Kepler-1047 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1047 c is a confirmed terrestrial exoplanet orbiting the star Kepler-1047, located approximately 2666.8 light-years (817.65 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0065% across the stellar disk), this world measures 0.99 Earth radii and has a measured mass of 0.937 Earth masses. Combining its mass and radius yields a mean bulk density of 5.32 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.96 g⊕ (9.41 m/s²), and an escape velocity of 10.9 km/s.
In its orbital architecture around Kepler-1047, Kepler-1047 c completes one full revolution every 3.189 Earth days at a semi-major axis of 0.04413 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 150.5 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 1309 K (+1036°C / +1897°F) and receiving 1,323.07 S⊕ (~1,800,691 W/m²), Kepler-1047 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1047 is classified as a stellar host with an effective photospheric temperature of 5,754 K, a radius of 1.13 R☉, a mass of 1.08 M☉, an estimated bolometric luminosity of 1.256 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.47 Gyr and a metallicity of [Fe/H] = 0.29 dex (metal-rich relative to the Sun). From Earth, Kepler-1047 shines at apparent V-band magnitude 13.46 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1047 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1047 c sharing its stellar neighborhood alongside Kepler-1047 b.
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-1047 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,754 K |
| Stellar Radius | 1.1300 R☉ |
| Stellar Mass | 1.0800 M☉ |
| Bolometric Luminosity | 1.256 L☉ |
| Metallicity [Fe/H] | 0.290 dex |
| Stellar Age | 4.470 Gyr |
| Apparent Magnitude | V: 13.460 · G: 13.329 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.044130 AU |
| Orbital Period | 3.189 days |
| Mean Orbital Velocity | 150.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.0900° |
| Mean Bulk Density | 5.32 g/cm³ (10.9 km/s vesc) |
| Insolation Flux | 1323.0650 S⊕ (~1,800,691 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2666.800 LY (817.647 pc) |