OGLE-2005-BLG-390L b
Astrophysical Synthesis & Habitability Characterization
OGLE-2005-BLG-390L b is a confirmed sub-neptune exoplanet orbiting the star OGLE-2005-BLG-390L, located approximately 21526.3 light-years (6600 parsecs) from the Solar System. First announced in 2005 by OGLE using the Microlensing detection technique (detected via relativistic gravitational lensing of a background source star), this world measures 2.21 Earth radii and has a measured mass of 5.5 Earth masses. Combining its mass and radius yields a mean bulk density of 2.81 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.13 g⊕ (11.08 m/s²), and an escape velocity of 17.6 km/s.
In its orbital architecture around OGLE-2005-BLG-390L, OGLE-2005-BLG-390L b completes one full revolution every 3285 Earth days (8.99Julian years) at a semi-major axis of 2.6 AU (corresponding to the middle-system regime between Mars at 1.52 AU and Jupiter at 5.20 AU). Its mean orbital velocity is approximately 8.6 km/s (compared to Earth's 29.8 km/s).
❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 50 K (-223°C / -369°F), surface water and volatile species on OGLE-2005-BLG-390L b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.
The host star OGLE-2005-BLG-390L is classified as a stellar host with a mass of 0.22 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: OGLE · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | OGLE-2005-BLG-390L |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | — |
| Stellar Radius | — |
| Stellar Mass | 0.2200 M☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | — |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 2.600000 AU |
| Orbital Period | 3285 days |
| Mean Orbital Velocity | 8.6 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 2.81 g/cm³ (17.6 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 21526.300 LY (6600.000 pc) |