Kepler-1802 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1802 b is a confirmed super-earth exoplanet orbiting the star Kepler-1802, located approximately 2076.6 light-years (636.69 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0578% across the stellar disk), this world measures 1.671 Earth radii and has a measured mass of 3.43 Earth masses. Combining its mass and radius yields a mean bulk density of 4.05 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.23 g⊕ (12.06 m/s²), and an escape velocity of 16 km/s.
In its orbital architecture around Kepler-1802, Kepler-1802 b completes one full revolution every 15.45 Earth days at a semi-major axis of 0.0662 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 46.6 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 581 K (+308°C / +586°F) and receiving 26.91 S⊕ (~36,625 W/m²), Kepler-1802 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1802 is classified as a stellar host with an effective photospheric temperature of 4,245 K, a radius of 0.637 R☉, a mass of 0.649 M☉, an estimated bolometric luminosity of 0.118 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.9 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, Kepler-1802 shines at apparent V-band magnitude 15.905 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The Kepler-1802 system is a multi-planet architecture hosting 2 confirmed worlds, with Kepler-1802 b sharing its stellar neighborhood alongside Kepler-1802 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-1802 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,245 K |
| Stellar Radius | 0.6370 R☉ |
| Stellar Mass | 0.6490 M☉ |
| Bolometric Luminosity | 0.118 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 13.900 Gyr |
| Apparent Magnitude | V: 15.905 · G: 16.505 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.066200 AU |
| Orbital Period | 15.45 days |
| Mean Orbital Velocity | 46.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 84.9700° |
| Mean Bulk Density | 4.05 g/cm³ (16 km/s vesc) |
| Insolation Flux | 26.9100 S⊕ (~36,625 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2076.600 LY (636.694 pc) |