Kepler-997 b
Astrophysical Synthesis & Habitability Characterization
Kepler-997 b is a confirmed super-earth exoplanet orbiting the star Kepler-997, located approximately 1525 light-years (467.57 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0064% across the stellar disk), this world measures 1.36 Earth radii and has a measured mass of 2.42 Earth masses. Combining its mass and radius yields a mean bulk density of 5.3 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.31 g⊕ (12.85 m/s²), and an escape velocity of 14.9 km/s.
In its orbital architecture around Kepler-997, Kepler-997 b completes one full revolution every 2.707 Earth days at a semi-major axis of 0.04022 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 161.6 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 1709 K (+1436°C / +2617°F) and receiving 1,900.13 S⊕ (~2,586,078 W/m²), Kepler-997 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-997 is classified as a stellar host with an effective photospheric temperature of 6,150 K, a radius of 1.56 R☉, a mass of 1.22 M☉, an estimated bolometric luminosity of 3.123 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.63 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, Kepler-997 shines at apparent V-band magnitude 11.521 (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-997 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,150 K |
| Stellar Radius | 1.5600 R☉ |
| Stellar Mass | 1.2200 M☉ |
| Bolometric Luminosity | 3.123 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 3.630 Gyr |
| Apparent Magnitude | V: 11.521 · G: 11.848 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040220 AU |
| Orbital Period | 2.707 days |
| Mean Orbital Velocity | 161.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9300° |
| Mean Bulk Density | 5.3 g/cm³ (14.9 km/s vesc) |
| Insolation Flux | 1900.1310 S⊕ (~2,586,078 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1525.000 LY (467.568 pc) |