CoRoT-5 b
Astrophysical Synthesis & Habitability Characterization
CoRoT-5 b is a confirmed gas giant exoplanet orbiting the star CoRoT-5, located approximately 2878.2 light-years (882.47 parsecs) from the Solar System. First announced in 2009 by CoRoT using the Transit detection technique (producing an estimated primary transit depth of 1.4464% across the stellar disk), this world measures 15.558 Earth radii (1.39 Jupiter radii) and has a measured mass of 148.42 Earth masses (0.47 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.22 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.61 g⊕ (5.98 m/s²), and an escape velocity of 34.5 km/s.
In its orbital architecture around CoRoT-5, CoRoT-5 b completes one full revolution every 4.038 Earth days at a semi-major axis of 0.04947 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 133.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.09 carries the world between 0.045 AU at periapsis and 0.0539 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1438 K (+1165°C / +2129°F) and receiving 786.29 S⊕ (~1,070,147 W/m²), CoRoT-5 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star CoRoT-5 is classified as a warm F-type star of spectral type F9 V with an effective photospheric temperature of 6,100 K, a radius of 1.186 R☉, a mass of 1 M☉, an estimated bolometric luminosity of 1.747 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.9 Gyr and a metallicity of [Fe/H] = -0.25 dex (metal-poor relative to the Sun). From Earth, CoRoT-5 shines at apparent V-band magnitude 14.043 (faint and requiring research-grade or CCD telescopic photometry) in the Northern 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: CoRoT · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | CoRoT-5 |
| Spectral Type | F9 V |
| Effective Temp (Teff) | 6,100 K |
| Stellar Radius | 1.1860 R☉ |
| Stellar Mass | 1.0000 M☉ |
| Bolometric Luminosity | 1.747 L☉ |
| Metallicity [Fe/H] | -0.250 dex |
| Stellar Age | 6.900 Gyr |
| Apparent Magnitude | V: 14.043 · G: 13.902 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.049470 AU |
| Orbital Period | 4.038 days |
| Mean Orbital Velocity | 133.3 km/s |
| Orbital Eccentricity (e) | 0.09000 |
| Orbital Inclination (i) | 85.8300° |
| Mean Bulk Density | 0.22 g/cm³ (34.5 km/s vesc) |
| Insolation Flux | 786.2949 S⊕ (~1,070,147 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2878.200 LY (882.472 pc) |