KMT-2021-BLG-1391L b
Astrophysical Synthesis & Habitability Characterization
KMT-2021-BLG-1391L b is a confirmed super-earth exoplanet orbiting the star KMT-2021-BLG-1391L, located approximately 18656.1 light-years (5720 parsecs) from the Solar System. First announced in 2022 by KMTNet using the Microlensing detection technique (detected via relativistic gravitational lensing of a background source star), this world measures 1.97 Earth radii and has a measured mass of 4.55 Earth masses. Combining its mass and radius yields a mean bulk density of 3.28 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.17 g⊕ (11.47 m/s²), and an escape velocity of 17 km/s.
ℹ️ Thermal & Atmospheric Regime: Current photometric and spectroscopic constraints for KMT-2021-BLG-1391L b place it outside the conservative habitable zone definition pending further atmospheric characterization.
The host star KMT-2021-BLG-1391L is classified as a stellar host with a mass of 0.37 M☉.
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-2021-BLG-1391L |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | — |
| Stellar Radius | — |
| Stellar Mass | 0.3700 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | — |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.290000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.28 g/cm³ (17 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 18656.100 LY (5720.000 pc) |