OGLE-TR-111 b
Astrophysical Synthesis & Habitability Characterization
OGLE-TR-111 b is a confirmed gas giant exoplanet orbiting the star OGLE-TR-111, located approximately 3484.4 light-years (1068.33 parsecs) from the Solar System. First announced in 2004 by OGLE using the Transit detection technique (producing an estimated primary transit depth of 1.5917% across the stellar disk), this world measures 11.422 Earth radii (1.02 Jupiter radii) and has a measured mass of 174.799 Earth masses (0.55 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.65 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.34 g⊕ (13.14 m/s²), and an escape velocity of 43.8 km/s.
In its orbital architecture around OGLE-TR-111, OGLE-TR-111 b completes one full revolution every 4.014 Earth days at a semi-major axis of 0.0473 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 128.2 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 1019 K (+746°C / +1375°F) and receiving 204.95 S⊕ (~278,941 W/m²), OGLE-TR-111 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star OGLE-TR-111 is classified as an orange K-type star of spectral type K2 V with an effective photospheric temperature of 5,040 K, a radius of 0.83 R☉, a mass of 0.82 M☉, an estimated bolometric luminosity of 0.399 L☉. Stellar evolution modeling indicates an estimated stellar age of 8.8 Gyr and a metallicity of [Fe/H] = 0.19 dex (metal-rich relative to the Sun). From Earth, OGLE-TR-111 shines at apparent V-band magnitude 16.707 (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-TR-111 |
| Spectral Type | K2 V |
| Effective Temp (Teff) | 5,040 K |
| Stellar Radius | 0.8300 R☉ |
| Stellar Mass | 0.8200 M☉ |
| Bolometric Luminosity | 0.399 L☉ |
| Metallicity [Fe/H] | 0.190 dex |
| Stellar Age | 8.800 Gyr |
| Apparent Magnitude | V: 16.707 · G: 16.528 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.047300 AU |
| Orbital Period | 4.014 days |
| Mean Orbital Velocity | 128.2 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.3000° |
| Mean Bulk Density | 0.65 g/cm³ (43.8 km/s vesc) |
| Insolation Flux | 204.9529 S⊕ (~278,941 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3484.400 LY (1068.330 pc) |