Kepler-1702 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1702 b is a confirmed super-earth exoplanet orbiting the star Kepler-1702, located approximately 2795.6 light-years (857.14 parsecs) from the Solar System. First announced in 2020 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.041% across the stellar disk), this world measures 1.602 Earth radii and has a measured mass of 3.2 Earth masses. Combining its mass and radius yields a mean bulk density of 4.29 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.25 g⊕ (12.26 m/s²), and an escape velocity of 15.8 km/s.
In its orbital architecture around Kepler-1702, Kepler-1702 b completes one full revolution every 18.501 Earth days at a semi-major axis of 0.1275 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 75 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 555 K (+282°C / +540°F) and receiving 22.40 S⊕ (~30,486 W/m²), Kepler-1702 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1702 is classified as a stellar host with an effective photospheric temperature of 5,093 K, a radius of 0.7257 R☉, a mass of 0.85 M☉, an estimated bolometric luminosity of 0.318 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.24 dex (metal-poor relative to the Sun). From Earth, Kepler-1702 shines at apparent V-band magnitude 16.231 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
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-1702 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,093 K |
| Stellar Radius | 0.7257 R☉ |
| Stellar Mass | 0.8500 M☉ |
| Bolometric Luminosity | 0.318 L☉ |
| Metallicity [Fe/H] | -0.240 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 16.231 · G: 15.774 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.127500 AU |
| Orbital Period | 18.501 days |
| Mean Orbital Velocity | 75 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.7200° |
| Mean Bulk Density | 4.29 g/cm³ (15.8 km/s vesc) |
| Insolation Flux | 22.4000 S⊕ (~30,486 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2795.600 LY (857.140 pc) |