Kepler-1886 b
Astrophysical Synthesis & Habitability Characterization
Kepler-1886 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1886, located approximately 3455.7 light-years (1059.51 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.08% across the stellar disk), this world measures 2.582 Earth radii and has a measured mass of 7.18 Earth masses. Combining its mass and radius yields a mean bulk density of 2.3 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.08 g⊕ (10.59 m/s²), and an escape velocity of 18.7 km/s.
In its orbital architecture around Kepler-1886, Kepler-1886 b completes one full revolution every 24.276 Earth days at a semi-major axis of 0.16 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 71.7 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 580 K (+307°C / +585°F) and receiving 26.68 S⊕ (~36,311 W/m²), Kepler-1886 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Kepler-1886 is classified as a stellar host with an effective photospheric temperature of 5,745 K, a radius of 0.837 R☉, a mass of 0.928 M☉, an estimated bolometric luminosity of 0.685 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.2 dex (metal-poor relative to the Sun). From Earth, Kepler-1886 shines at apparent V-band magnitude 15.627 (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-1886 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,745 K |
| Stellar Radius | 0.8370 R☉ |
| Stellar Mass | 0.9280 M☉ |
| Bolometric Luminosity | 0.685 L☉ |
| Metallicity [Fe/H] | -0.200 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 15.627 · G: 15.456 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.160000 AU |
| Orbital Period | 24.276 days |
| Mean Orbital Velocity | 71.7 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.3200° |
| Mean Bulk Density | 2.3 g/cm³ (18.7 km/s vesc) |
| Insolation Flux | 26.6800 S⊕ (~36,311 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3455.700 LY (1059.510 pc) |