Kepler-1039 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1039 b is a confirmed super-earth exoplanet orbiting the star Kepler-1039, located approximately 1001 light-years (306.91 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0327% across the stellar disk), this world measures 1.46 Earth radii and has a measured mass of 2.73 Earth masses. Combining its mass and radius yields a mean bulk density of 4.84 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.28 g⊕ (12.55 m/s²), and an escape velocity of 15.3 km/s.
In its orbital architecture around Kepler-1039, Kepler-1039 b completes one full revolution every 0.935 Earth days at a semi-major axis of 0.01714 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 199.5 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 2080 K (+1807°C / +3285°F) and receiving 668.13 S⊕ (~909,322 W/m²), Kepler-1039 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1039 is classified as a stellar host with an effective photospheric temperature of 4,870 K, a radius of 0.74 R☉, a mass of 0.79 M☉, an estimated bolometric luminosity of 0.276 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.37 Gyr and a metallicity of [Fe/H] = 0.01 dex (near-solar heavy-element abundance). From Earth, Kepler-1039 shines at apparent V-band magnitude 14.438 (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-1039 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,870 K |
| Stellar Radius | 0.7400 R☉ |
| Stellar Mass | 0.7900 M☉ |
| Bolometric Luminosity | 0.276 L☉ |
| Metallicity [Fe/H] | 0.010 dex |
| Stellar Age | 4.370 Gyr |
| Apparent Magnitude | V: 14.438 · G: 14.096 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.017140 AU |
| Orbital Period | 0.935 days |
| Mean Orbital Velocity | 199.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 78.5400° |
| Mean Bulk Density | 4.84 g/cm³ (15.3 km/s vesc) |
| Insolation Flux | 668.1280 S⊕ (~909,322 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1001.000 LY (306.910 pc) |