Qatar-7 b
Astrophysical Synthesis & Habitability Characterization
Qatar-7 b is a confirmed gas giant exoplanet orbiting the star Qatar-7, located approximately 2302.6 light-years (705.98 parsecs) from the Solar System. First announced in 2019 by Qatar using the Transit detection technique (producing an estimated primary transit depth of 1.2476% across the stellar disk), this world measures 19.055 Earth radii (1.7 Jupiter radii) and has a measured mass of 597.52 Earth masses (1.88 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.48 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.65 g⊕ (16.18 m/s²), and an escape velocity of 62.6 km/s.
In its orbital architecture around Qatar-7, Qatar-7 b completes one full revolution every 2.032 Earth days at a semi-major axis of 0.0352 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 188.5 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 2053 K (+1780°C / +3236°F) and receiving 2,886.29 S⊕ (~3,928,244 W/m²), Qatar-7 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star Qatar-7 is classified as a warm F-type star of spectral type F4 V with an effective photospheric temperature of 6,387 K, a radius of 1.564 R☉, a mass of 1.409 M☉, an estimated bolometric luminosity of 3.652 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.69 Gyr and a metallicity of [Fe/H] = 0.276 dex (metal-rich relative to the Sun). From Earth, Qatar-7 shines at apparent V-band magnitude 13.134 (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: Qatar · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | Qatar-7 |
| Spectral Type | F4 V |
| Effective Temp (Teff) | 6,387 K |
| Stellar Radius | 1.5640 R☉ |
| Stellar Mass | 1.4090 M☉ |
| Bolometric Luminosity | 3.652 L☉ |
| Metallicity [Fe/H] | 0.276 dex |
| Stellar Age | 1.690 Gyr |
| Apparent Magnitude | V: 13.134 · G: 12.928 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.035200 AU |
| Orbital Period | 2.032 days |
| Mean Orbital Velocity | 188.5 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.0000° |
| Mean Bulk Density | 0.48 g/cm³ (62.6 km/s vesc) |
| Insolation Flux | 2886.2922 S⊕ (~3,928,244 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2302.600 LY (705.981 pc) |