Kepler-1397 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1397 b is a confirmed super-earth exoplanet orbiting the star Kepler-1397, located approximately 3908.2 light-years (1198.25 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0198% across the stellar disk), this world measures 1.72 Earth radii and has a measured mass of 3.61 Earth masses. Combining its mass and radius yields a mean bulk density of 3.91 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.22 g⊕ (11.96 m/s²), and an escape velocity of 16.2 km/s.
In its orbital architecture around Kepler-1397, Kepler-1397 b completes one full revolution every 47.45 Earth days at a semi-major axis of 0.25861 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 59.3 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 551 K (+278°C / +532°F) and receiving 58.10 S⊕ (~79,078 W/m²), Kepler-1397 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1397 is classified as a stellar host with an effective photospheric temperature of 6,026 K, a radius of 1.12 R☉, a mass of 1.09 M☉, an estimated bolometric luminosity of 1.484 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.55 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, Kepler-1397 shines at apparent V-band magnitude 14.324 (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-1397 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,026 K |
| Stellar Radius | 1.1200 R☉ |
| Stellar Mass | 1.0900 M☉ |
| Bolometric Luminosity | 1.484 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 3.550 Gyr |
| Apparent Magnitude | V: 14.324 · G: 14.091 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.258610 AU |
| Orbital Period | 47.45 days |
| Mean Orbital Velocity | 59.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.9700° |
| Mean Bulk Density | 3.91 g/cm³ (16.2 km/s vesc) |
| Insolation Flux | 58.1030 S⊕ (~79,078 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3908.200 LY (1198.250 pc) |