OGLE-2018-BLG-0740L b
Astrophysical Synthesis & Habitability Characterization
OGLE-2018-BLG-0740L b is a confirmed gas giant exoplanet orbiting the star OGLE-2018-BLG-0740L, located approximately 10437 light-years (3200 parsecs) from the Solar System. First announced in 2019 by OGLE using the Microlensing detection technique (detected via relativistic gravitational lensing of a background source star), this world measures 12.9 Earth radii (1.15 Jupiter radii) and has a measured mass of 1500 Earth masses (4.72 Jupiter masses). Combining its mass and radius yields a mean bulk density of 3.85 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 9.01 g⊕ (88.36 m/s²), and an escape velocity of 120.6 km/s.
In its orbital architecture around OGLE-2018-BLG-0740L, OGLE-2018-BLG-0740L b completes one full revolution every 5480 Earth days (15Julian years) at a semi-major axis of 5 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 9.9 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.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.900 R⊕, OGLE-2018-BLG-0740L b 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 OGLE-2018-BLG-0740L is classified as a solar-type yellow star of spectral type G V with an effective photospheric temperature of 5,912 K, a mass of 1 M☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.24 dex (metal-poor relative to the Sun). From Earth, OGLE-2018-BLG-0740L shines at apparent V-band magnitude 18.21 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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: OGLE · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | OGLE-2018-BLG-0740L |
| Spectral Type | G V |
| Effective Temp (Teff) | 5,912 K |
| Stellar Radius | — |
| Stellar Mass | 1.0000 M☉ |
| Metallicity [Fe/H] | -0.240 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 18.210 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 5.000000 AU |
| Orbital Period | 5480 days |
| Mean Orbital Velocity | 9.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 3.85 g/cm³ (120.6 km/s vesc) |
| Insolation Flux | — |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 10437.000 LY (3200.000 pc) |