Kepler-182 c
Astrophysical Synthesis & Habitability Characterization
Kepler-182 c is a confirmed sub-neptune exoplanet orbiting the star Kepler-182, located approximately 5052.4 light-years (1549.09 parsecs) from the Solar System. First announced in 2014 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0753% across the stellar disk), this world measures 3.43 Earth radii (0.31 Jupiter radii) and has a measured mass of 11.6 Earth masses. Combining its mass and radius yields a mean bulk density of 1.59 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.99 g⊕ (9.71 m/s²), and an escape velocity of 20.6 km/s.
In its orbital architecture around Kepler-182, Kepler-182 c completes one full revolution every 20.684 Earth days at a semi-major axis of 0.157 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 82.6 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 729 K (+456°C / +853°F) and receiving 88.85 S⊕ (~120,928 W/m²), Kepler-182 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-182 is classified as a stellar host with an effective photospheric temperature of 6,250 K, a radius of 1.146 R☉, a mass of 1.114 M☉, an estimated bolometric luminosity of 1.798 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.25 Gyr and a metallicity of [Fe/H] = 0.072 dex (metal-rich relative to the Sun). From Earth, Kepler-182 shines at apparent V-band magnitude 14.942 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-182 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-182 c sharing its stellar neighborhood alongside Kepler-182 b.
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-182 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,250 K |
| Stellar Radius | 1.1460 R☉ |
| Stellar Mass | 1.1140 M☉ |
| Bolometric Luminosity | 1.798 L☉ |
| Metallicity [Fe/H] | 0.072 dex |
| Stellar Age | 5.250 Gyr |
| Apparent Magnitude | V: 14.942 · G: 14.874 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.157000 AU |
| Orbital Period | 20.684 days |
| Mean Orbital Velocity | 82.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.7400° |
| Mean Bulk Density | 1.59 g/cm³ (20.6 km/s vesc) |
| Insolation Flux | 88.8520 S⊕ (~120,928 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 5052.400 LY (1549.090 pc) |