OGLE-TR-113 b
Astrophysical Synthesis & Habitability Characterization
OGLE-TR-113 b is a confirmed gas giant exoplanet orbiting the star OGLE-TR-113, located approximately 1847.5 light-years (566.46 parsecs) from the Solar System. First announced in 2004 by OGLE using the Transit detection technique (producing an estimated primary transit depth of 2.1057% across the stellar disk), this world measures 12.251 Earth radii (1.09 Jupiter radii) and has a measured mass of 400.449 Earth masses (1.26 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.2 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.67 g⊕ (26.18 m/s²), and an escape velocity of 64 km/s.
In its orbital architecture around OGLE-TR-113, OGLE-TR-113 b completes one full revolution every 1.432 Earth days at a semi-major axis of 0.02289 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 173.8 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 1342 K (+1069°C / +1956°F) and receiving 528.41 S⊕ (~719,172 W/m²), OGLE-TR-113 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star OGLE-TR-113 is classified as an orange K-type star of spectral type K4 V with an effective photospheric temperature of 4,790 K, a radius of 0.774 R☉, a mass of 0.779 M☉, an estimated bolometric luminosity of 0.283 L☉. Stellar evolution modeling indicates an estimated stellar age of 13.2 Gyr and a metallicity of [Fe/H] = 0.09 dex (metal-rich relative to the Sun). From Earth, OGLE-TR-113 shines at apparent V-band magnitude 15.849 (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-113 |
| Spectral Type | K4 V |
| Effective Temp (Teff) | 4,790 K |
| Stellar Radius | 0.7740 R☉ |
| Stellar Mass | 0.7790 M☉ |
| Bolometric Luminosity | 0.283 L☉ |
| Metallicity [Fe/H] | 0.090 dex |
| Stellar Age | 13.200 Gyr |
| Apparent Magnitude | V: 15.849 · G: 15.443 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.022890 AU |
| Orbital Period | 1.432 days |
| Mean Orbital Velocity | 173.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 87.8000° |
| Mean Bulk Density | 1.2 g/cm³ (64 km/s vesc) |
| Insolation Flux | 528.4147 S⊕ (~719,172 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1847.500 LY (566.459 pc) |