OGLE-TR-56 b
Astrophysical Synthesis & Habitability Characterization
OGLE-TR-56 b is a confirmed gas giant exoplanet orbiting the star OGLE-TR-56, located approximately 922.5 light-years (282.84 parsecs) from the Solar System. First announced in 2002 by OGLE using the Transit detection technique (producing an estimated primary transit depth of 1.056% across the stellar disk), this world measures 15.278 Earth radii (1.36 Jupiter radii) and has a measured mass of 441.77 Earth masses (1.39 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.68 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.89 g⊕ (18.53 m/s²), and an escape velocity of 60.2 km/s.
In its orbital architecture around OGLE-TR-56, OGLE-TR-56 b completes one full revolution every 1.212 Earth days at a semi-major axis of 0.02383 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 213.9 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.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2212 K (+1939°C / +3522°F) and receiving 3,942.32 S⊕ (~5,365,498 W/m²), OGLE-TR-56 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star OGLE-TR-56 is classified as a warm F-type star of spectral type F8 V with an effective photospheric temperature of 6,050 K, a radius of 1.363 R☉, a mass of 1.228 M☉, an estimated bolometric luminosity of 2.233 L☉. Stellar evolution modeling indicates an estimated stellar age of 3 Gyr and a metallicity of [Fe/H] = 0.25 dex (metal-rich relative to the Sun). From Earth, OGLE-TR-56 shines at apparent V-band magnitude 15.3 (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-56 |
| Spectral Type | F8 V |
| Effective Temp (Teff) | 6,050 K |
| Stellar Radius | 1.3630 R☉ |
| Stellar Mass | 1.2280 M☉ |
| Bolometric Luminosity | 2.233 L☉ |
| Metallicity [Fe/H] | 0.250 dex |
| Stellar Age | 3.000 Gyr |
| Apparent Magnitude | V: 15.300 · G: 16.093 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.023830 AU |
| Orbital Period | 1.212 days |
| Mean Orbital Velocity | 213.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 77.6000° |
| Mean Bulk Density | 0.68 g/cm³ (60.2 km/s vesc) |
| Insolation Flux | 3942.3204 S⊕ (~5,365,498 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 922.500 LY (282.839 pc) |