Kepler-154 e
Astrophysical Synthesis & Habitability Characterization
Kepler-154 e is a confirmed super-earth exoplanet orbiting the star Kepler-154, located approximately 2985 light-years (915.21 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0197% across the stellar disk), this world measures 1.5 Earth radii and has a measured mass of 2.86 Earth masses. Combining its mass and radius yields a mean bulk density of 4.67 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.27 g⊕ (12.45 m/s²), and an escape velocity of 15.4 km/s.
In its orbital architecture around Kepler-154, Kepler-154 e completes one full revolution every 3.933 Earth days at a semi-major axis of 0.04766 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 131.8 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 1140 K (+867°C / +1593°F) and receiving 480.41 S⊕ (~653,831 W/m²), Kepler-154 e orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-154 is classified as a stellar host with an effective photospheric temperature of 5,769 K, a radius of 0.98 R☉, a mass of 0.98 M☉, an estimated bolometric luminosity of 0.954 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.47 Gyr and a metallicity of [Fe/H] = -0.04 dex (near-solar heavy-element abundance). From Earth, Kepler-154 shines at apparent V-band magnitude 14.646 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-154 system is a multi-planet architecture hosting 5 confirmed worlds, with Kepler-154 e sharing its stellar neighborhood alongside Kepler-154 f, Kepler-154 d, Kepler-154 b, Kepler-154 c.
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-154 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,769 K |
| Stellar Radius | 0.9800 R☉ |
| Stellar Mass | 0.9800 M☉ |
| Bolometric Luminosity | 0.954 L☉ |
| Metallicity [Fe/H] | -0.040 dex |
| Stellar Age | 4.470 Gyr |
| Apparent Magnitude | V: 14.646 · G: 14.512 |
| System Architecture | 1 Star, 5 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.047660 AU |
| Orbital Period | 3.933 days |
| Mean Orbital Velocity | 131.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.8100° |
| Mean Bulk Density | 4.67 g/cm³ (15.4 km/s vesc) |
| Insolation Flux | 480.4050 S⊕ (~653,831 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2985.000 LY (915.212 pc) |