Kepler-282 c
Astrophysical Synthesis & Habitability Characterization
Kepler-282 c is a confirmed terrestrial exoplanet orbiting the star Kepler-282, located approximately 4362.7 light-years (1337.61 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0148% across the stellar disk), this world measures 1.2 Earth radii and has a measured mass of 1.87 Earth masses. Combining its mass and radius yields a mean bulk density of 5.97 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.3 g⊕ (12.75 m/s²), and an escape velocity of 14 km/s.
In its orbital architecture around Kepler-282, Kepler-282 c completes one full revolution every 13.639 Earth days at a semi-major axis of 0.106 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 84.6 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 717 K (+444°C / +831°F) and receiving 116.12 S⊕ (~158,035 W/m²), Kepler-282 c 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 5,602 K, a radius of 0.904 R☉, a mass of 0.86 M☉, an estimated bolometric luminosity of 0.722 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 c sharing its stellar neighborhood alongside Kepler-282 b, Kepler-282 d, Kepler-282 e.
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) | 5,602 K |
| Stellar Radius | 0.9040 R☉ |
| Stellar Mass | 0.8600 M☉ |
| Bolometric Luminosity | 0.722 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) | 0.106000 AU |
| Orbital Period | 13.639 days |
| Mean Orbital Velocity | 84.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.6900° |
| Mean Bulk Density | 5.97 g/cm³ (14 km/s vesc) |
| Insolation Flux | 116.1170 S⊕ (~158,035 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 4362.700 LY (1337.610 pc) |