shines at apparent V-band magnitude 12.994 (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-1027 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,436 K |
| Stellar Radius | 0.8200 R☉ |
| Stellar Mass | 0.9100 M☉ |
| Bolometric Luminosity | 0.527 L☉ |
| Metallicity [Fe/H] | -0.060 dex |
| Stellar Age | 1.410 Gyr |
| Apparent Magnitude | V: 12.994 · G: 12.840 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.029110 AU |
| Orbital Period | 1.908 days |
| Mean Orbital Velocity | 166 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.7400° |
| Mean Bulk Density | 5.01 g/cm³ (9.5 km/s vesc) |
| Insolation Flux | 1162.5100 S⊕ (~1,582,176 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1321.300 LY (405.104 pc) |