Kepler-1038 c
Astrophysical Synthesis & Habitability Characterization
Kepler-1038 c is a confirmed super-earth exoplanet orbiting the star Kepler-1038, located approximately 1905.2 light-years (584.14 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.025% across the stellar disk), this world measures 1.416 Earth radii and has a measured mass of 2.59 Earth masses. Combining its mass and radius yields a mean bulk density of 5.03 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.29 g⊕ (12.65 m/s²), and an escape velocity of 15.1 km/s.
In its orbital architecture around Kepler-1038, Kepler-1038 c completes one full revolution every 7.128 Earth days at a semi-major axis of 0.0692 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 105.6 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 784 K (+511°C / +952°F) and receiving 89.24 S⊕ (~121,456 W/m²), Kepler-1038 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1038 is classified as a stellar host with an effective photospheric temperature of 5,159 K, a radius of 0.821 R☉, a mass of 0.868 M☉, an estimated bolometric luminosity of 0.428 L☉. Stellar evolution modeling indicates an estimated stellar age of 14 Gyr and a metallicity of [Fe/H] = 0.16 dex (metal-rich relative to the Sun). From Earth, Kepler-1038 shines at apparent V-band magnitude 15.03 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1038 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1038 c sharing its stellar neighborhood alongside Kepler-1038 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-1038 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,159 K |
| Stellar Radius | 0.8210 R☉ |
| Stellar Mass | 0.8680 M☉ |
| Bolometric Luminosity | 0.428 L☉ |
| Metallicity [Fe/H] | 0.160 dex |
| Stellar Age | 14.000 Gyr |
| Apparent Magnitude | V: 15.030 · G: 14.856 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.069200 AU |
| Orbital Period | 7.128 days |
| Mean Orbital Velocity | 105.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.6700° |
| Mean Bulk Density | 5.03 g/cm³ (15.1 km/s vesc) |
| Insolation Flux | 89.2400 S⊕ (~121,456 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1905.200 LY (584.136 pc) |