Kepler-282 e
Astrophysical Synthesis & Habitability Characterization
Kepler-282 e is a confirmed sub-neptune exoplanet orbiting the star Kepler-282, located approximately 4362.7 light-years (1337.61 parsecs) from the Solar System. First announced in 2013 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.102% across the stellar disk), this world measures 3.1 Earth radii (0.28 Jupiter radii) and has a measured mass of 56.2 Earth masses (0.18 Jupiter masses). Combining its mass and radius yields a mean bulk density of 10.4 g/cm³ (an iron-enriched, high-compression rocky core), a surface gravity of 5.85 g⊕ (57.37 m/s²), and an escape velocity of 47.6 km/s.
In its orbital architecture around Kepler-282, Kepler-282 e completes one full revolution every 44.347 Earth days at a semi-major axis of 0.23332 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 57.2 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 484 K (+211°C / +412°F) and receiving 24.11 S⊕ (~32,819 W/m²), Kepler-282 e orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-282 is classified as a stellar host with an effective photospheric temperature of 5,656 K, a radius of 0.89 R☉, a mass of 0.97 M☉, an estimated bolometric luminosity of 0.727 L☉. Stellar evolution modeling indicates an estimated stellar age of 12.88 Gyr and a metallicity of [Fe/H] = -0.2 dex (metal-poor relative to the Sun). From Earth, Kepler-282 shines at apparent V-band magnitude 15.444 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-282 system is a multi-planet architecture hosting 4 confirmed worlds, with Kepler-282 e sharing its stellar neighborhood alongside Kepler-282 b, Kepler-282 c, Kepler-282 d.
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-282 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,656 K |
| Stellar Radius | 0.8900 R☉ |
| Stellar Mass | 0.9700 M☉ |
| Bolometric Luminosity | 0.727 L☉ |
| Metallicity [Fe/H] | -0.200 dex |
| Stellar Age | 12.880 Gyr |
| Apparent Magnitude | V: 15.444 · G: 15.178 |
| System Architecture | 1 Star, 4 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.233320 AU |
| Orbital Period | 44.347 days |
| Mean Orbital Velocity | 57.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.7000° |
| Mean Bulk Density | 10.4 g/cm³ (47.6 km/s vesc) |
| Insolation Flux | 24.1140 S⊕ (~32,819 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4362.700 LY (1337.610 pc) |