KMT-2022-BLG-1818L c
Astrophysical Synthesis & Habitability Characterization
KMT-2022-BLG-1818L c is a confirmed gas giant exoplanet orbiting the star KMT-2022-BLG-1818L, located approximately 17286.3 light-years (5300 parsecs) from the Solar System. First announced in 2026 by KMTNet using the Microlensing detection technique (detected via relativistic gravitational lensing of a background source star), this world measures 13.2 Earth radii (1.18 Jupiter radii) and has a measured mass of 114.418 Earth masses (0.36 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.27 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.66 g⊕ (6.47 m/s²), and an escape velocity of 32.9 km/s.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 13.200 R⊕, KMT-2022-BLG-1818L c exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star KMT-2022-BLG-1818L is classified as a stellar host with a mass of 0.79 M☉. The KMT-2022-BLG-1818L system is a multi-planet architecture hosting 2 confirmed worlds, with KMT-2022-BLG-1818L c sharing its stellar neighborhood alongside KMT-2022-BLG-1818L 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: KMTNet · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | KMT-2022-BLG-1818L |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | — |
| Stellar Radius | — |
| Stellar Mass | 0.7900 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | — |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 12.600000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.27 g/cm³ (32.9 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 17286.300 LY (5300.000 pc) |