CoRoT-17 b
Astrophysical Synthesis & Habitability Characterization
CoRoT-17 b is a confirmed gas giant exoplanet orbiting the star CoRoT-17, located approximately 3836 light-years (1176.12 parsecs) from the Solar System. First announced in 2011 by CoRoT using the Transit detection technique (producing an estimated primary transit depth of 0.4343% across the stellar disk), this world measures 11.43 Earth radii (1.02 Jupiter radii) and has a measured mass of 772.29 Earth masses (2.43 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.85 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 5.91 g⊕ (57.96 m/s²), and an escape velocity of 91.9 km/s.
In its orbital architecture around CoRoT-17, CoRoT-17 b completes one full revolution every 3.768 Earth days at a semi-major axis of 0.0461 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 133.1 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 1626 K (+1353°C / +2467°F) and receiving 640.92 S⊕ (~872,296 W/m²), CoRoT-17 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star CoRoT-17 is classified as a solar-type yellow star of spectral type G2 V with an effective photospheric temperature of 5,740 K, a radius of 1.59 R☉, a mass of 1.04 M☉, an estimated bolometric luminosity of 2.462 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.7 Gyr and a metallicity of [Fe/H] = 0 dex (near-solar heavy-element abundance). From Earth, CoRoT-17 shines at apparent V-band magnitude 16.29 (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: CoRoT · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | CoRoT-17 |
| Spectral Type | G2 V |
| Effective Temp (Teff) | 5,740 K |
| Stellar Radius | 1.5900 R☉ |
| Stellar Mass | 1.0400 M☉ |
| Bolometric Luminosity | 2.462 L☉ |
| Metallicity [Fe/H] | 0.000 dex |
| Stellar Age | 10.700 Gyr |
| Apparent Magnitude | V: 16.290 · G: 15.437 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.046100 AU |
| Orbital Period | 3.768 days |
| Mean Orbital Velocity | 133.1 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.3400° |
| Mean Bulk Density | 2.85 g/cm³ (91.9 km/s vesc) |
| Insolation Flux | 640.9232 S⊕ (~872,296 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 3836.000 LY (1176.120 pc) |