Kepler-1603 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1603 b is a confirmed super-earth exoplanet orbiting the star Kepler-1603, located approximately 8847.2 light-years (2712.58 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0082% across the stellar disk), this world measures 1.29 Earth radii and has a measured mass of 2.21 Earth masses. Combining its mass and radius yields a mean bulk density of 5.68 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.33 g⊕ (13.04 m/s²), and an escape velocity of 14.6 km/s.
In its orbital architecture around Kepler-1603, Kepler-1603 b completes one full revolution every 2.272 Earth days at a semi-major axis of 0.0351 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 168.1 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 1522 K (+1249°C / +2280°F) and receiving 1,269.46 S⊕ (~1,727,735 W/m²), Kepler-1603 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1603 is classified as a stellar host with an effective photospheric temperature of 6,241 K, a radius of 1.31 R☉, a mass of 1.21 M☉, an estimated bolometric luminosity of 2.336 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.82 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, Kepler-1603 shines at apparent V-band magnitude 15.397 (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-1603 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,241 K |
| Stellar Radius | 1.3100 R☉ |
| Stellar Mass | 1.2100 M☉ |
| Bolometric Luminosity | 2.336 L☉ |
| Metallicity [Fe/H] | 0.070 dex |
| Stellar Age | 2.820 Gyr |
| Apparent Magnitude | V: 15.397 · G: 15.340 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.035100 AU |
| Orbital Period | 2.272 days |
| Mean Orbital Velocity | 168.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.8700° |
| Mean Bulk Density | 5.68 g/cm³ (14.6 km/s vesc) |
| Insolation Flux | 1269.4600 S⊕ (~1,727,735 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 8847.200 LY (2712.580 pc) |